Patent Publication Number: US-2021162220-A1

Title: Electrical Connection For A Hermetic Terminal For An Active Implantable Medical Device Utilizing A Ferrule Pocket

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation-in-part of U.S. application Ser. No. 16/360,372, filed on Mar. 21, 2019, now U.S. Pat. No. 10,912,945, which is a continuation-in-part of U.S. application Ser. No. 16/121,716, filed on Sep. 5, 2018, now U.S. Pat. No. 10,596,369, which is a continuation of U.S. application Ser. No. 15/943,998, filed on Apr. 3, 2018, now U.S. Pat. No. 10,350,421, which claims priority to U.S. provisional application Ser. No. 62/646,552, filed on Mar. 22, 2018, the contents of which are fully incorporated herein by reference. 
    
    
     FIELD OF THE INVENTION 
     The present invention generally relates to active implantable medical devices and connections for a hermetic terminal for an active implantable medical device (AIMD). More particularly, the present invention relates to a connection structure for electrically and/or mechanically connecting components and subassemblies to a recessed pocket formed in the ferrule of a hermetic terminal for an active implantable medical device, the recessed pocket comprising a pocket-pad nested therein. The pocket-pad preferably provides an oxide-resistant electrical connection from the ferrule to an AIMD electronic component or circuit, such as an EMI filter capacitor, an EMI filter circuit board or an AIMD circuit board. 
     BACKGROUND OF THE INVENTION 
       FIG. 1  illustrates various types of active implantable and external medical devices  100  that are currently in use. The word “active” means that the implantable medical device has at least one electronic circuit and an energy source such as a primary battery, a secondary battery, a wireless energy source or a connected energy source.  FIG. 1  is a wire formed diagram of a generic human body showing a number of implanted medical devices. These are examples of AIMDs and do not include all AIMDs, hence are not intended to limit the scope of the invention.  100 A is a family of external and implantable hearing devices which can include the group of hearing aids, cochlear implants, piezoelectric sound bridge transducers and the like.  100 B includes an entire variety of neurostimulators and brain stimulators. Neurostimulators are used to stimulate the Vagus nerve, for example, to treat epilepsy, obesity and depression. Brain stimulators are similar to a pacemaker-like device and include electrodes implanted deep into the brain for sensing the onset of a seizure and also providing electrical stimulation to brain tissue to prevent the seizure from actually happening. The leadwires that come from a deep brain stimulator are often placed using real time imaging. Most commonly such leadwires are placed during real time MRI.  100 C shows a cardiac pacemaker, which is well-known in the art, and which may have endocardial or epicardial leads. Implantable pacemakers may also be leadless. The family of cardiac pacemakers  100 C includes the cardiac resynchronization therapy devices (CRT-D pacemakers) and leadless pacemakers. CRT-D pacemakers are unique in that they provide electrical stimulation therapy to pace both the right and the left sides of the heart. The family also includes all types of implantable loop recorders or biologic monitors, such as cardiac monitors. Referring once again to element  100 C, the cardiac pacemaker could also be any type of biologic monitoring and/or data recording device, including loop recorders or the like.  100 D includes the family of left ventricular assist devices (LVADs) and artificial hearts.  100 E includes an entire family of drug pumps which can be used for dispensing of insulin, chemotherapy drugs, pain medications and the like. Insulin pumps are evolving from passive devices to ones that have sensors and closed loop systems, which permit real time monitoring of blood sugar levels. These devices tend to be more sensitive to EMI than passive pumps that have no sense circuitry or externally implanted leadwires.  100 F includes a variety of external or implantable bone growth stimulators for rapid healing of fractures.  100 G includes urinary incontinence devices.  100 H includes the family of pain relief spinal cord stimulators and anti-tremor stimulators.  100 H also includes an entire family of other types of neurostimulators used to block pain.  100 I includes a family of implantable cardioverter defibrillator (ICD) devices and also includes the family of congestive heart failure devices (CHF). CHF devices are also known in the art as cardio resynchronization therapy devices or CRT devices. Although  100 I is described as an implantable defibrillator, it is noted that, like pacemakers, these implantable cardioverter defibrillators can have either endocardial or epicardial leads. Additionally, implantable defibrillators also includes a new family of subcutaneous defibrillators. As used herein, ICDs include subcutaneous defibrillators, CHF, CRT and CRT-D devices. CRT devices of the ICD family are cardiac resynchronization therapy devices that not only provides electrical stimulation therapy to pace the heart but is also capable of providing high-voltage defibrillation therapy when required.  100 J illustrates an externally worn pack. This pack could be an external insulin pump, an external drug pump, an external neurostimulator, a Holter monitor with skin electrodes or even a ventricular assist device power pack. As used herein, the term AIMD includes any device implanted in the human body that has at least one electronic component. 
       FIG. 2  illustrates a side view of prior art cardiac pacemaker  100 C. The pacemaker electronics are housed in a hermetically sealed and conductive electromagnetic shield  116  (typically titanium). There is a header block assembly  101  generally made of thermal-setting non-conductive plastic, such as Tecothane®. This header block assembly  101  houses one or more connector assemblies generally in accordance with ISO Standards IS-1, IS-2, or more modern standards, such as IS4 or DF4. These header block connector port assemblies are shown as  103  and  103 ′. Implantable leadwires  107 ,  107 ′ have proximal plugs  105 ,  105 ′ and are designed to insert into and mate with these header block connector cavities  103  and  103 ′, or, in devices that do not have header block assemblies, are built directly into the pulse generator itself. 
     As used herein, the term “lead” refers to an implantable lead containing a lead body and one or more internal lead conductors. A “lead conductor” refers to the conductor that is inside of an implanted lead body. The term “leadwire” or “lead wire” refers to wiring that is either inside of the active implantable medical device (AIMD) housing or inside of the AIMD header block assembly or both. Furthermore, as used herein, in general, the terms lead, leadwire and pin are all used interchangeably. Importantly, they are all electrical conductors. This is why, in the broad sense of the term, lead, leadwire or pin can all be used interchangeably since they are all conductors. The term “conductive pathway” can also be used to be synonymous with lead conductor, lead, leadwire or pin or even a circuit trace. As described herein, composite conductive sintered paste filled vias passing through an insulator in nonconductive relation with a ferrule electrically acts the same as a leadwire, lead wire, or pin. These sintered paste filled vias (conductive pathway) may also incorporate co-fired solid leadwires (conductive pathway). As used herein, the term paste generally refers to pastes, inks, gels, paints, cermets, and other such metal and/or metal/ceramic sinterable material combinations that can be flowable, injectable, pressed, pulled, pushed or otherwise movable into an orifice or via. Post-sintering, the solvents and binders are baked out and, after sintering, the paste becomes a densified solid with monolithic structure. For example, see  FIGS. 44A-46  herein. 
     Referring now back to  FIG. 2 , one will appreciate that the active implantable medical device  100 C, in this case, would be a cardiac pacemaker, an implantable cardioverter defibrillator (ICD) or a cardiac resynchronization device, such as cardiac resynchronization pacemakers (CRT-P) or cardiac resynchronization defibrillators (CRT-D) devices. It will be further appreciated that the pulse generator  100 C illustrated in  FIG. 2 , could be various types of neurostimulators, which may or may not have a Tecothane® header block, as illustrated. Some neurostimulators have their own plugs and connectors and others, such as cochlear implants, may be directly wired from the active implantable medical device or pulse generator (PG), for example, to the cochlear nerve bundle. 
     Additionally, AIMD, as defined herein, includes electronic circuits disposed within the human body that have a primary or secondary battery, or have an alternative energy source, such as energy induced by motion, thermal or chemical effects or through external induction. As used herein, the term “header block” is the biocompatible material that attaches between the AIMD housing and the lead. The term “header block connector assembly” refers to the header block including the connector ports for the leads and the wiring connecting the lead connector ports to the hermetic terminal subassemblies which allow electrical connections to hermetically pass inside the device housing. It is also understood by those skilled in the art that the present invention can be applicable to active implantable medical devices that do not have a header block or header block connector assemblies such as pulse generators. Referring once again to  FIG. 2 , one can see that EMI (or electromagnetic interference) is showing undesirably coupling to implanted leads  107  and  107 ′. Electromagnetic interference is very common in a patient environment and includes signals from cellular telephones, microwave ovens, airport radars and the like. 
       FIG. 2A  shows the wire man of  FIG. 1  (a human patient) with an implanted active implantable medical device  100 C and implanted leadwires  107 , as shown. The patient, in this case, is holding a cellular telephone, which is producing a very strong radio frequency (RF) field. One can see that as this field propagates, it cuts across the implanted leadwires  107  where this electromagnetic interference energy (RF), otherwise known as EMI, is couple onto the leads. 
     The generally titanium conductive housing  116  of the AIMD forms an electromagnetic shield and protects internal electronics from radiated interference. Once electromagnetic interference is coupled to leadwires, it can be undesirably conductively coupled through the header block  101  and through the hermetic terminal feedthrough assembly  120  to device electronics, such as those indicated by device circuit board  122 . In the prior art, it is very common that a feedthrough filter capacitor  132  be disposed at the point of leadwire entry into the shielded housing  116 . The purpose of the feedthrough is to decouple the unwanted high frequency electromagnetic interference and divert it harmlessly to the overall electromagnetic shield  116 . In this way, the conductive EMI cannot reach the sensitive AIMD electronic circuits. For example, in a cardiac pacemaker, electromagnetic interference can be interpreted by the device electronics as a normal heartbeat and thereby, cause the pacemaker to inhibit. This means that the pacing pulses would cease, which would become immediately life-threatening for a pacemaker dependent patient. 
       FIG. 3  illustrates a prior art unipolar feedthrough capacitor  132 . A quadpolar feedthrough capacitor  132  was previously illustrated in prior art  FIG. 2 . However now referring back to  FIG. 3 , one can see that there is an external metallization  142  and a passageway or feedthrough hole metallization  144 . This metallization can be applied by electroplating or by applying a metal flitted glass, which is then fired. In one embodiment, the fritted glass may comprise a silver or palladium silver glass matrix. In any event, after application of the metallization layers  142  and  144 , one can make electrical contact to the feedthrough capacitor either by soldering or using thermal-setting conductive adhesives or the like. As shown, the feedthrough capacitor comprises active electrode plates  148  and ground electrode plates  146 . The reason the electrode plates  146  are called ground electrode plates and as will be further explained herein, is because the perimeter or outside diameter metallization  142  is configured to be attached to a ferrule  112  and in turn, to the conductive housing  116  of an AIMD, which forms an equipotential surface for energy dissipation (aka ground). Referring once again to  FIG. 2 , one can see that the housing  116 , for an active implantable medical device, is generally metallic (titanium). One can also see that the feedthrough capacitor  132  is attached to a heimetically sealed subassembly  120  of the AIMD, which acts as an equipotential surface (ground). 
       FIG. 3A  is taken generally from section  3 A- 3 A from  FIG. 3 . Shown in exploded view, are ceramic cover sheets  147 , active electrodes  148  that are disposed on ceramic layers  149  and ground electrode plates  146  that are disposed on ceramic layers  149 . These are stacked up with cover sheets on the opposite end  147  and then pressed and laminated. It will be appreciated that blank cover sheets  147  can be disposed between the active layers  148  and the ground layers  146  thereby, increasing the dielectric thickness and increasing the voltage rating of the device. The electrode layers  148  and  146  are typically applied by silk-screening or equivalent waterfall processes. 
       FIG. 4  is a cross-sectional view showing the unipolar capacitor  132  of  FIG. 3  mounted to a ferrule  112  of a hermetic seal subassembly  120  for an AIMD. As can be seen, the ground metallization  142  of the feedthrough capacitor  132  is electrically connected  152  to the ferrule  112  of the hermetic seal. The hermetic seal is accomplished generally by gold brazing  162  between an alumina insulator  160 . There is an outside diameter gold braze  150  between the insulator and the ferrule  112 . There is also a gold braze  162  between leadwires  114 ,  111  and the inside diameter of an insulator  160  passageway as illustrated. In order for gold braze material  150 ,  162  to wet to the insulator surfaces  160 , there must first be an adhesion layer  153  and then a wetting layer  151 , as illustrated. In one embodiment, the adhesion layer can be a sputtered layer of titanium, followed by a sputtered layer of molybdenum or niobium (the wetting layer). In some manufacturing agent operations, the adhesion and wetting layers can be combined into a single layer. Throughout the present invention, sometimes in order to simplify the drawings, the adhesion layer  153  and wetting layer  151  are not shown or at least not described. But it will be understood that anywhere that a gold braze  150 ,  162  is described herein to an insulator  160 , that an adhesion/wetting layer is required. 
     Referring once again to  FIG. 4 , shown is a prior art unipolar discoidal. In the case where this unipolar discoidal was intended for use in an AIMD known as an implantable cardioverter defibrillator, this would mean that the capacitor  132  would have to handle high-voltage pulses when the implantable defibrillator delivers its high-voltage cardioversion shock to heart tissues. When the high-voltage wave front travels to the heart, the feedthrough capacitor  132 , which is sitting there uncharged, must suddenly charge up to the full defibrillator pulse voltage, which can be on the order of 700 to 850 volts. Studies by the inventors have shown that this voltage can conductively ring up to as high as 1200 volts. Looking carefully at the unipolar capacitor  132  of  FIG. 4 , one can see that there is a ground electrode plate  146  oriented on the bottom of the unipolar feedthrough capacitor towards the AIMD electronics and that on the top of the feedthrough capacitor, there is a second ground electrode plate  146  disposed towards the body fluid side. In other words, the side of the capacitor that is mounted to at least one of the ferrule  112  and the insulator  160 . These upper and lower ground electrode plates can also be seen in the partial section of  FIG. 3 . One can see that there is a ground electrode plate connected to the capacitor&#39;s diameter metallization  142 , which is its ground metallization, which is connected to the ferrule. Again, there is a ground electrode plate  146  oriented up and down. When one performs equipotential high-voltage modeling of the stresses both inside and outside the capacitor, having a ground electrode plate disposed both upwardly and downwardly constrains the high-voltage fields to the inside of the capacitor. This prevents high-voltage fields from occurring between the bottom of the capacitor and the conductive ferrule  112  or, on the top of the capacitors to other structures inside of the AIMD, such as a circuit board or a battery housing or any of the other conductive objects. Accordingly, there is an advantage to having a ground plate up and a ground plate down to manage the electric fields in and around a feedthrough capacitor. 
     As defined herein, what is referred to as the insulator is generally disposed between or inside a ferrule opening and has either lead conductors or conductive passageways or vias that pass through the hermetic terminal subassembly  120 . The ceramic capacitor  132  also uses insulative materials, which are dielectrics. As previously described in  FIG. 3A , these dielectric sheets  147 , 149  are referred to as dielectrics although it is appreciated that they are also insulative. In summary, as used herein, insulators are the insulators that are gold brazed to a ferrule of the AIMD, whereas capacitor dielectric insulators are referred to as dielectric layers. Referring once again to  FIG. 4 , it will also be appreciated that instead of alumina insulator with corresponding gold brazes  150  and  162 , the hermetic seal insulator could comprise other ceramics in combination with or instead of alumina, for example, but not limited to, zirconia, sapphire, aluminum nitride, alumina toughened zirconia, boron nitride, ceramic-on-ceramic, partially stabilized zirconia, strontium aluminate, yttria-stabilized zirconia, zirconia toughened alumina, zirconia toughened ceramics, celsian (BaAl 2 Si 2 O 8 ), among others; glass, for example, but not limited to, borosilicate sealing glasses, such as Corning 7052, 7070 or RSG4, Schott 8250, Fusite K glasses, compression sealing glasses, such as Schott 8061, Fusite A485, Richland RG93, Osram SG36 or Nipro WG6, and Cabal or TA23 glasses, among others; or glass ceramics, such as, but not limited to, the Li 2 O×Al 2 O 3 ×nSiO 2  glass-ceramic system (LAS system), the MgO×Al 2 O 3 ×nSiO 2  glass-ceramic system (MAS system), the ZnO×Al 2 O 3 ×nSiO 2  glass-ceramic system (ZAS system), ceramic matrix composite glass-ceramic systems Elan 46 LAS glass-ceramic family or the Kryoflex multiple-phase derivative of ceramic oxide crystalline silicates, all of which could either be brazed, directly fused to the corresponding ferrule  42  and leadwire  111  thereby, eliminating the need for gold brazes, forming either a matched or a compression hermetic seal. Throughout the drawings showing in the patent, it will be appreciated that hermetic seal insulators could be replaced by glass or glass ceramic insulators. The insulator  160  partially resides inside of a hole that passes through the ferrule  112 . This is from a body fluid side to the device side, as shown. It will be appreciated that the insulator  160  need not be disposed inside of a ferrule opening. Instead, the insulator  160  could be disposed on top of the ferrule and gold braze  150  could connect the insulator  160  to the top ferrule surface  112 . 
     Referring once again to  FIG. 4 , one can see that the ferrule  112  of the hermetic seal has been laser welded  154  into the overall housing  116  of the AIMD. This is very important in that the feedthrough capacitor ground metallization  142  becomes part of the overall electromagnetic shield of the AIMD housing. This forms in the industry what is known as a Faraday cage and provides an effective electromagnetic interference shield and energy dissipating surface. Referring back to  FIG. 4 , lead  114  on the body fluid side is generally connected to implanted leadwires and tissue stimulating electrodes (not shown). Referring back to  FIG. 2  for a prior art pacemaker, one can see these leadwires  107  and  107 ′ that are connected to electrodes  109  that are located within the human heart. Again, referring to  FIGS. 2 and 2A , undesirably, electromagnetic interference (EMI) can be coupled to these implanted leads and in turn, to the interior of the AIMD housing. It has been shown in numerous articles that EMI can disrupt the proper operation of the AIMD, such as a cardiac pacemaker and lead to improper therapy or even complete inhibition of therapy. Inhibition of therapy, for a cardiac pacemaker, can be immediately life-threatening to a pacemaker dependent patient. 
     Referring once again to  FIG. 4 , electromagnetic interference signals therefore, may be conducted along leadwire  114  to terminal  1  of the feedthrough capacitor. It is the purpose of the feedthrough capacitor  132  to divert unwanted high-frequency EMI signals from the leadwire  114 ,  111  so that by the time the signals reach terminal  2  (the AIMD electronics or device side), that the electromagnetic interference has been greatly attenuated or diverted through the feedthrough capacitor, harmlessly to the AIMD housing  116 . Referring back to  FIG. 4 , one will appreciate that the leadwire coming from the body fluid side  114  passes through the insulator  160  and the feedthrough capacitor  132 . The leadwire is a continuous conductor but is labeled  111  on the device side. In other words, the leadwire has a body fluid portion  114  and a device side portion  111 . 
     This is further appreciated by looking at the schematic diagram of  FIG. 4A . Electromagnetic interference signals enter terminal  1  of the 3-terminal feedthrough capacitor and are diverted harmlessly to the ground terminal  3  ( 116 ) before they can reach the device side  111 , terminal  2 . The feedthrough capacitors ground electrode plate  146 , when properly installed, acts electrically as a continuous part of the titanium shield  116 , which houses the active implantable medical device (AIMD). The feedthrough capacitor is a 3-terminal coaxial device whose internal electrode plates “plug the insulator hole” and both reflect and absorb EMI fields. Referring back to  FIG. 4  and imagining that the feedthrough capacitor  132  has been removed, the insulator  160  acts as a wave guide. At certain frequencies, radiated electromagnetic interference may pass right through the insulator just like light passes through a window. This can be very problematic for a closely held emitter, such as a cellular telephone, which may even be placed in a shirt pocket right over the implant. Importantly, the feedthrough capacitor  132 , when properly installed, plugs this RF hole or window (wave guide), such that its active and ground electrode plates form a continuous part of the shield. The feedthrough capacitor is novel in that, it is a broadband low pass filter, which allows desirable frequencies (like pacing pulses) to pass. Because it is a unique 3-terminal coaxial device, it provides effective attenuation to undesired signals (EMI) over a very broad band (10 MHz to 10 GHz frequency range). When designed and installed properly, feedthrough capacitors are very low inductance devices, which do not series resonate. It is very important that feedthrough capacitors be installed in such a way that undesirable resistances, for example, due to titanium oxides, cannot occur in the ground connection. 
       FIG. 5A  illustrates a quadpolar feedthrough capacitor (meaning four passageways), such as previously illustrated in  FIG. 2 . It will be appreciated that any number of feedthrough holes  134  can be produced. As previously described for the unipolar capacitor of  FIG. 3 , the quadpolar capacitor of  FIG. 5A , has a ground metallization  142  and four passageways  134 , each having their own active metallization  144 . As used herein, the term active means an electrically active lead or passageway as opposed to a grounded connection. Active passageways may conduct therapeutic pacing pulses, biological sensing signals or even high-voltage therapeutic shocks. For a neurostimulator application, active passageways may include AC, pulse, triangular or many other different types of waveforms; for example, for a spinal cord stimulator to create paresthesia. 
       FIG. 5B  is taken generally from  FIG. 5B-5B  from  FIG. 5A , which illustrates the quadpolar feedthrough capacitor in cross-section. One can see that there are ground electrode plates  146 , which are disposed through the feedthrough capacitor structure and connected to the ground metallization  142 . One can also see that each of the four quadpolar passages  134  are associated with its own active electrode plates  148 , which are electrically connected through active metallization  144 . One can also appreciate that each of the feedthrough holes  134 ,  144  has its own set of active electrodes  148  that are disposed and overlapping or sandwich-type construction between the ground electrode plates  146 . It is the overlapping of the active and ground electrode plates in the dielectric that create the individual feedthrough capacitors. Each of the four feedthrough capacitors are associated with its own passageway metallization  144 . 
       FIG. 6  is an exploded view of the unipolar capacitor previously illustrated in  FIGS. 5A and 5B . There are cover sheets  147  and then an active layer showing four active electrodes  148  that are each individually associated with one of the four passageways. As one can see, the ground electrode layer  146  extends in non-conductive relationship with the active passageways to the feedthrough capacitors outside diameter. As before, these are stacked up in interleave relationship to form a quadpolar feedthrough capacitor. It is the overlapping of each one of the pie-shaped active electrode segments  148  over the ground electrode  146  that comprises each one of the capacitor&#39;s effective capacitance area (ECA). Referring once again to  FIG. 6 , one will appreciate that all four of the pie-shaped active electrode segments are of the same size. This means that the resulting feedthrough capacitance for all four of the holes will be equal. It is not necessary that this be the case. For example, some of the pie-shaped segments  148  could be larger than others, such that they could have different capacitance values as well. 
     Referring back to  FIG. 6 , one will also appreciate that the effective capacitance area, of say C 1  goes up with a number of interleaved layers. For example, shown are two interleaved triangular areas, which doubles the ECA. It will be appreciated that one, two, thirty, one hundred or even hundreds of overlapping areas can be used to greatly increase the ECA or n number. 
       FIG. 7  is the schematic drawing of the quadpolar feedthrough capacitor (C 1 , C 2 , C 3 , C 4 ) of  FIG. 6 , but in this case, this is after the feedthrough capacitor has been installed to a hermetic seal ferrule and insulator with pins, as previously described. It is assumed that the feedthrough capacitor outside diameter metallization  142  has been connected directly to either the titanium ferrule  112  or the AIMD housing  116 . In both cases, the ferrule and/or the housing would be of titanium and would be subject to oxidation. Accordingly, in the schematic drawing of  FIG. 7 , one can see that there is an undesirable R oxide  shown between each of the feedthrough capacitors  132  and ground  116  (AIMD housing). Referring once again to  FIG. 7 , one can see that each of the feedthrough capacitors  132  is labeled with terminals  1 ,  2  and  3 . At DC or direct current, there is no difference between terminals  1  and  2  as that is a solid through-pin or leadwire or passageway. However, at RF frequencies, the feedthrough capacitor  132  substantially attenuates frequencies coming from the body fluid side from terminal  1  into the inside of the AIMD housing or device side to terminal  2 . As previously stated, these undesirable EMI signals that are entering at terminal  1 , are diverted by capacitive reactance through the feedthrough capacitor to ground terminal  3 . Referring once again to  FIG. 7 , the presence of R oxide  is very undesirable, as will be explained further throughout this specification. 
       FIG. 8  illustrates a prior art rectangular feedthrough capacitor  132 , which has the same number of poles (that is 4 poles or quadpolar) as previously illustrated in  FIG. 5A . Referring once again to  FIG. 8 , one will see that the quadpolar feedthrough capacitor, in this case, is rectangular. It will be appreciated throughout this invention, that the feedthrough capacitors may be rectangular, square, have rounded corners, comprised an oval or oblong shape, ovular or even elliptical shapes. As previously mentioned, the feedthrough capacitor can be quadpolar, as illustrated, or any other number of feedthrough holes  134 . Referring once again to  FIG. 8 , the ground metallization  142  is brought out to both of the long sides of the feedthrough capacitor  132 . This is best understood by referring to  FIGS. 11 and 13 , which is taken generally from section  13 - 13  from  FIG. 12 . This illustrates the ground electrode plates and the fact that they are only exposed along the capacitor&#39;s long sides where metallization  142  can be applied. Also shown as  FIG. 10 , which is taken generally from section  10 - 10  from  FIG. 8 , illustrating four active electrodes  148 . Each of these active electrodes is associated with one of the active terminal pins  111 ,  114 . The feedthrough capacitor, as illustrated in  FIG. 8 , is shown ready for installation on top of a hermetic seal subassembly  120  that&#39;s illustrated in  FIG. 9 . Referring to  FIG. 9 , one can see that there is a metallic ferrule  112 , which is typically of titanium and an insulator  160 , which is typically of alumina and four pins or leadwires  111 ,  114 . A hermetic and mechanical seal is effected between each of the pins  111 ,  114  and the insulator  160  by gold brazes  162 . Also, the rectangular perimeter of the alumina insulator  160  is shown gold brazed  150  to the ferrule  112 . 
       FIG. 12  illustrates the feedthrough capacitor  111  installed to the hermetic seal assembly  120 , as previously described in  FIGS. 8 and 9 . As can be seen, there is an electrical connection material  152 , which connects from the capacitor&#39;s ground metallization  142  directly to the ferrule  112 . 
       FIG. 13  is taken generally from section  13 - 13  from  FIG. 12 . In this section, one can see that there is a gold braze  150  that forms a mechanical and hermetic seal between the insulator  160  and ferrule  112 . There is also a hermetic seal gold braze  162  between the insulator  160  and leadwire  111 ,  114 . In this case, the feedthrough capacitor  132  is generally larger in diameter than the gold braze hermetic seal area  150 . In this case, one can see the electrical attachment material  152  connecting between the capacitor  132  ground metallization  142  into the ferrule  112 . Layer  164  illustrates a highly undesirable oxide layer on the titanium surface of ferrule  112 . Oxide layer  164  would appear all over the surfaces of the titanium ferrule  112  but is shown disposed only between the electrical attachment material  152  and the ferrule ½ for simplicity. Referring once again to  FIGS. 12 and 13 , one can see that the ferrule  112  has an h-flange type shape  163 . This is for capturing and subsequent laser welding of AIMD housing halves  116 . 
       FIG. 14  is a schematic diagram illustrating the undesirable presence of R oxide  in the ground path of the quadpolar feedthrough capacitor. This R oxide  results from the oxide layer  164  previously described in  FIG. 13 . The presence of R oxide  can seriously compromise the proper filtering performance of each one of the quadpolar capacitors. R oxide  appears in series with the capacitive reactance. When R oxide  becomes significant (on the order of 400 milliohms or higher), this can seriously degrade filtered performance. 
       FIG. 15  shows the use of novel gold braze bond pads  165  that are one embodiment of a novel feature of U.S. Pat. No. 6,765,779, the contents of which are herein are incorporated fully by this reference. This is best understood by referring to  FIG. 16  showing that the feedthrough capacitor  132  ground metallization  142  is electrically attached  152  by a thermal-setting conductive adhesive or a solder or the like directly to this gold bond pad area  165 . It is well known that gold is a very noble material and does not oxidize.  FIG. 17  is taken from  FIG. 22  of the &#39;779 patent. This electrical connection material is labeled  332  in the &#39;779 patent. When sufficiently thick, a layer of gold will effectively block titanium oxides from interfering with the high-frequency electrical connection material  152 . This is best understood by referring to  FIG. 17 , which is taken from section  17 - 17  from  FIG. 16 . In the cross-section, one can see the electrical connection material  152  that effects a very low impedance and low resistant electrical connection between the feedthrough capacitor ground metallization  142  and the gold braze pad area  165 . During gold brazing, the gold braze pad  165  forms a continuous part of the hermetic seal  150  that effects a mechanical and hermetic joint to the insulator  160 . In other words, an essential feature of the &#39;779 patent, is that the low impedance, low resistance ground attach area is continuous with and one of the same width, as the same hermetic seal  150  that forms the hermetic seal gold braze. By electrical attachment  152  to this gold braze  150 , one virtually eliminates R oxide , as illustrated in schematic  FIG. 14 . 
       FIGS. 18 and 19  herein are taken from  FIGS. 23 and 24  of the &#39;779 patent.  FIG. 18  illustrates that the electrical connection material  152  contacts between, in this case, a round quadpolar capacitor&#39;s ground metallization  142  and the gold braze area of the hermetic seal  165 . This is best understood by referring to section  19 - 19  from  FIG. 18 , which is illustrated in  FIG. 19 . Referring to  FIG. 19 , one can clearly see that the electrical connection material  152 , which can be of thermal-setting conductive adhesive or a solder or the like, makes a low resistance/impedance (free of titanium oxides) connection between the capacitor ground metallization  142  and at least a substantial portion of the gold braze pad area  165 , which also forms the hermetic seal between the ferrule  112  and insulator  160 . This forms an oxide-resistant low impedance and low resistance electrical connection that would be robust at high-frequencies so that the feedthrough capacitor  132  can properly divert unwanted high-frequency EMI energy. Referring again to  FIG. 19 , one will appreciate that the electrical connection material  152  need only contact a significant portion of the gold braze bond pad area  165 . In other words, a portion of the electrical connection material is showing also connecting directly to ferrule  112 . A portion of the electrical connection material  152  that is attached to the ferrule would be oxidized; however, it only takes a portion of electrical material  152  to contact the oxide-resistant gold  165  to affect a low impedance and low resistance electrical connection. As defined herein, an EMI filter hermetically sealed assembly for an active implantable medical device, will be herein designated as assembly  210 . The &#39;779 Patent has enjoyed great commercial success and has proven to be highly reliable. Manufacturing processes of the &#39;779 Patent does require tight dimensional tolerances between the ferrule inside diameter and the alumina insulator outside diameter or perimeter. In addition, the oxide-resistant pads as described in the &#39;779 Patent require a significant amount of extra gold to be used in the process which is thereby increasingly expensive. Referring once again to  FIG. 17  (rectangular) and  FIG. 19  (discoidal), one will appreciate a serious limitation. While attachment to gold has eliminated the problems associated with R oxide , the diameter of the feedthrough capacitor or the length and the width of a rectangular capacitor have both been significantly constrained. For example, referring to  FIG. 19 , if the diameter of the feedthrough capacitor  132  were increased such that its outside diameter metallization  142  was either aligned with the outermost perimeter of the ferrule or slightly smaller than the outermost perimeter of the ferrule, one could see that there would be no possible way to effect the electrical connection  152  to the gold braze pad area  165 . Over the past several years, the number of leads required for the feedthrough of an active implanted medical device have constantly increased. This can be best understood in the cardiac space where early pacemakers only paced the right ventricle. Then dual chamber pacing came along with bipolar electrodes in both the right ventricle and the right atrium. Modern devices, also known as cardiac resynchronization devices now have quadpolar leads that are routed through the coronary sinus and are outside the left ventricle. Added to these are defibrillation functions. Accordingly, modern devices have as many as 8, 10 or even 12 leads. A significant market driving force is the need to make these multi-lead devices thin enough and small enough for patient comfort as having too thick of an AIMD housing placed in the pectoral pocket, becomes very uncomfortable for the patient. In summary, the gold bond pads of  FIGS. 17 and 19 , work very well to eliminate the oxidation problem, but do constrain the geometry such that the resultant devices have relatively low volumetric efficiency. 
       FIG. 19A  illustrates filter performance otherwise known as attenuation or insertion loss curves vs frequency. An ideal attenuation curve is shown for a feedthrough capacitor C,  132 . One can see that it has a slight self-resonance (SRF) above 1 GHz and then continues to function. Accordingly, it becomes a broadband 3-terminal filter as previously described. As can be seen, the ideal feedthrough capacitor has over 30 dB of attenuation at all frequencies above 100 MHz. This frequency range is important because that&#39;s the range at which cell phones operate and other emitters. Cell phones are of particular concern to active implantable medical devices because they are small and can be brought into very close proximity to a medical implant. For example, one concern is for a pacemaker patient where the cell phone may be placed in a shirt pocket directly over the implant. This would couple maximum energy to implanted leads. Referring once again to the insertion loss attenuation curves of  FIG. 19A , one can see what happens when the feedthrough capacitor has undesirable resistive oxide (R oxide  in its ground electrical path. The oxide degrades the attenuation or filter performance such that you end up with a curve, which provides less than 30 dB of attenuation at frequencies above 100 MHz. This seriously degraded filter performance is of great concern because if a closely held emitter, such as a cellular telephone, interferes with, for example, a pacemaker sense circuit, it can undesirably cause the pacemaker to inhibit. Inhibit means that it would fail to provide life-saving therapeutic pulses. One might ask, why are pacemakers designed to inhibit? Well, there are two reasons: Many patients who suffer from bradycardia (a very low heart rate) are not bradycardic all-day long. In other words, they can come in and out of bradycardic (life-threatening) condition. Therefore, demand pacemakers were developed such that when a patient&#39;s normal sinus rhythm returns, the pacemaker will inhibit. This is to not only save battery life, but also prevents a condition called rate competition. This is where you wouldn&#39;t want the pacemaker to provide a pulse that is out of sync or competitive with a patient&#39;s intrinsic rhythm. However, this does lead to electromagnetic interference danger. If EMI is undesirably detected as a normal cardiac pulse, it can cause the device to inhibit, which is immediately life-threatening for a pacemaker dependent patient. 
       FIG. 20A  illustrates a discoidal capacitor  24  with a counterbore hole  46  that slips over a ferrule  28 ′ and a hermetic seal  30  and was taken from FIG. 2 of U.S. Pat. No. 5,333,095, the contents of which are included herein by reference. The feedthrough capacitor is metallized on its outside diameter and there is an electrical attachment  56  between the feedthrough capacitor metallization and an AIMD housing  22  ( 116 ). In this case, there is no electrical connection described between the feedthrough capacitor ground metallization and the ferrule. In fact, the opposite is taught, in that, electrical connection  56  ( 152 ) is directly to the AIMD housing structure. It was not known at the time of the &#39;095 invention that serious problems would show up with R oxide , as has been previously described. 
       FIG. 20B  is a cross-sectional view taken from  FIG. 6  of the &#39;095 patent. It shows its ground electrode plates  42  ( 146 ) coming to the outside diameter. There is a metallization (not shown) but labeled as  52  ( 142 ). It is this ground metallization that is electrically attached  56  ( 152 ) directly to the AIMD housing  22  ( 116 ). Referring to  FIGS. 20A and 20B , the feedthrough capacitor  142  overhangs the ferrule  28 ( 112 ), but is not electrically connected to it. The electrical connection  56 ( 152 ) is between the capacitor outside diameter metallization ( 142 ) directly to the AIMD housing  22 ( 116 ). In addition, the feedthrough capacitor  24 ( 132 ) of  FIGS. 20A and 20B  is round and overhangs the ferrule in all directions.  321   FIG. 20C  is taken from  FIG. 17  of the &#39;095 patent and illustrates capacitor  224  ( 132 ) disposed directly onto an AIMD housing surface  22  ( 116 ). As one can see, the ferrule  234  ( 112 ) has been previously attached to the AIMD housing  22  ( 116 ). In this case, the feedthrough capacitor  224  ( 132 ) would be later added and then a ground connection would be made from the outside diameter metallization  224  ( 132 ) directly to the AIMD housing  22  ( 116 ). In other words, there is no direct connection from the feedthrough capacitor ground metallization to the ferrule at all. 
     Referring once again to  FIG. 20D , there is an even larger problem. There is no way to make in effect, an electrical connection between the ferrule  334  ( 112 ) and the outside diameter metallization ( 142 ) of the feedthrough capacitor  324  ( 132 ).  FIG. 13  herein, shows the problem with an effecting electrical connection  152  directly to a titanium ferrule  112 . As once can see, there is a highly undesirable oxide layer  164  that is formed on the titanium. This oxide layer is both resistive and also acts as a semi-conductor. The presence of either a resistance or a semi-conductance, severely degrades the EMI filters ability to divert high-frequency RF signals. The importance of capacitor ground attachment to an oxide-resistance ferrule surface is taught in U.S. Pat. No. 6,765,779, the contents of which are incorporated herein fully by reference.  FIG. 17  teaches the &#39;779 patent methodology of having the electrical connection material  152  connect from the feedthrough capacitor ground metallization  142  to a gold braze extension of the hermetic seal  150 ,  165 . Again, referring to  FIG. 20D , there is no possible way, with a capacitor  324  ( 132 ) disposed outside the ferrule, to make a connection to the gold braze area between the ferrule and the insulator. This gold braze area is not shown but is indicated by element  325 . 
     SUMMARY OF THE INVENTION 
     Various embodiments of the present application comprise a ferrule for a hermetic terminal for use in an AIMD, wherein the ferrule is provided with one or more recessed pockets on one of a ferrule device side, a ferrule body fluid side and combinations thereof. In some embodiments, the recessed pocket of the ferrule resides on one of a ferrule perimeter, a ferrule edge, a ferrule peninsula, a ferrule bridge, or combinations thereof. In some embodiments, the recessed pocket of the ferrule comprises a pocket-pad nested therein, wherein the pocket-pad may comprise an oxide-resistant material such as gold, platinum, palladium, silver, iridium, rhenium, rhodium, tantalum, tungsten, niobium, zirconium, vanadium, and combinations or alloys thereof. The term “oxide-resistant” is defined herein as the ability of a substance to maintain its original material properties after being exposed to oxygen; a resistance to oxidation under extreme conditions such as high temperature, essentially resists reaction with oxygen or oxygen-containing enviromnents. 
     For mechanical connections only, titanium alloys may also be used, that is, when only a physical connection is required but electrical conductivity is not needed, as the alloying of titanium offers the beneficial effect of increasing the alloys oxidation resistance, while simultaneously offering additional strength, flexibility and malleability to the pocket-pad of the ferrule. 
     Some exemplary platinum-based oxide-resistant alloys for use in the pocket-pads of the present application include: platinum-rhodium, platinum-iridium, platinum-palladium, or platinum-gold. Naturally occurring oxide-resistant alloy examples include: platiniridium (platinum-iridium), iridiosmium and osmiridium (iridium-osmium). Other oxide-resistant pocket-pad alloys include: gold-based, platinum-based, palladium-based, silver-based, among others, wherein the metal-based element is the largest weight percent (&gt;50%) of the total alloying elements of the alloy. Non-limiting noble metal-based oxide-resistant alloys for use in the pocket-pads of the present application include: gold-palladium, gold-boron, and palladium-silver. It is anticipated that proprietary oxide-resistant alloys such as but not limited to the Pallabraze product family (palladium-containing) and Orobraze product family (gold-containing) offered by Johnson Matthey may additionally be used to form oxide-resistant pocket-pads of the present application. 
     It is noted that the term “gold pocket-pad”, which is used extensively herein, is not meant to be limiting, but instead is only exemplary of an oxide-resistant pocket-pad. It is understood that a gold pocket-pad is more broadly defined as an oxide-resistant pocket pad. As such, the oxide-resistant pocket-pad of the present invention may comprise any of the materials disclosed above in combination with or instead of gold. Oxide-resistant pocket-pads enable very low resistance and time-stable electrical connections, which, in turn, provide very low equivalent series resistance (ESR) electrical connections. Oxide-resistant time-stable electrical connections are very important for medical devices, particularly active medical implantable devices or AIMDs, as the inventors have discovered that, without oxide-resistant time-stable electrical connections, highly reactive materials, such as titanium, can oxidize over time, which can cause latent dangerous and unpredictable AIMD EMI filter performance issues. More importantly, EMI filter failure resultant oxide build-up over time can be life-threatening. It has been shown in numerous articles that EMI can disrupt the proper operation of an AIMD. For example, if an EMI filter fails to filter, for example, in a cardiac pacemaker, the EMI can then enter the housing of the pacemaker within which the therapy delivery circuitry resides. EMI inside the pacemaker can lead to improper therapy or even complete inhibition of therapy to the patient. Inhibition of therapy from a cardiac pacemaker to a pacemaker dependent patient can be immediately life-threatening to that patient. While a titanium oxide layer on the highly reactive titanium metal surface imparts good corrosion behavior and high biocompatibility, which is why titanium is used so extensively in medical implantable devices, the titanium oxide layer that forms so readily on the titanium metal can and does negatively impact AIMD EMI filter performance, the negative impact being particularly observable at higher frequency applications, such as switching applications, coupling applications, bypass applications in addition to EMI filtering. 
     An embodiment of the present invention is a feedthrough, comprising: a) an electrically conductive ferrule, comprising: i) a ferrule sidewall defining a ferrule opening, the ferrule sidewall having a height h extending to a ferrule first side end surface and a ferrule second side end surface; ii) at least one recessed pocket having a depth d extending from at least one of the ferrule first side end surface and the ferrule second side end surface part-way through the height h of the ferrule toward the other of the ferrule first side end surface and the ferrule second side end surface; iii) an oxide-resistant pocket-pad nested in the at least one recessed pocket and being electrically connected to the ferrule; and iv) an electrical connection material supported on the oxide-resistant pocket-pad opposite the ferrule; and b) an insulator hermetically sealed to the ferrule in the ferrule opening, the insulator extending to an insulator first side end surface adjacent to the ferrule first side end surface and an insulator device side end surface adjacent to the ferrule second side end surface; c) at least one active via hole extending through the insulator to the insulator first and second side end surfaces; and d) an active conductive pathway residing in and hermetically sealed to the insulator in the at least one active via hole. 
     An embodiment of the present invention is a filter feedthrough assembly configured to be installed in an opening of a housing ( 116 ) of an active implantable medical device (AIMD  100 ), the filter feedthrough comprising: a) an electrically conductive ferrule ( 112 ) separating a body fluid side opposite a device side, the body fluid side configured to reside outside the AIMD housing and the device side configured to reside inside the AIMD housing, the ferrule including a ferrule opening ( 306 ) extending between and to the body fluid side and the device side; b) an insulator ( 160 ) hermetically sealing the ferrule opening; c) at least one conductive pathway ( 111 , 114 , 117 , 185 , 186 ) hermetically sealed to and disposed through the insulator between the body fluid side and the device side, the at least one conductive pathway being in non-electrically conductive relation with the ferrule; d) a feedthrough capacitor ( 132 ) disposed on the device side; e) wherein at least a first edge ( 322 ) of the feedthrough capacitor extends beyond a first outermost edge ( 302 ) of the ferrule; and f) wherein at least a second edge ( 322 ) of the feedthrough capacitor does not extend beyond a second outermost edge ( 304 ) of the ferrule. Regarding part f), in other words, at least a second edge of the feedthrough capacitor is either aligned with or is set back from a second outermost edge of the ferrule. 
     In other exemplary embodiments, the feedthrough capacitor may comprise: i) at least one active electrode plate disposed parallel and spaced from at least one ground electrode plate, wherein the at least one active and ground electrode plates are disposed within a capacitor dielectric; ii) a capacitor active metallization electrically connected to the at least one active electrode plate and in non-electrically conductive relation with the at least one ground electrode plate; and iii) a capacitor ground metallization electrically connected to the at least one ground electrode plate and in non-electrically conductive relation with the at least one active electrode plate. The capacitor active metallization may be electrically connected to the at least one conductive pathway. The capacitor ground metallization may be electrically connected to the ferrule. The insulator may hermetically seal the ferrule opening by at least one of a first gold braze, a ceramic seal, a glass seal or a glass-ceramic seal. The ferrule may have a rectangular shape, the first outermost edge and the second outermost edge forming at least a part of the rectangular shape. The first outermost edge of the ferrule may be perpendicular to the second outermost edge of the ferrule. 
     Another embodiment of the present invention is a filter feedthrough configured to be installed in an opening of a housing an active implantable medical device (AIMD), the filter feedthrough comprising: a) an electrically conductive ferrule separating a body fluid side opposite a device side, the body fluid side configured to reside outside the AIMD housing and the device side configured to reside inside the AIMD housing, the ferrule including a ferrule opening extending between and to the body fluid side and the device side; b) an insulator hermetically sealing the ferrule opening by at least one of a first gold braze, a ceramic seal, a glass seal or a glass-ceramic; c) at least one conductive pathway hermetically sealed to and disposed through the insulator between the body fluid side and the device side, the at least one conductive pathway being in non-electrically conductive relation with the ferrule; d) a feedthrough capacitor disposed on the device side, the feedthrough capacitor comprising: i) at least one active electrode plate disposed parallel and spaced from at least one ground electrode plate, wherein the at least one active and ground electrode plates are disposed within a capacitor dielectric; ii) a capacitor active metallization electrically connected to the at least one active electrode plate and in non-electrically conductive relation with the at least one ground electrode plate; and iii) a capacitor ground metallization electrically connected to the at least one ground electrode plate and in non-electrically conductive relation with the at least one active electrode plate; e) wherein the capacitor active metallization is electrically connected to the at least one conductive pathway; f) wherein the capacitor ground metallization is electrically connected to the ferrule; g) wherein at least a first edge of the feedthrough capacitor extends beyond a first outennost edge of the ferrule; h) wherein at least a second edge of the feedthrough capacitor is either aligned with or is set back from a second outermost edge of the ferrule; i) wherein the ferrule has a rectangular shape, the first outermost edge and the second outermost edge forming at least a part of the rectangular shape; and j) wherein the first outermost edge is perpendicularly disposed in relation to the second outermost edge. 
     Another embodiment of the present invention includes a filter feedthrough that is attachable to an active implantable medical device (AIMD), the filter feedthrough comprising: a) a feedthrough, comprising: i) an electrically conductive ferrule separating a body fluid side opposite a device side, the ferrule comprising a ferrule outermost edge, and a ferrule opening extending to the ferrule body fluid and device sides, wherein, when the ferrule is attached to an opening in a housing of an AIMD, the ferrule body fluid and the ferrule device sides reside outside the AIMD and inside the AIMD, respectively; ii) an insulator at least partially residing in the ferrule opening where the insulator is hermetically sealed to the ferrule; iii) at least one active via hole extending through the insulator; iv) an active conductive pathway residing in and hermetically sealed to the insulator in the at least one active via hole; b) a feedthrough capacitor disposed on the device side of the ferrule, the feedthrough capacitor comprising: i) at least one active electrode plate interleaved in a capacitive relationship with at least one ground electrode plate, wherein the at least one active and ground electrode plates are disposed in a capacitor dielectric; ii) at least one active passageway extending through the capacitor dielectric, the at least one passageway having a capacitor active metallization electrically connected to the at least one active electrode plate; iii) a capacitor ground metallization electrically connected to the at least one ground electrode plate; c) a first electrical connection material electrically connecting the active pathway of the insulator to the active metallization electrically connected to the at least one active electrode plate; and d) a second electrical connection material electrically connecting the capacitor ground metallization electrically connected to the at least one ground electrode plate to the ferrule; e) wherein a first portion of the feedthrough capacitor extends beyond the outermost edge of the ferrule, and a second portion is spaced inwardly from the outermost edge of the ferrule. 
     Another embodiment of the present invention includes a filter feedthrough that is attachable to an active implantable medical device (AIMD), the filter feedthrough comprising: a) a feedthrough, comprising: i) an electrically conductive ferrule ( 112 ) comprising a ferrule sidewall ( 309 ) extending to a ferrule body fluid side end ( 308 ) surface and to a ferrule device side end surface ( 310 ), the ferrule sidewall further comprising a ferrule outermost surface ( 302 , 304 ) and a ferrule inner surface ( 307 ) defining a ferrule opening ( 306 ) extending to the ferrule body fluid and device side end surfaces, wherein, when the ferrule is attached to an opening in a housing ( 116 ) of an AIMD ( 100 ), the ferrule body fluid side end surface and the ferrule device side end surface reside outside the AIMD and inside the AIMD, respectively; ii) an insulator ( 160 ) at least partially residing in the ferrule opening where the insulator is hermetically sealed to the ferrule, the insulator extending to an insulator body fluid side end surface ( 312 ) and to an insulator device side end surface ( 314 ); iii) at least one active via hole ( 316 ) extending through the insulator to the insulator body fluid and device side end surfaces; and iv) an active conductive pathway ( 111 , 114 , 117 , 185 , 186 ) residing in and hermetically sealed to the insulator in the at least one active via hole; b) a feedthrough capacitor ( 132 ) disposed on the device side of the ferrule, the feedthrough capacitor comprising: i) a capacitor dielectric ( 147 ) having a capacitor dielectric outer sidewall ( 322 ) extending to a capacitor dielectric first end surface ( 326 ) and to a capacitor dielectric second end surface ( 324 ); ii) at least one active electrode plate ( 148 ) interleaved in a capacitive relationship with at least one ground electrode plate ( 146 ) in the capacitor dielectric; iii) at least one active passageway ( 134 ) extending through the capacitor dielectric to the capacitor dielectric first and second end surfaces; iv) a capacitor active metallization ( 144 ) contacting the capacitor dielectric in the at least one active passageway and being electrically connected to the at least one active electrode plate; and v) a capacitor ground metallization ( 142 ) electrically connected to the at least one ground electrode plate; and c) a first electrical connection material ( 156 ) electrically connecting the active conductive pathway residing in the at least one active via hole in the insulator to the active metallization electrically connected to the at least one active electrode plate of the feedthrough capacitor; and d) a second electrical connection material ( 152 ) electrically connecting the capacitor ground metallization electrically connected to the at least one ground electrode plate of the feedthrough capacitor to the ferrule; e) wherein an imaginary projection ( 334 ,FP L1 ,FP L2 ) of the ferrule outermost surface onto the capacitor dielectric second end surface defines: A) at least one capacitor dielectric imaginary first overhang portion ( 330 ) extending laterally outwardly beyond the ferrule outermost surface; and B) a capacitor dielectric imaginary second overlay portion ( 203 ) that overlays the ferrule device side end surface and overlays the hermetically sealed insulator; C) wherein at least part of the capacitor dielectric outer sidewall in the capacitor dielectric imaginary second overlay portion is spaced inwardly ( 201 ) from the ferrule outermost surface, and wherein the at least one ground electrode plate at least partially resides in the capacitor dielectric imaginary second overlay portion. 
     In other exemplary embodiments, at least a portion of the capacitor ground metallization may contact the capacitor outer sidewall in the capacitor dielectric imaginary second overlay portion and is electrically connected to the ferrule by the second electrical connection material. 
     The second electrical connection material electrically may connect the capacitor ground metallization electrically connected to the at least one ground electrode plate of the feedthrough capacitor to at least one of the ferrule and a first gold braze hermetically sealing the insulator to the ferrule. 
     The ferrule device side end surface may be provided with at least one recessed pocket residing adjacent to the outer sidewall of the capacitor dielectric imaginary second overlay portion, the recessed pocket having a gold pocket-pad nested therein and being electrically connected to the ferrule, and the second electrical connection material may electrically connect the capacitor ground metallization electrically connected to the at least one ground electrode plate at least partially residing in the capacitor dielectric imaginary second overlay portion to the gold pocket-pad. 
     The ferrule outermost surface may comprise opposed ferrule first and second outermost surface portions meeting opposed ferrule third and fourth outermost surface portions; and the capacitor dielectric outer sidewall may comprise opposed capacitor dielectric first and second outer sidewall portions meeting opposed capacitor dielectric third and fourth outer sidewall portions, wherein the imaginary projection of the ferrule outermost surface onto the capacitor dielectric second end surface may provide the ferrule first and second outermost surface portions intersecting the capacitor dielectric third and fourth outer sidewall portions to thereby provide: A) the capacitor dielectric first overhang portion comprising the capacitor dielectric first outer sidewall portion extending laterally outwardly beyond the ferrule first outermost surface portion; B) the capacitor dielectric imaginary second overlay portion overlaying the ferrule device side end surface and the hermetically sealed insulator; and C) a capacitor dielectric third overhang portion comprising the capacitor dielectric second outer sidewall portion extending laterally outwardly beyond the ferrule second outermost surface portion; and wherein the imaginary projections of the ferrule third and fourth outermost surface portions do not intersect the capacitor dielectric third and fourth outer sidewall portions to thereby expose portions of the ferrule device side end surface adjacent to the respective capacitor dielectric third and fourth outer sidewall portions. 
     The ferrule first and second outermost surface portions may be longer than the ferrule third and fourth outermost surface portions to thereby provide the ferrule having a first rectangular shape in plan-view, and wherein the capacitor dielectric first and second outer sidewall portions may be longer than the capacitor dielectric third and fourth outer sidewall portions to thereby provide the capacitor dielectric having a second rectangular shape in plan-view. 
     The capacitor ground metallization may contact at least one of the capacitor dielectric third and fourth outer sidewall portions, and wherein the second electrical connection material electrically connects the capacitor ground metallization to the ferrule device side end surface, spaced inwardly from a corresponding one of at least one of the ferrule third and fourth outermost surface portions. 
     The ferrule device side end surface may be provided with at least one recessed pocket residing adjacent to at least one of the ferrule third and fourth outermost surface portions, the recessed pocket having a gold pocket-pad nested therein and being electrically connected to the ferrule, and wherein the capacitor ground metallization contacts at least one of the capacitor dielectric third and fourth outer sidewall portions with the second electrical connection material electrically connecting the capacitor ground metallization to the gold pocket-pad. 
     The ferrule outermost surface may comprise opposed ferrule first and second outermost surface portions meeting opposed ferrule third and fourth outermost surface portions, the ferrule first and second outermost surface portions being linear and the ferrule third and fourth outermost surface portions having a radiused shape to thereby provide the ferrule having a first oval shape in plan-view; and the capacitor dielectric outer sidewall may comprise opposed capacitor dielectric first and second outer sidewall portions meeting opposed capacitor dielectric third and fourth outer sidewall portions, the capacitor dielectric first and second outer sidewall portions being linear and the capacitor dielectric third and fourth outer sidewall portions having a radiused shape to thereby provide the capacitor dielectric having a second oval shape in plan-view, wherein the imaginary projection of the ferrule outermost surface onto the capacitor dielectric second end surface may provide the ferrule first and second outermost surface portions intersecting the capacitor dielectric third and fourth outer sidewall portions to thereby provide: A) the capacitor dielectric first overhang portion comprising the capacitor dielectric first outer sidewall portion extending laterally outwardly beyond the ferrule first outermost surface portion; B) the capacitor dielectric imaginary second overlay portion overlaying the ferrule device side end surface and the hermetically sealed insulator; and C) a capacitor dielectric third overhang portion comprising the capacitor dielectric second outer sidewall portion extending laterally outwardly beyond the ferrule second outermost surface portion, and wherein the imaginary projections of the ferrule third and fourth outermost surface portions may not intersect the capacitor dielectric third and fourth outer sidewall portions to thereby expose portions of the ferrule device side end surface adjacent to the respective capacitor dielectric third and fourth outer sidewall portions. 
     The capacitor ground metallization may contact at least one of the capacitor dielectric third and fourth outer sidewall portions, and wherein the second electrical connection material electrically connects the capacitor ground metallization to the ferrule device side end surface, spaced inwardly from at least one of the ferrule third and fourth outermost surface portions. 
     The ferrule device side end surface may be provided with at least one recessed pocket residing adjacent to at least one of the ferrule third and fourth outermost surface portions, the recessed pocket having a gold pocket-pad nested therein and being electrically connected to the ferrule, and wherein the capacitor ground metallization contacts at least one of the capacitor dielectric third and fourth outer sidewall portions with the second electrical connection material electrically connecting the capacitor ground metallization to the gold pocket-pad.  54 J The filter feedthrough may further comprise: a) at least one ground passageway extending through the capacitor dielectric to the capacitor dielectric first and second end surfaces, the capacitor ground metallization residing in the ground passageway and being electrically connected to the at least one ground electrode plate; b) a peninsula extending from the ferrule sidewall inwardly into the ferrule opening, wherein the second electrical connection material electrically connects the ground metallization electrically connected to the at least one ground electrode plate of the feedthrough filter to the ferrule peninsula, and c) wherein the ferrule outermost surface comprises opposed ferrule first and second outermost surface portions meeting opposed ferrule third and fourth outermost surface portions; and d) the capacitor dielectric outer sidewall comprises opposed capacitor dielectric first and second outer sidewall portions meeting opposed capacitor dielectric third and fourth outer sidewall portions; e) wherein the imaginary projection of the ferrule outermost surface onto the capacitor dielectric second end surface provides the ferrule first and second outermost surface portions intersecting the capacitor dielectric third and fourth outer sidewall portions to thereby provide the capacitor dielectric first overhang portion comprising the capacitor dielectric first outer sidewall portion extending laterally outwardly beyond the ferrule first outermost surface portion, a capacitor dielectric imaginary second overlay portion overlaying the ferrule device side end surface and the hermetically sealed insulator, and a capacitor dielectric third overhang portion comprising the capacitor dielectric second outer sidewall portion extending laterally outwardly beyond the ferrule second outermost surface portion; and f) wherein the imaginary projections of the ferrule third and fourth outermost surface portions do not intersect the capacitor dielectric third and fourth outer sidewall portions to thereby expose portions of the ferrule device side end surface adjacent to the respective capacitor dielectric third and fourth outer sidewall portions; and g) wherein the capacitor ground metallization also contacts the capacitor dielectric third and fourth outer sidewall portions, and wherein the second electrical connection material also electrically connects the capacitor ground metallization to the ferrule device side end surface, spaced inwardly from the ferrule third and fourth outermost surface portions. 
     The ferrule first and second outermost surface portions may be longer than the ferrule third and fourth outermost surface portions, and the capacitor dielectric first and second outer sidewall portions are longer than the capacitor dielectric third and fourth outer sidewall portions. 
     The active conductive pathway in the insulator may comprise a metallic leadwire residing in the at least one active via hole where a gold braze hermetically seals the leadwire to the insulator. 
     The leadwire may extend to a leadwire body fluid side portion extending outwardly beyond the insulator body fluid side end surface and a leadwire device side portion extending outwardly beyond the insulator device side end surface, the leadwire device side portion residing in the at least one active passageway in the capacitor dielectric where the leadwire is electrically connected to the at least one active electrode plate of the feedthrough capacitor. 
     The at least one active via hole in the insulator may be defined by an active via hole inner surface extending along a longitudinal axis to the insulator body fluid and device side end surfaces, and wherein the active conductive pathway residing in the at least one active via hole comprises: a) a layer of a ceramic reinforced metal composite (CRMC) comprising a mixture of alumina and platinum that contacts the active via hole inner surface, the layer of CRMC extending from a CRMC first end residing at or adjacent to the insulator device side end surface to a CRMC second end residing at or adjacent to the insulator body fluid side end surface, wherein an inner surface of the CRMC is spaced toward the longitudinal axis with respect to the via hole inner surface; and b) a substantially pure platinum material that contacts the CRMC inner surface, the substantially pure platinum material extending from a substantially pure platinum material first end residing at or adjacent to the insulator device side end surface to a substantially pure platinum material second end residing at or adjacent to the insulator body fluid side end surface. 
     The CRMC first and second ends and the substantially pure platinum material first and second ends may extend to the respective insulator body fluid and device side end surfaces. 
     At least one of the CRMC first and second ends may be recessed inwardly into the active via hole from the respective insulator body fluid and device side end surfaces, and wherein the substantially pure platinum material may extend to the insulator body fluid and device side end surfaces. 
     At least one of the CRMC first and second ends may be recessed inwardly into the active via hole in the insulator from the respective insulator body fluid and device side end surfaces, and wherein a corresponding at least one of the substantially pure platinum material first and second end may be recessed inwardly into the active via hole from the respective insulator body fluid and device side end surfaces, and wherein a metallic end cap may extend from the at least one recessed CRMC first and second end and the correspondingly recessed substantially pure platinum material first and second end to the corresponding insulator body fluid and device side end surface. 
     The metallic end cap may comprise platinum. The substantially pure platinum material is a platinum wire. The platinum wire may be exposed at the insulator device side end surface. The platinum wire may extend through the substantially pure platinum material to the insulator body fluid and device side end surfaces, the platinum wire being spaced from the layer of CRMC contacting the active via hole inner surface in the insulator. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings illustrate the invention. In such drawings: 
         FIG. 1  is a wire-formed diagram of a generic human body showing a number of exemplary implantable medical devices; 
         FIG. 2  is a side view of a prior art cardiac pacemaker; 
         FIG. 2A  is a wire-formed diagram illustrating how RF fields are absorbed into a lead of an implantable medical device; 
         FIG. 3  is an isometric cut-away view of a prior art unipolar feedthrough capacitor; 
         FIG. 3A  is an exploded isometric view of the unipolar capacitor of  FIG. 3 ; 
         FIG. 4  is a sectional view of a prior art hermetic feedthrough terminal; 
         FIG. 4A  is an electrical schematic of the structure of  FIG. 4 ; 
         FIG. 5A  illustrates a quadpolar feedthrough capacitor; 
         FIG. 5B  is a sectional view taken generally from  FIG. 5B-5B  from  FIG. 5A , which illustrates the quadpolar feedthrough capacitor of  FIG. 5A ; 
         FIG. 6  is an exploded isometric view of the unipolar capacitor previously illustrated in  FIGS. 5A and 5B ; 
         FIG. 7  is the schematic drawing of the feedthrough capacitor of  FIGS. 5A-5B ; 
         FIG. 8  illustrates a prior art rectangular feedthrough capacitor, which has the same number of poles ( 4 , quadpolar) as previously illustrated in  FIG. 4A ; 
         FIG. 9  is an isometric view illustrating the hermetic seal subassembly ready to receive the capacitor of  FIG. 8 ; 
         FIG. 10  is taken generally from section  10 - 10  from  FIG. 8  showing the active electrode plates; 
         FIG. 11  is taken generally from section  11 - 11  from  FIG. 8  showing the ground electrode plate; 
         FIG. 12  illustrates the feedthrough capacitor installed to the hermetic seal assembly as previously described in  FIGS. 8 and 9 ; 
         FIG. 13  is a sectional view taken generally from section  13 - 13  from  FIG. 12 ; 
         FIG. 14  is an electrical schematic diagram illustrating the undesirable presence of an oxide in the ground path of the quadpolar feedthrough capacitor; 
         FIG. 15  shows the use of novel gold braze bond pads that are one embodiment of a novel feature of the &#39;596 patent; 
         FIG. 16  shows that the feedthrough capacitor ground metallization is electrically attached by a thermal-setting conductive adhesive directly to the gold bond pad area; 
         FIG. 17  is a sectional view taken from section  17 - 17  from  FIG. 16 ; 
         FIG. 18  is an isometric view taken from  FIG. 23  of the &#39;779 patent; 
         FIG. 19  is a sectional view of the structure of  FIG. 18  taken along lines  19 - 19 ; 
         FIG. 19A  illustrates filter performance otherwise known as attenuation or insertion loss curves versus frequency; 
         FIG. 20A  illustrates sectional isometric view of a prior art feedthrough; 
         FIG. 20B  is a sectional view of a prior art feedthrough; 
         FIG. 20C  is an exploded sectional view of a prior art feedthrough; 
         FIG. 20D  is an exploded sectional view of a prior art feedthrough; 
         FIG. 21A  is an isometric view of just a ferrule that can be used with the present invention; 
         FIG. 21B  is a sectional view of one embodiment of a ferrule taken along lines  21 B- 21 B from  FIG. 21A ; 
         FIG. 21C  is a sectional view of another embodiment of the ferrule taken along lines  21 C- 21 C from  FIG. 21A ; 
         FIG. 21D  is an isometric view of just an insulator that can be used with the present invention; 
         FIG. 21E  is a sectional view taken along lines  21 E- 21 E of  FIG. 21D ; 
         FIG. 21F  is an isometric exploded view of a feedthrough before the present invention capacitor is attached; 
         FIG. 22  is an isometric view of the present invention where the capacitor overhangs the ferrule edge on two edges for an increased effective capacitance area; 
         FIG. 22A  is a sectional isometric view taken along lines  22 A- 22 A from  FIG. 22 ; 
         FIG. 22B  is a sectional isometric view taken along lines  22 B- 22 B from  FIG. 22 ; 
         FIG. 22C  is a sectional isometric view taken along lines  22 C- 22 C from  FIG. 22 ; 
         FIG. 22D  is a sectional isometric view taken along lines  22 D- 22 D from  FIG. 22 ; 
         FIG. 22E  is a side view taken along lines  22 E- 22 E from  FIG. 22 ; 
         FIG. 22F  is a side view taken along lines  22 F- 22 F from  FIG. 22 ; 
         FIG. 22G  is an isometric view of another embodiment of the present invention where now the capacitor only overhangs the ferrule along one edge of the ferrule; 
         FIG. 22H  is a side view taken along lines  22 H- 22 H from  FIG. 22G ; 
         FIG. 22I  is a side view taken along lines  22 I- 221  from  FIG. 22G ; 
         FIG. 22J  is a side view similar to  FIG. 22H  now showing a new embodiment similar to  FIG. 22G  where the capacitor is aligned along the left side; 
         FIG. 22K  is a side view similar to  FIG. 22I  if it was taken of the structure of  FIG. 22J  along the lines  22 H- 22 H of  FIG. 22G ; 
         FIG. 22L  is a sectional view of the active electrode plates taken along lines  22 L- 22 L of  FIG. 22E ; 
         FIG. 22M  is a sectional view of the active electrode plates taken along lines  22 M- 22 M of  FIG. 22H ; 
         FIG. 22N  is a sectional view of the active electrode plates taken along lines  22 N- 22 N of  FIG. 22J ; 
         FIG. 22O  is a simplified top view illustrating one embodiment of the capacitor overhanging the ferrule; 
         FIG. 22P  is a simplified top view illustrating another embodiment of the capacitor overhanging the ferrule; 
         FIG. 22Q  is a simplified top view illustrating another embodiment of the capacitor overhanging the ferrule; 
         FIG. 22R  is a simplified top view illustrating another embodiment of the capacitor overhanging the ferrule; 
         FIG. 22S  is a simplified top view illustrating another embodiment of the capacitor overhanging the ferrule; 
         FIG. 22T  is a simplified top view illustrating another embodiment of the capacitor overhanging the ferrule; 
         FIG. 22U  is a simplified top view illustrating another embodiment of the capacitor overhanging the ferrule; 
         FIG. 22V  is a simplified top view illustrating another embodiment of the capacitor overhanging the ferrule; 
         FIG. 22W  is a simplified top view illustrating another embodiment of the capacitor overhanging the ferrule; 
         FIG. 23  is an isometric view of another embodiment of the present invention now having gold pocket-pads; 
         FIG. 23A  is an enlarged isometric view of another embodiment of a pocket with an oxide-resistant metal trough or an oxide-resistant metal addition such as platinum wire for grounding; 
         FIG. 24  is an isometric view of the present invention similar to  FIG. 23  now with an overhanging capacitor; 
         FIG. 24A  is a sectional isometric view taken along lines  24 A- 24 A from  FIG. 24 ; 
         FIG. 24B  is a sectional isometric view taken along lines  24 B- 24 B from  FIG. 24 ; 
         FIG. 24C  is a side view taken along lines  24 C- 24 C from  FIG. 24 ; 
         FIG. 24D  is a side view taken along lines  24 D- 24 D from  FIG. 24 ; 
         FIG. 25  is an exploded isometric view of another embodiment of the present invention; 
         FIG. 26  is an isometric view of the structure of  FIG. 25  now with the capacitor installed; 
         FIG. 26A  is an isometric view taken along lines  26 A- 26 A from  FIG. 26 ; 
         FIG. 26B  is an isometric view taken along lines  26 B- 26 B from  FIG. 26 ; 
         FIG. 26C  is an isometric view taken along lines  26 C- 26 C from  FIG. 26 ; 
         FIG. 26D  is an isometric view taken along lines  26 D- 26 D from  FIG. 26 ; 
         FIG. 27  is an electrical schematic of the structure of  FIG. 26 ; 
         FIG. 28  illustrates an isometric view of a hybrid feedthrough capacitor of the present invention; 
         FIG. 29  is a sectional view of a ground electrode plate taken along lines  29 - 29  of  FIG. 28 ; 
         FIG. 30  is a sectional view of a ground electrode plate taken along lines  30 - 30  of  FIG. 28 ; 
         FIG. 31  illustrates an isometric view of a feedthrough assembly having a bridge for an internal ground attachment and a gold pocket-pad for an external ground attachment to use with the capacitor of the present invention; 
         FIG. 32  is a top view of the structure of  FIG. 32  taken along lines  32 - 32 ; 
         FIG. 33  is a sectional side view taken along lines  33 - 33  from  FIG. 32 ; 
         FIG. 34  illustrates an isometric view of a feedthrough assembly having a peninsula for an internal ground attachment and a gold pocket-pad for an external ground attachment to use with the capacitor of the present invention; 
         FIG. 35  is a top view of the structure of  FIG. 34  taken along lines  35 - 35 ; 
         FIG. 36  is a sectional side view taken along lines  36 - 36  from  FIG. 34 ; 
         FIG. 37  is an isometric view of another embodiment of the present invention now having a leadwire comprised of different materials; 
         FIG. 38  is a sectional side view taken along lines  38 - 38  from  FIG. 37 ; 
         FIG. 38A  is similar to  FIG. 38  but is another embodiment of a leadwire comprised of different materials; 
         FIG. 39  is a sectional view of a feedthrough having a peninsula with a gold pocket-pad for an internally ground capacitor; 
         FIG. 40  is a sectional view similar to  FIG. 39  now having an internally ground capacitor placed thereon; 
         FIG. 41  is a sectional view similar to  FIG. 40  now showing an internally grounded capacitor grounded the oxide-resistant gold braze hermetic seal; 
         FIG. 42  illustrates a sectional side view of another embodiment of the present invention similar to  FIG. 41  now having an internally grounded capacitor that is ground to a gold pocket-pad along the ferrule perimeter; 
         FIG. 43  is very similar to  FIG. 42  but now uses an ACF film for making electrical connections; 
         FIG. 44  is an enlarged view taken along lines  44 - 44  of  FIG. 43 ; 
         FIG. 45  is an enlarged sectional view of the oxide-resistant (gold) pocket-pad of  FIG. 42 ; 
         FIG. 46A  is a sectional view of an embodiment of a ferrule perimeter or a ferrule edge having an oxide-resistant (such as gold) pocket-pad on the device side of a ferrule; 
         FIG. 46B  is a sectional view of an embodiment of a ferrule perimeter or a ferrule edge having an oxide-resistant (such as gold) pocket-pad on the body fluid side of a ferrule; 
         FIG. 46C  illustrates a top view of feedthrough having a rectangular ferrule and a perimeter pocket-pad and a cross-sectional view illustrating the ferrule height and the depth of the pocket; 
         FIG. 46D  illustrates a top view of a feedthrough having a discoidal ferrule with three pocket-pads and a cross-sectional view illustrating the ferrule height and the depth of the pockets; and 
         FIG. 47  is a chart detailing various solder compositions that may be used to attach to a ferrule pocket. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     In some of the following figure descriptions herein, reference axes are included to be helpful in understanding the present invention (see for example  FIG. 21 ). In particular these are orthogonal axes with an x, y and z axis shown in the figures to provide a reference for the reviewer for increased understanding of the present invention. As used herein, the z axis may also be referred to as the longitudinal axis. In cross-sections the axes will appear as either z, y or z, x axes views, which is consistent with isometric geometry. 
       FIG. 21A  illustrates a rectangular ferrule structure  112  for an AIMD that is typically made of titanium. As shown herein, the ferrule is without an insulator  160  and without leadwires  111 . There are four imaginary planes, as illustrated, extending upward above the ferrule  112 . These imaginary planes extend from the outermost perimeter edge of the ferrule and embody in the y-z axis, ferrule plane FP L1  and FP L2 . There are also two planes extending in the x-z plane and these are the ferrule with planes FP W1  and FP W2 . 
     Jumping ahead to  FIG. 21F , one can see that an insulator  160  of  FIG. 21D  is configured to be installed in the ferrule opening  306 . The insulator has four passageways that are also known as insulator via holes  316 . As shown, the insulator has a device side end surface  314  which is opposite the insulator body fluid side end surface  312 . 
       FIG. 21B  illustrates a modified ferrule  112 , as previously depicted in  FIG. 21A . There is a center line CL shown, with an arrow indicating the lateral direction. As can be seen, the lateral direction is perpendicular to the axis of the center line CL. A ferrule inner surface  307  is defined as shown. In this embodiment the inner surface  307  is relatively simply in shape, but it is understood by those skilled in the art that it could comprise numerous surfaces. A ferrule outermost surface  302 ,  304  is also indicated. It is understood that in one direction the outermost surface may be indicated as  302  and in a perpendicular direction the outermost surface may be indicated as  304 . Referring again to the ferrule outermost surfaces  302 ,  304 , one can see that ferrules often have complex shapes, including, in this case, surfaces  303  and  305 . For the purposes of the present invention, that which will be the outermost, meaning the surface of the ferrule that extends in the lateral direction furthest from the center line, is defined as the ferrule outermost surface  302 ,  304 . Accordingly, the surfaces  303  and  305  are not the outermost. A ferrule device side end surface  310  is also defined as shown. The ferrule side wall  309  is defined as including all of the projections and irregularities of the ferrule side wall which would include, in this case, the outermost surface  302 ,  304  and other features, such as  303  and  305 . In other words, the ferrule side wall  309  comprises the entire side wall and all of its features whether outermost or not. The ferrule also has a body fluid side end surface  308 , as shown. The ferrule also comprises a ferrule opening  306 , as shown. As is understood by those skilled in the art, the ferrule opening  306  is configured to receive an insulator structure  160 . Referring once again to  FIG. 21B , one will see that there is an imaginary projection  334  shown projected (perpendicular to surface  310 ) aligned with the ferrule outermost surface  302 ,  304 . This imaginary projection  334  is helpful in later figures to understand how a feedthrough capacitor will be disposed in an overhanging relationship to the ferrule. 
       FIG. 21C  is very similar to  FIG. 21B  but illustrates that ferrules  112  can take on various shapes. In this case, the ferrule outermost surface  302 ,  304  is not necessarily disposed contiguous with the ferrule device side end surface. Rather, the ferrule outermost surface  302 ,  304  is between surfaces  303  and  305 . Yet, the imaginary ferrule projection  334  is from the ferrule outermost surface  302 ,  304 , no matter where it occurs along the ferrule side wall  309 . It is also understood by those skilled in the art that ferrules are typically made of titanium and are always electrically conductive. However, other suitable materials for a ferrule are possible as this teaching is not limited to just a titanium ferrule. 
     The ferrule outermost surface  302  is defined herein as a first outermost surface but which can also be called a first outermost edge. Likewise, the ferrule outermost surface  304  is defined as a second outermost surface but which can also be called a second outermost edge. It is noted that the surfaces/edges  302  and  304  are perpendicular to each other in the case of a rectangular shaped ferrule. 
       FIG. 21D  shows an alumina ceramic insulator  160  that has been configured such that it will fit into the ferrule opening  306 , as previously described in  FIGS. 21A, 21B and 21C . In this particular case, the insulator has four passageways  316 . Referring now to cross-sectional view  21 E- 21 E taken from  FIG. 21D , one can see these passageways are active passageways meaning that they are going to receive terminal pins that pass from a body fluid side to a device side of the AIMD. Again, referring to  FIG. 21E , there is an active hole inner surface  318 , as shown. The insulator body fluid side end surface  312  is indicated and the insulator device side end surface  314  is also indicated. In general, when the insulator is installed in a ferrule  112  and the ferrule is installed in an AIMD housing  116 , the device end surface  314  will be the side that is directed toward the inside of the AIMD housing and the insulator body fluid side end surface  312  will be that side that is directed towards the body fluid side of the AIMD. 
       FIG. 21F  illustrates a rectangular quadpolar hermetic feedthrough  120 . One can see that there is a ferrule structure  112  that has been gold brazed  150  to a generally alumina ceramic insulator  160 . (The alumina ceramic insulator  160  was previously described in  FIGS. 21D and 21E .) There are also four leadwires (i.e. pins or leads)  111 ,  114  which are also gold brazed  162  to the alumina insulator  160 . It will be noted that the through-pins, which are solid conductors, are labeled  111  on the device side and  114  on the body fluid side. Accordingly, even those these leadwires are solid, they can be described as having a device side portion  111  and a body fluid side portion  114 . As used and defined herein, the word “portion” does not mean that a structure, such as a leadwire, has to have two different parts. Rather, it rather means that it has two different ends. However, as shown in later figures the leadwire itself may be made from differing materials to save cost. 
       FIG. 21F  also illustrates the feedthrough capacitor  132  coming down and being mounted “adjacent” the ferrule  112 , such that the feedthrough capacitor can be directly mounted onto one of the ferrule and/or the insulator, as previously illustrated in  FIG. 4  or it can be spaced away from one of the insulator and the ferrule with an insulative washer  212 , as previously illustrated in  FIG. 13 . The feedthrough capacitor  132  could even be spaced away from either the insulator or the ferrule by an air gap. As used herein, the word “adjacent” is not limited to touching, rather “adjacent” includes being right near and/or mounted directly onto a structure, being spaced from with an air gap or also spaced with a washer there between. 
     Referring once again to  FIG. 21F , the leadwires  111 ,  114  are also defined herein as comprising active conductive pathways that reside in and are hermetically sealed to the insulator  160 , in the at least one active insulator via hole  316 , as previously described in  FIG. 21D . Skipping ahead to  FIGS. 39-45 , the insulator structure  160  may comprise a ceramic reinforced co-sintered metal  185  with platinum co-sintered end caps  186 . The active conductive pathway residing in and hermetically sealed to the insulator need not always comprise a leadwire as shown in  FIG. 21F , but can comprise any of the structures, as defined in any of the drawings herein. 
       FIG. 22  illustrates a rectangular (or could be square, circular, rounded, oval or some combination thereof) feedthrough capacitor  132  mounted to the hermetic terminal feedthrough assembly  120  of  FIG. 21 . The feedthrough capacitor  132  has a unique geometry and for the first time, overhangs both sides of the ferrule in the x direction. However, in this embodiment the feedthrough capacitor is designed to not overhang the ferrule in the y direction. In fact, the y dimension of the feedthrough capacitor is specifically designed such that the electrical connection material  152  between the capacitor ground metallization  142  and the ferrule will hit the oxide-resistant exposed gold braze  150 , as illustrated. 
     Referring once again to  FIG. 22 , a global ground electrical connection  192  is defined. As defined herein, a ground electrical connection  192 , as illustrated in  FIG. 22 , may comprise a ground electrode plate set electrically connected to the capacitor ground metallization  142 . Then, either a thermal-setting conductive adhesive, or a solder or the like  152  is used to electrically connect the capacitor ground metallization  142  to the ferrule  112 . As previously discussed, ferrule structures  112  are typically of titanium and may be oxidized. Accordingly, in the present invention, the global electrical connection  192  would include connection to the hermetic seal of the gold braze  150 , as illustrated, which is an oxide-resistant and bio-stable surface. Alternatively, the global electrical connection may be to gold pocket-pads in the ferrule, as will be described in  FIGS. 23 and 23A  herein. The global electrical connection  192  may also comprise one or more internally grounded feedthrough passageways that will be described in detail herein, in  FIGS. 26 and 26A . 
     Again, the global use of the ground electrical connection or electrically conductive path  192  may include a hybrid grounded capacitor, as illustrated in  FIG. 28 , and is shown attached to a ferrule in  FIGS. 31 and 32 . This embodiment is known as a hybrid ground in that, one of the feedthrough capacitor passageways is grounded. In other words, attached electrically connected to the ground electrode plates and the ground electrode plates are also brought out to external metallizations. This hybrid grounding system globally is still called  192 , but combines exterior electrical metallizations, as well as a grounded passageway. 
     The novel configuration as illustrated in  FIG. 22  illustrates several important principles: 1) an oxide-resistant metal connection  152  is made between the ground metallization  142  of the feedthrough capacitor to the gold braze  150 ; and 2) in the x direction, the feedthrough capacitor is actually wider than the ferrule, which greatly increases the effective capacitance area (ECA) of each one of the four filter capacitors. The present invention results in an amazing increase of volumetric efficiency for the device. 
     Referring once again to  FIG. 22 , it is not really practical to reverse the geometry, that is, make the capacitor relatively thin in the x axis and overhanging the long in the y axis. The problem with this reversal is that the ECA of each of the four capacitors would be significantly reduced. It will be appreciated that this could be done under the present invention, but would not be a preferred embodiment. 
     A recent driving factor behind having a capacitor overhang in one axis (in this case, the x axis) and not overhang in the y axis has to do with the need for an oxide-resistant ground electrical connection  192  while at the same time, increasing the capacitor&#39;s ECA. As previously mentioned, with the number of leads constantly increasing, there is a constant need for improvements in volumetric efficiency, which increased ECA provides. Increasing the ECA also enables the use of lower k dielectrics, such as those taught by U.S. Pat. Nos. 9,764,129; and 10,092,749, the contents of which are included in full herein by reference. 
       FIG. 22A  is taken generally from section  22 A- 22 A from  FIG. 22 .  FIG. 22A  is sliced through the capacitor exactly along the perimeter edge (y-z plane) of the ferrule. This is why the ferrule is not shown cross-sectioned in  FIG. 22A . The internal electrode plates of the feedthrough capacitor  132  have been exposed, such that one can see the active electrodes  148  and the ground electrodes  146 , which run from one end of the capacitor to the other in the y direction and are connected to an external capacitor metallization  142 . One can also clearly see the electrical connection  152  between the capacitor ground metallization  142  and the gold braze of the hermetic seal. 
       FIG. 22B  is taken from section  22 B- 22 B of  FIG. 22 , which is very similar to  FIG. 22A , except this time, the section line, which is along the y axis, goes through two (C 3 , C 4 ) of the active leadwire or lead pins. One can see that there are two sets of active electrodes  148  and  148 ′, which are each conductively connected to the two associated leadwires. It will be understood that there are actually four sets of active electrode plates with two other sets being associated with the two other leads (C 1 , C 2 ) through which the section does not pass. Also shown is the ground electrode plate  146 , again, connecting from ground metallization  142  on each end of the capacitor. Referring once again to  FIGS. 22A and 22B , it will be appreciated that both ends of the capacitor ground metallization  142  are connected with an electrical connection material  152  to sections of the hermetic seal gold braze  150 , as illustrated. In this view, the metallization and gold braze is not shown on the insulator for simplicity. 
     Referring again to  FIG. 22B  and as defined herein, there is a first electrical connection material  156  that connects the active conductive pathway residing in the at least one active via hole in the insulator to the active metallization electrically connected to the at least one active electrode plate of the feedthrough capacitor. Also defined is a second electrical connection material  152  that electrically connects the capacitor ground metallization  142  connected to the at least one ground electrode plate of the feedthrough capacitor to the ferrule. These definitions do not mean that the electrical connection material  152  is connected only to the ferrule but can be connected to the ferrule through an intermediate material, such as a gold braze and the like, as previously described. 
       FIG. 22C  is taken from section  22 C- 22 C from  FIG. 22  and is a sectional view generally taken along the x axis through pins C 1  and C 4 . In this view, one can clearly see how the quadpolar feedthrough capacitor  132  overhangs the perimeter edges of the ferrule in the x direction. One can clearly see the active electrode plates  148 ′ and in this case,  148 ″, each associated with a leadwire  111 . 
       FIG. 22C  better illustrates two of the via holes in cross-section. One can see that the via holes  316  have an active via hole inner surface  318  as best seen in  FIG. 21E . This active via hole inner surface  318  might be sputtered (metallized) after the insulator  160  is sintered, such that there is an adhesion layer  153  and wetting layer  151  suitable to accept a gold braze. In other embodiments, the passageway  316  may be filled by a substantially pure platinum via or a ceramic reinforced metal composite, as will be further described herein. In these cases, the conductive via passageway  316  would be co-sintered at the same time as the alumina insulator  160 . 
     There is an active conductive pathway  320  that is formed through the insulator structure. This active conductive pathway can take the form of a leadwire, as illustrated in  FIGS. 4, 9, 13  or it may take the form of any of the substantially pure platinum or ceramic reinforced metal composite co-sintered vias, as illustrated in  FIGS. 39-45 . Referring now back to  FIGS. 22C, 22E, 22F and 22H to 22K , one can see that the feedthrough capacitor has a device side end surface  324  and a side of the capacitor  326  that is near or adjacent the ferrule. There is at least one active passageway  328  extending through the capacitor dielectric between the capacitor first and second surfaces  324  and  326 . It will be appreciated that this conductive passageway, in many embodiments, extends outwardly beyond either capacitor surface  324 ,  326  or both. Also, the conductive pathway may extend beyond at least one of the ferrule device side or the ferrule body fluid side or both. 
       FIG. 22D  is taken from  22 D- 22 D from  FIG. 22  and is very similar to  FIG. 22C , except in this case, it does not cut through any of the active leadwire pins. This sectional cut is also taken in the margin area between active electrodes  148 , such that none of the active electrodes are shown in  FIG. 22D . Accordingly, the only electrodes that we can see in this view are ground electrodes  146 . In  FIG. 22D , one can see one of the novel aspects of the present invention that is where the capacitor overhangs the ferrule and where the ground electrodes  146  do not need to extend to the outer edges of the feedthrough capacitor. These outer edges are the parts of the overhanging capacitor in the y-z plane that overhang the ferrule. 
       FIG. 22E  is a side view taken from isometric  22 E- 22 E from  FIG. 22 . This is not a sectional view but illustrates the overhanging capacitor  132 . As properly noted in  FIG. 22E , this is drawn in the x-z plane. The perimeter edge of the ferrule is illustrated by line A-A. Line A-A is best thought of as a plane that goes in and out of the paper along the perimeter edge of the ferrule, as illustrated. One can clearly see the present invention in  FIG. 22E , as the overhang  200 , which overhangs line A-A. As illustrated in  FIG. 22E , this overhang  200 ′,  200 ″ is on both sides. It will be appreciated that the overhang could be only on one side, but this would reduce the effective capacitance area of the two associated leadwires that are not on the overhanging side. 
       FIG. 22F  is another side view taken from isometric  22 F- 22 F from  FIG. 22 . Again, in this case, there is no cross-hatching, and this shows the side view taken in the y-z plane. Again, an imaginary line B-B is shown along the edge of the capacitor which could also be thought of as a plane extending into and out of the paper. Importantly, in accordance with the present invention, there is a setback (spaced inwardly)  201 ′ and  201 ″, as illustrated. As will be seen in every embodiment, the setback  201  also enables an oxide-resistant conductive connection to the ferrule. In summary, the  FIG. 22  series illustrates the present invention, in that, there is always a portion of the feedthrough capacitor perimeter that overhangs the ferrule (which increases the ECA) and there is also always a portion of the feedthrough capacitor perimeter that is setback (does not overhang) a portion of the ferrule perimeter or is aligned with the ferrule perimeter. In general, this setback area enables an oxide-resistant electrical connection generally to a gold or other noble surface. 
     Referring once again to  FIGS. 22E and 22F , one can see that there is a line C-C, which in both cases can become a plane by imagining it extended in and out of the paper. This is the plane between the capacitor  132  and the ferrule and insulator  112 ,  160 . It will be appreciated that the capacitor may lay directly against the insulator, the ferrule or both the insulator and the ferrule, or even that the capacitor may be spaced some distance away from the insulator and/or the ferrule by means of an adhesive washer, a spacer, an air gap or the like. Referring once again to  FIG. 22E , one will also appreciate that in the present invention, the capacitor overhang area  200  may coincide substantially with line or plane A-A. By aligning the capacitor overhang edge  200  with the perimeter edge of the ferrule A-A, one still gains a substantial amount of ECA. Importantly, it is still necessary to have a setback  201 , as illustrated in  FIG. 22F , so that one can accomplish an oxide-resistant electrical ground connection  152 . 
     Referring back to the imaginary projections of  FIG. 21A , the imaginary projection planes FPL 1 , FPL 2 , FPW 1  and FPW 2  onto the capacitor dielectric second end surface  326  defines: at least one capacitor dielectric imaginary first overhang portion  200 ′ or  200 ′ or both  200 ′ or  200 ′ extending laterally outwardly beyond the ferrule outmost surface  302 ; and a capacitor dielectric imaginary second overlay portion  203  that overlays the ferrule device side end surface and overlays the hermetically sealed insulator, wherein, at least part of the capacitor dielectric outer side wall in the capacitor dielectric imaginary second overlay portion is spaced inwardly  201 ′ or  201 ″ from the ferrule outermost surface  304  and wherein, the at least one ground electrode plate at least partially resides in the capacitor dielectric imaginary second overlay portion. 
       FIG. 22G  is very similar to  FIG. 22 , except that the feedthrough capacitor  132  only overhangs the ferrule  112  on one side, as illustrated. This is best illustrated in  FIG. 22H  where one can see that the feedthrough capacitor overhang portion  330  only overhangs on the right side of the ferrule and not the left side. 
       FIG. 22I  is essentially the same as  FIG. 22F , which illustrates that the feedthrough capacitor is spaced inwardly on both the right and the left sides from the ferrule outermost surface  304 . 
       FIG. 22J  is very similar to  FIG. 22H , except on the left side, the capacitor is aligned with the ferrule outermost surface  302 , as indicated. So, in this case, the capacitor is overhanging on the right side  330  and is aligned on the left side. 
       FIG. 22K  is exactly the same as  FIG. 22I  because from this perspective, they are both the same. 
       FIG. 22L  illustrates the active electrode plates of the capacitor illustrated in  FIGS. 22 and 22E . One can see that the active electrodes of all four of the quad polar capacitors are equal in this view. 
       FIG. 22M  illustrates the active electrodes of the feedthrough capacitor of  FIG. 22H  that only overhangs on one side. The overhang on the one side makes the active electrodes on that side much larger and hence the capacitor value is larger. By only overhanging on one side, however, the effective capacitance area where active electrode plates become smaller. Referring once again to  FIG. 22H , this means that the capacitors for the leadwires on the left is lower than the capacitance for the leadwires  111  on the right. 
       FIG. 22N  illustrates the active electrode plates taken from  FIGS. 22J and 22K . In this case, the four-quad polar leadwires are inline. Again, because the capacitor is overhanging on one side and not the other, this results in asymmetry of the active electrode plates, as indicated. This asymmetry is not a disadvantage in that, the effective capacitance area or electrode plate area is equal for all four of the active electrodes. 
       FIGS. 22O through 22W  indicate various alignments of the capacitor  132  (shown with a solid line) as it overlays the top view of the ferrule  112  (indicated by the dash lines). In accordance with the present invention, as illustrated in  FIG. 22O , the feedthrough capacitor need only overhang one side or portion of the ferrule. It is also important that the capacitor be set back or not overhang at least a portion of the ferrule. 
     In particular  FIG. 22R  illustrates perhaps the most likely form of the present invention wherein, the feedthrough capacitor overhangs opposite sides of the ferrule and is held back or set back from the other two sides of the ferrule. This allows for a proper ground attachment to a gold braze and in turn, to the ferrule while at the same time, allows for the resulting active electrode plates to all be equal and therefore, result in equal filter performance for each of the leads. Having equal filter performance on each of the leads is the common practice in the AIMD industry. 
       FIG. 23  is an isometric view of a hermetic seal subassembly  120  similar to that previously described in  FIG. 21F . As one can see, there is a gold braze  150  between ferrule  112  and insulator  160 . It will be appreciated that one can only extend this gold braze  150  outwardly so much before it would interfere with the can half clam shell mating structure  163 . One can see that four novel oxide-resistant gold-filled pockets  248  ( 250 ) have been formed. In general, these pockets are like little swimming pools that are machined or formed at the time that the ferrule  112  is formed. Then, at the same time that gold brazes  150  and  162  are formed, gold preforms  250  are reflowed, creating four oxide-resistant noble metal attachment surfaces. It is noted that the oxide-resistant gold-filled pockets of  FIG. 23  provides a ferrule gold pocket-pad; however, it is understood by one of skill in the art that the oxide-resistant material of the ferrule pocket-pad of  FIG. 23  may be selected from the group consisting of gold, platinum, palladium, silver, iridium, rhenium, rhodium, tantalum, tungsten, niobium, zirconium, vanadium, and combinations or alloys thereof. 
     Referring back to  FIG. 23 , it will be appreciated that the gold pocket-pads  248 ,  250  can be joined on each end into a trough into which a small diameter gold wire is placed prior to gold brazing. This is best illustrated in  FIG. 23A , which is taken from section  23 A- 23 A from  FIG. 23 . Shown is a small diameter gold wire  250  ready to be placed into an elongated gold pocket receptacle  248 . In general, gold braze  250  is reflowed at the same time that the hermetic seal gold brazes  150  and  162  are formed. Alternatively, wire  250  may comprise an oxide-resistant metal addition such as a brazed or laser welded gold, platinum, palladium, silver, and combinations thereof. Additionally, the wire  250  may further comprise a clip, a pad, an L-shaped pad, and an L-shaped pad with cutouts. Wire  250  may comprise any of the metal additions described in U.S. Pat. No. 9,931,514, the contents of which are incorporated fully herein by reference. 
       FIG. 23  was taken from FIG. 25 of U.S. patent application Ser. No. 15/943,998, the contents of which are incorporated in full herein. A major advantage of these pocket-pads is that much less gold braze is required to form the hermetic seal  150  between the ferrule  112  and insulator  160 . In addition, the gold pocket-pads are so thin that they can be placed right over the can capture area  163 . 
       FIG. 24  illustrates a quadpolar feedthrough capacitor  132  mounted to the hermetic seal with gold pocket-pads of  FIG. 23 . This allows the feedthrough capacitor to be wider CW 1 . In accordance with the present invention, the feedthrough capacitor  132  overhangs the outermost perimeter of the ferrule FW 1  as indicated. This is known as the capacitor overhang area. This capacitor overhang area is generally oriented in the x direction. When one looks at they direction, one will see that the capacitor  132  is setback from the edge of the ferrule perimeter. In other words, dimension CW 2  is either less than or substantially equal to FW 2 . In summary, in accordance with the present invention, the feedthrough capacitor of  FIG. 24  overhangs in the x direction and is setback (or aligned) in the y direction. Also, in accordance with the present invention, an oxide-resistant electrical connection  142  is made between the feedthrough capacitor ground metallization  142  and each of the four gold pocket-pad  248 ,  250  as indicated with electrical connection material  152 . It will be appreciated that the number of gold pocket-pads can be increased, decreased or even merged together. It will also be appreciated that the electrical connection material  152  can comprise thermal-setting conductive adhesive, a solder, a braze or the like. 
       FIG. 24A  is taken from section  24 A- 24 A from  FIG. 24 .  FIG. 24A  illustrates that the feedthrough capacitor  132  is setback on both of its sides from the ferrule width FW 2 . This is also illustrated in  FIG. 24B . 
       FIG. 24C  is a side view taken from  24 C- 24 C from  FIG. 24 . This is very similar to  FIG. 22E , except that the electrical connections are to the gold pocket-pads and not to the hermetic seal gold braze. 
       FIG. 24D  is a side view taken from  24 D- 24 D from  FIG. 24 . This figure is very similar to  FIG. 22F  and illustrates that the capacitor is setback in its width from the ferrule. In summary,  FIG. 24C  illustrates the side (pictorial) view in the x-z plane clearly illustrating that the feedthrough capacitor  132  overhangs  200  ferrule  112 . As mentioned in  FIG. 24D , the capacitor can be substantially aligned with the edge of the ferrule or setback  201 , as illustrated. 
       FIG. 25  is an internally grounded capacitor with a ferrule peninsula  139 . An internally grounded capacitor with a ferrule peninsula is taught in FIGS. 11a, 11b and 11c in U.S. patent application Ser. No. 15/863,194, the contents of which are incorporated herein fully be reference. Referring back to  FIG. 25 , one can see that in the x-z direction, the feedthrough capacitor  132  overhangs the ferrule  112 . 
     This is best illustrated in  FIG. 26 , where one can see the feedthrough capacitor mounted to the ferrule, wherein the feedthrough capacitor clearly overhangs the width of the ferrule in the x-z plane. It will also be noted that this feedthrough capacitor, since it is internally grounded, has no external or perimeter electrical metallization or electrical connection to the ferrule. The entire grounding of the feedthrough capacitor internal ground electrodes are through internal ground leadwire  111   gnd . Accordingly, the feedthrough capacitor is also not constrained in the y-z orientation either. In this case, the feedthrough capacitor is shown nearly aligned with the outermost edge of the length of the ferrule and overhang substantially along the width of the ferrule. 
       FIG. 26A  is taken from section  26 A- 26 A from  FIG. 26 .  FIG. 26A  is drawn in the x-z plane clearly showing how the internally grounded feedthrough capacitor  132  overhangs the widest width of the ferrule  112 .  FIG. 26A  is sectioned through one of the active pins  111  and shows that it is electrically connected  156  to active metallization  144 , which is connected to its active electrode plates  148 , as shown. 
       FIG. 26B  is taken from section  26 B- 26 B from  FIG. 26  and is very similar to  FIG. 26A , except that this is sectioned through the ground pin  111   gnd . One can see that the ground pin is gold brazed  150 ′ into the ferrule  122  peninsula structure  139  as indicated.  FIG. 26B  also shows that the ground pin  111   gnd  is connected to the corresponding set of capacitor ground electrode plates  126 . 
       FIG. 26C  is very similar to  FIGS. 26A and 26B  and is taken generally from section  26 C- 26 C from  FIG. 26 . In this case, the sectioning is through ground pin  111   gnd . In this embodiment, instead of a ferrule peninsula, there is a ferrule bridge, as now illustrated. Referring back to  FIG. 26 , the bridge concept for an internal ground pin is illustrated in FIG. 40 of U.S. Pat. No. 6,765,780, the contents of which are incorporated herein fully be reference. 
     It is noted that  FIGS. 26B and 26C  are only exemplary and are in no way intended to be limiting. For example, in both  FIGS. 26B and 26C , instead of ground pin  111   gnd  electrically connected to the ferrule  112  by gold braze  150 ′, a gold pocket-pad may be alternatively formed in the peninsula or the bridge structure of the ferrule  112  to make the electrical connection. An electrical connection to the metallization of the via of the feedthrough capacitor  132 ′ (or alternatively the via of the filter capacitor may be an electrically conductive filled via) and to the gold pocket-pad (not shown) can then be made using an electrical connection material  152 , which may comprise a solder, a thermal-setting conductive adhesive, an ACF film, a braze, a laser weld among others. 
     In the case of a solder, two commonly available solders that may be used include, but are not limited to, AG1.5, which consists of 97.5% lead, 1% tin and 1.5% silver, and SN10, comprising 10% tin, 88% lead and 2% silver. Additional solders are shown in the chart of  FIG. 47 , which provides exemplary non-limiting solder compositions that may be used by one skilled in the art when attaching to the ferrule pocket. Solders may alternately be in the form of a ball grid array (BGA). Ductile solders are preferable to limit thermal shock to, for example, a filter capacitor, an EMI filter circuit board, an AIMD circuit board, other AIMD circuitry, sensors, identification components, RFID chips or the like. 
     The thermally conductive adhesive may comprise a conductive polymer, a conductive epoxy, a conductive silicone, or a conductive polyimide, such as those manufactured by Ablestick Corporation. As use herein, the term “ACF film” is used generally to include a family of anisotropic conductive materials, which comprises an Anisotropic Conductive Adhesive (ACA), an Anisotropic Conductive Film (ACF), an Anisotropic Conductive Paste (ACP), an anisotropic conductive tape, an anisotropic conductive epoxy, and combinations thereof. The ACF film may also be in the form of an ACF film BGA. 
     In the case of a braze, it will be understood by those skilled in the art that the braze material used to practice the embodiment of  FIG. 26B , which electrically connects an EMI filter to a hermetic feedthrough, requires low temperature braze materials (&lt;850° C.). For example, biocompatible gold alloy braze materials, such as, but not limited to, 82Au-18In (530° C.) and 88Au-12Ge (356° C.) may be used. Gold alloy brazes comprising more than 50% gold by weight are particularly helpful when attaching filter capacitors to feedthroughs, as higher gold content (&gt;50%) provides favorable elasticity (that is, adequate ductility) to the electrical connection, which compensates for differences in thermal expansion coefficient between the filter capacitor and the feedthrough that can fracture or even detach the filter from the feedthrough during AIMD assembly processes, for example, laser welding the ferrule of the hermetic terminal to an opening of an AIMD housing. 
     It is noted that solders, thermal-setting conductive adhesives, ACF films, and brazes can also be used to make connections to the ferrule that are characterized as both electrical and mechanical connections. When a connection, however, is solely mechanical (physical connections only without any need for electrical conduction), then non-electrically conductive thermal-setting adhesives, films, tapes, or low electrical conductivity solders and brazes may be used. 
     Further regarding brazing to a pocket-pad of a ferrule, when exposure to body fluid is negligible or unlikely (such as when the electrical connection is inside the device), other braze alloys may be used. For example, alloys that could be used include (by weight percent): CuSiI—copper/silver (28/72)—MP 780° C., indium/copper/silver (10/27/63)—MP 685-730° C., gold/nickel (82/18)—MP 950° C., nickel/gold/copper (3/35/62)—MPI000-1030° C., gold/nickel/titanium compositions including those disclosed in U.S. Pat. No. 4,938,922, the contents of which are fully incorporated herein by reference, Johnson Matthey silver-copper eutectic and pure metal brazes, Pallabraze alloys and Orobraze alloys. 
     The best control of braze volumes in the pocket of the ferrule is achieved by using die cut braze performs; however, a braze ring can also be made by cutting loops of wire from a wrapped coil typically provided on a mandrel. Such braze rings may require flattening and/or squeezed to close any cutting gap in the ring. 
     Braze preforms may also be manufactured from nano-material particles. For example, gold particle sizes less than about 5 mm allow melting temperatures of 700° C. or less depending on uniformity of size and size distribution of the particles. It is understood by one skilled in the art that the smaller the particle size, the lower the melting temperature of the braze material. It is also understood by one skilled in the art that the melting temperature of a braze material comprising nano-particles can be customized based on optimal particle size selection, mixing and preform manufacturing. For example, the melting temperature of a nanoparticle is a function of its radius of curvature, hence, large nanoparticles melt at greater temperatures due to their larger radius of curvature. One way to optimize particle size in order to customize melting temperature is to use liquid shell nucleation (LSN) modelling, which predicts that a surface layer of atoms melts prior to the bulk of a particle. The LSN model calculates melting conditions as a function of two competing order parameters using Landau potentials. One order parameter represents a solid nanoparticle, while the other represents the liquid phase. Each of the order parameters is a function of particle radius. The parabolic Landau potentials for the liquid and solid phases are calculated at a given temperature, with the lesser Landau potential assumed to be the equilibrium state at any point in the particle. In the temperature range of surface melting, the results show that the Landau curve of the ordered state is favored near the center of the particle while the Landau curve of the disordered state is smaller near the surface of the particle. The Landau curves intersect at a specific radius from the center of the particle. The distinct intersection of the potentials means that LSN predicts a sharp, unmoving interface between the solid and liquid phases at a given temperature. The exact thickness of the liquid layer at a given temperature is the equilibrium point between the competing Landau potentials. The equation below provides the condition at which an entire nanoparticle melts according to the LSN model. 
     
       
         
           
             
               
                 
                   T 
                   M 
                 
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                   ( 
                   d 
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                     4 
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                       T 
                       MB 
                     
                   
                   
                     
                       H 
                       f 
                     
                      
                     d 
                   
                 
                  
                 
                   ( 
                   
                     
                       
                         σ 
                         SV 
                       
                       
                         1 
                         - 
                         
                           
                             d 
                             0 
                           
                           d 
                         
                       
                     
                     - 
                     
                       
                         σ 
                         lv 
                       
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                         ( 
                         
                           1 
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                               ρ 
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             , 
           
         
       
     
     where: T MB =bulk melting temperature
         H f =bulk heat of fusion   d=particle diameter   d 0 =atomic diameter   σ sv =solid-vapor interface energy   σ lv =liquid-vapor interface energy   ρ s =density of the solid   ρ l =density of the liquid       

     If braze rings are made from coiled wire, it is understood by one skilled in the art that a fine gold wire is a preferable starting material, as melt temperature control is based on wire diameter and grain size. The smaller the diameter and/or grain size, the lower the melting temperature. Fine gold wire may comprise nanowires with the diameter of the nanowire on the order of a nanometer (10 −9  meters), or which can alternately be defined as the ratio of the length to the width being greater than 1000. Ultra-fine wire is defined as anything below 0.002 inch (0.05 mm) in diameter. Fine wire is defined as having a diameter that ranges between 0.002 inch (0.05 mm) and 0.005 inch (0.127 mm) in diameter. Grain size is a particularly important aspect for wires used to make braze rings, as grain size can significantly affect melt temperature. For examples, studies have shown that there is a linear relation between the melting point and the reciprocal grain size of a metal with larger grain size samples, for example larger than about 7 nm, which is similar to the observations of nanoparticles. However, at a small grain size, this relation between grain size and melting temperature is broken. In particular, at grain sizes below 4 nm, the melting point is found to be approximately constant. 
     Brazing methods for electrical and/or mechanical connection to a ferrule may comprise: multi-stage brazing, active metal brazing, reactive brazing, transient liquid phase bonding, or other similarly suitable techniques. 
       FIG. 26D  is taken from section  26 D- 26 D from  FIG. 26  and illustrates an active pin and an insulator  160 ′ that is either a fusion glass, a compression glass or a glass ceramic. In this case, there is no need for a gold braze between the ferrule and the insulator. 
       FIG. 27  is an electrical schematic diagram of the feedthrough capacitor filter of  FIG. 26 , which illustrates that the ground pin  111   gnd  only extends to the device side (not to the body fluid side). Active pins  111   a  through  111   h  are illustrated, each associated with its own individual feedthrough capacitor. In addition, a telemetry pin T is illustrated, which cannot be filtered. If the telemetry pin were filtered, then it would not be possible to transmit RF telemetry signals back and forth from the device. 
       FIG. 28  illustrates a hybrid feedthrough capacitor, which is best understood by looking at its ground electrode plates in  FIG. 29  and its active electrode plates in  FIG. 30 . Ground electrode plate in  FIG. 28 , which is taken from section  29 - 29  from  FIG. 28 . This illustrates a ground electrode that is grounded to a center hole  111   gnd  and also at its ends, as illustrated. The ends of the capacitor ground electrodes are terminated in capacitor metallization  142 . There are eight active electrodes forming eight different capacitors, as illustrated in  FIG. 30 .  FIG. 30  is taken generally from section  30 - 30  from  FIG. 28 . The active electrodes  148  are all the same size, which would mean that all of the capacitances were of equal value. It is known to those skilled in the art to vary the active areas if different capacitance were required. 
       FIG. 31  illustrates a hermetic seal terminal subassembly  120  that has been prepared for mounting of the feedthrough capacitor of  FIG. 28 . One can see a center ground pin  111   gnd , which is laser welded to gold braze  150 ′ to the ferrule structure  112 . In addition, there are gold pockets-pads  248 ,  250 . On the left-hand side, these are shown as two discrete pockets and on the right-hand side, this is shown as one continuous pocket. The feedthrough capacitor  132  of  FIG. 28  is defined herein as a hybrid internally grounded capacitor, in that, it has both an internal ground passageway and also grounded end metallizations. Hybrid capacitors are taught by U.S. Pat. No. 6,765,780, the contents of which is fully incorporated herein with this reference. As previously noted for  FIGS. 26B and 26C , the ground pin  111   gnd  may alternately be an oxide-resistant pocket-pad  250 . All of the related structure, materials and methods disclosure also apply. 
     Referring back to  FIG. 31 , the gold pocket-pads  250  are optional, in that, if the capacitor was made shorter, an electrical contact  152  could be made to the gold braze  150  of the hermetic seal. However, as illustrated, the gold pocket pads allow the capacitor to be a little longer and extend over complex ferrule areas, including ferrule capture areas  163 . These multipart pins are taught by U.S. patent Serial Nos. 15/844,683 and 15/603,521, the contents of which are incorporated herein fully be reference. 
       FIG. 32  illustrates the hybrid capacitor  132  of  FIG. 28  mounted to the feedthrough hermetic seal subassembly  120  of  FIG. 31 . In accordance with the present invention and as illustrated in  FIG. 32 , the width of the feedthrough capacitor  268  overhangs the widest dimension of the ferrule  266 . Also in accordance with the present invention, the length of the feedthrough capacitor  272  is setback (it is shorter) from the overall length or the greatest length of the ferrule  270 . Accordingly, the capacitor perimeter width surfaces  252  overhang the ferrule in accordance with the present invention. 
       FIG. 33  is taken from section  33 - 33  from  FIG. 32  and shows the overhanging capacitor in sectional view.  FIG. 33  is taken in the y-z plane and illustrates that the capacitor sets back (does not overhang) the widest dimensions of the ferrule  112 . Referring once again to  FIG. 33 , one can clearly see the electrical connection  152  between the internally grounded hybrid feedthrough capacitor ground metallization  142  and gold pocket-pads  250 . In  FIG. 33 , one can also see ground pin  111   gnd , which has been gold brazed  150 ′ into ferrule bridge  141 . As previously noted for  FIGS. 26B and 26C , the ground pin  111   gnd  may alternately be an oxide-resistant pocket-pad  250 . All of the related structure, materials and methods disclosure also apply. This type of hybrid grounding, using both the end metallizations  142  and the ground pin  111   gnd  is very important, such that proper filter performance be maintained on every one of the active pins. This capacitor is too long to depend only on grounding by the centered pin  111   gnd . Undue inductance and resistance could build up along the ground electrode plates, meaning that the furthest left and furthest right pins would have seriously degraded insertion loss (attenuation). In accordance with the hybrid concept, what results is a multi-point ground system, which means that each pin is an effective EMI filter. Hybrid internally grounded capacitors are taught by U.S. Pat. No. 6,765,780, the concepts of which are incorporated fully herein by reference. 
     Referring to  FIG. 34 , one will notice that the gold pocket-pads  248 ,  250  have been eliminated. In this case, the capacitor length is aligned so that an electrical connection can be made from the capacitor ground metallization  142  directly to the gold braze of the hermetic seal between the insulator  160  and ferrule  112 . 
       FIG. 35  is a top view of the capacitor mounted onto the hermetic terminal subassembly of  FIG. 34 . In accordance with the present invention, one can see that the overall length  272  of the hybrid internally grounded feedthrough capacitor  132 ″ is shorter (has a setback) compared to the greatest overall length of the ferrule  270 . Also in accordance with the present invention is the hybrid internally grounded feedthrough capacitor  132 ″ is wider in its width than the greatest width  266  of the ferrule  266 . The greatest width  266  of the ferrule is also known as the furthermost width of the ferrule. As illustrated in  FIG. 34 , ferrules  112  often have irregular dimensions, so it is important that when we refer to capacitor overhang or capacitor setback, we are always referring to the greatest width or the greatest length of both an irregularly shaped ferrule and/or a regularly shaped (symmetrical) ferrule. 
       FIG. 36  is a cross-sectional view taken from section  36 - 36  from  FIG. 35 . This illustrates the centered ground pin  111   gnd  which has been gold brazed or laser welded  150 ′ into the ferrule peninsula structure  139 . As previously noted for  FIGS. 26B and 26C , the ground pin  111   gnd  may alternately be an oxide-resistant pocket-pad  250 . All of the related structure, materials and methods disclosure also apply. The hybrid ground connections are also shown in the capacitor ground terminations  142  are shown electrically connected  152  to ferrule gold braze  150 . As previously described, this multi-point grounding system assures a high level of filtering performance for each of the active pins. 
       FIG. 37  is a quadpolar capacitor somewhat similar to that illustrated in  FIGS. 21 and 22 . As illustrated, it has an overhang and also a setback in accordance with the present invention. Another distinguishing feature is revealed in  FIG. 38 , which is taken from section  38 - 38  from  FIG. 37 . On the left-hand side of the sectional view, one can see that the device side leadwire  111  has been segmented (complete wire segment  117 ). Leadwire segment  117  has been co-brazed along with body fluid side lead  114 ′. This is defined herein as a two-part pin. The right-hand side of  FIG. 38  illustrates that the body fluid side pin  114  extends all the way through the hermetic insulator and halfway through the feedthrough capacitor. In both the left and right-hand side embodiments, there is a low-cost pin  111 , which is typically of tin copper, which is co-joined and soldered approximately halfway through the feedthrough capacitor. This type of two-part or three-part pin construction greatly reduces cost because in the prior art, it was typical to take non-toxic and biocompatible leadwires, such as platinum or palladium leadwires and run them all the way through the structure. There is no need on the device side to have biocompatible materials. 
     Referring back to  FIG. 38 , on the left-hand side, we have a co-brazed pin, which is further described by U.S. Pat. No. 10,272,252, the contents of which are incorporated herein fully by reference. On the right-hand side of  FIG. 41 , we have a two-part pin co-joined in the feedthrough capacitor that is described by U.S. Pat. No. 10,319,859, the contents of which are also fully incorporated herein by reference. 
       FIG. 38A  is substantially the same as  FIG. 38 , except in this case, the two-part lead connection is disposed inside the inside insulator passageway, as illustrated. In this case, the two-part lead  111 ′,  114  is joined by co-brazing the leads. Two-part pins, as illustrated in  FIG. 38A , are more thoroughly described in U.S. Pat. No. 10,272,252, the contents of which are herein incorporated by reference. 
       FIG. 39  illustrates a cross-section of a hermetic terminal subassembly with a peninsula with a gold pocket-pad  250 . It also illustrates that instead of a leadwire pin, a conductive pathway passes through the insulator. In this case, the conductive pathway consists of a ceramic reinforced metal composite material  185  with pure platinum end caps  186 . Referring to  FIGS. 39-45 , composite reinforced metal ceramic (CRMC) co-sintered vias are more fully described in U.S. Pat. No. 10,249,415, the contents of which are incorporated herein fully be reference. CRMC vias are also described in U.S. Pat. Nos. 8,653,384; 8,938,309; 9,233,253; 9,352,150; 9,492,659; or 9,889,306, the contents of all of which are incorporated herein fully be reference. It is noted that, while  FIG. 39  shows active CRMC co-sintered vias  186 ,  320  in the insulator  160  of the terminal feedthrough assembly  120 , any of the active leadwires  111  previously shown may alternately comprise active CRMC co-sintered vias  186 . Similarly, while an oxide-resistant gold pocket-pad  250  is shown in a peninsula of the ferrule  112 , it is understood that the oxide-resistant gold pocket-pad  250  may reside on one of a ferrule perimeter, a ferrule edge, a ferrule peninsula, a ferrule bridge, or combinations thereof. Additionally, while the figures show attachment of EMI filters, EMI filters are only exemplary. It is anticipated that the oxide-resistant gold pocket-pad  250  of the present invention can also be used to electrically and mechanically connect an EMI filter circuit board, an AIMD circuit board, other AIMD circuitry, sensors, identification components, RFID chips or the like in addition to EMI filter capacitors to a ferrule of a hermetic terminal. Any of the above components may be overhanging the ferrule according to device design and/or application needs. Attachment structures, connection materials, and methods previously disclosed also apply. 
       FIG. 40  illustrates an internally grounded feedthrough capacitor  132 ′ of the present invention mounted to the hermetic terminal and substantially overhanging the ferrule  112 . This overhang is in the x-z axis. Not shown is the sectional view from the side showing the length of the feedthrough capacitor and the length of the ferrule, but it will be appreciated that the capacitor does not overhang in the y-z axis, but it is either setback or aligned with the ferrule edge as has been previously described. 
       FIG. 41  is substantially the same as  FIG. 40 , except in this case instead of gold pockets, the ground electrical connections from the two ground pins  119   gnd  are directly to the hermetic seal gold braze  150  by way of  202   gnd , which can be a solder, a thermal-setting conductive adhesive, ACF film or the like. Again, in accordance with the present invention, the feedthrough capacitor  132 ′ overhangs the ferrule in the x-z plane. 
       FIG. 42  is similar to  FIG. 40  illustrating the present invention with an internally grounded feedthrough capacitor  132 ′ along with multiple connections to gold pockets  250  and  250 ′ In accordance with the present invention, the internally grounded feedthrough capacitor  132  overhangs the widest width of the ferrule  112  in the x-z plane. 
       FIG. 43  is very similar to  FIGS. 41 and 42 , except that in this case, ACF films are used to make the electrical connection  260  and a nail-headed ground leadwire  111   gnd , as illustrated. The ACF films referred to include a family of anisotropic conductive materials, which comprise an Anisotropic Conductive Adhesive (ACA), an Anisotropic Conductive Film (ACF), an Anisotropic Conductive Paste (ACP), an anisotropic conductive tape, an anisotropic conductive epoxy, and combinations thereof. The ACF film may also be in the form of an ACF film BGA. It will be appreciated that in addition to ACF films, BGA solder bumps or BGA thermal-setting epoxy bumps could also be used. It is also appreciated that instead  202  of FIG.  40 , the ACF film of  FIG. 43  may be used instead. Additionally, instead of  202   gnd  of  FIGS. 41 and 42 , the ACF film of  FIG. 43  may be used instead. 
       FIG. 44  is a close-up taken from section  44 - 44  from  FIG. 43  illustrating compression of the ACF film conductive particles  262 ′ in the electrical connection area. The freely suspended particles  262  are insulated from each other providing conductivity only on the area of the nail head  111   gnd  nail head  260  and gold pocket area  250  of ferrule  112 . 
       FIG. 45  is an enlarged sectional view of the gold pocket-pad  250  of  FIG. 42 , which resides along the perimeter of the ferrule  112 . It is understood that the gold pocket-pad  250  of  FIG. 45  may reside on one of a ferrule perimeter, a ferrule edge, a ferrule peninsula, a ferrule bridge, or combinations thereof. The gold pocket-pad  250  comprises an electrical connection material  202   gnd , which, as previously disclosed, may comprise one of a solder, a thermal-setting conductive adhesive, an ACF film, among others. 
       FIGS. 46A and 46B  are sectional views of embodiments of a ferrule  112 , wherein the ferrule comprises a recessed pocket  248 , the recessed pocket  248  comprising a pocket-pad  250  nested therein. It is appreciated (but not shown) that the pocket-pad  250  may be mechanically and/or electrically connected to the recessed ferrule pocket  248  by one of a solder, a thermal-setting conductive adhesive, an ACF film, or a braze, a laser weld or the like. The solders, thermal-setting conductive adhesives, ACF films, and brazes previously disclosed for  FIGS. 26B and 26C  apply to  FIGS. 46A and 46B . Optionally, the pocket-pad  250  may be partially proud of the ferrule surface, particularly when needed for compression of ACF film conductive particles or spheres. 
       FIGS. 46A and 46B  show that the pocket-pad  250  is formed on a perimeter or an edge of the ferrule  112 ; however, it is understood that the pocket-pad  250  may also be formed on a peninsula or a bridge of a ferrule as previously disclosed.  FIG. 46A  shows a pocket-pad  250  on the ferrule device side while  FIG. 46B  shows a pocket-pad  250  on the ferrule body fluid side. The pocket-pad  250  of  FIGS. 46A and 46B  further comprises a connection material  200 ,  202   gnd , which, as previously disclosed, may comprise one of a solder, a thermal-setting conductive adhesive, an ACF film, among others. The connection material  202 ,  202   gnd  may be used to make either a mechanical connection or an electrical connection to the ferrule  112 . The electrical connection to the ferrule  112  may further be a ground electrical connection to a circuit of an AIMD, such as, but not limited to, an AIMD circuit board or an EMI filter circuit board. The ground electrical connection may further be internal to the AIMD, such as to an EMI filter capacitor, an EMI filter circuit board, an AIMD circuit board, other AIMD circuitry, sensors, identification components or devices, RFID chips, and the like. The ground electrical connection may alternatively be external to the AIMD, such as to a header block, a sensor, an identification component or device, an RFID chip, a telemetry antenna, and the like. As previously disclosed, the pocket-pad  250  may comprise a connection material  202 ,  202   gnd , the connection material  202 ,  202   gnd  comprising one of gold, platinum, palladium, silver, iridium, rhenium, rhodium, tantalum, titanium, tungsten, niobium, zirconium, vanadium, and alloys or combinations thereof. The connection material  202 ,  202   gnd  may alternatively comprise titanium alloys, for example, but not limited to, titanium-aluminum-vanadium, titanium-platinum, titanium-niobium, titanium-gold, among others. The connection material may further comprise an oxide-resistant material. The oxide-resistant material may comprise gold alloys, for example but not limited to, gold-platinum, gold-palladium, gold-iridium, gold-silver, gold-niobium, gold-rhenium, gold-rhodium, gold-titanium, among others. The oxide-resistant material may alternatively comprise platinum alloys, for example, but not limited to platinum-iridium, platinum-gold, platinum-silver, platinum-niobium, platinum-rhenium, platinum rhodium, among others. The oxide-resistant material may alternatively comprise palladium alloys, for example, but not limited to palladium-platinum, palladium-iridium, palladium-gold, palladium-silver, palladium-niobium, palladium-rhenium, palladium-rhodium, among others. It is understood that any of the connection materials may be used on the device side of the AIMD; however, only oxide-resistant, biocompatible and non-toxic connection materials may be used on the body fluid side of the AIMD. 
       FIG. 46C  illustrates a feedthrough comprising a rectangular-shaped ferrule  112  with a recessed perimeter pocket  248  and pocket-pad  250  disposed therein. The cross-sectional view C-C of  FIG. 46C  shows the height h of the ferrule, which extends to a ferrule first side end surface and a ferrule second side end surface. The cross-sectional view C-C also shows the depth d of the recessed pocket  248 , which extends from a ferrule first side end surface toward the ferrule second side end surface, or from the ferrule second side end surface toward the ferrule first side end surface. While a full perimeter pocket  248  and pocket-pad  150  is illustrated (the at least one recessed pocket is a continuous recessed pocket surrounding the ferrule opening and the oxide-resistant pocket-pad is nested in the continuous recessed pocket), it is understood by one skilled in the art that the recessed pocket  248  and pocket-pad  150  may be discontinuous or a partial pocket  248  and associated pocket-pad  150 . A partial pocket  248  and pocket-pad  150  may, for example, be provided on one or more edges of a rectangular or square ferrule or may be provided as a semicircle or an arc perimeter pocket-pad on a discoidal ferrule. 
       FIG. 46D  illustrates a feedthrough comprising a discoidal-shaped ferrule  112  with three recessed pockets  248  and associated pocket-pads  150  at circumferentially spaced locations one from another, thereby providing 360° of connectability to the ferrule. Such a 360° circumferential configuration also provides selective connectability options to the ferrule. Connections can be made to one, two or all three pocket-pads. Each connection may be to a single component of the AIMD, or, alternatively, a different component of the AIMD may be connected to each pocket-pad provided on the ferrule. For example, one pocket pad  250  may be connected to an EMI filter capacitor, a second pocket-pad  250  may be connected to a circuit board and a third pocket-pad  250  may be connected to an RFID chip. It is understood by one skilled in the art that, while the pocket-pads  250  of  FIG. 47  are shown on the first side of the ferrule of the feedthrough, one or more pocket-pads may also be provided on the second side of the ferrule of the feedthrough. It is also understood by one skilled in the art that a plurality or ‘n’ number of recessed pockets  248  and associated pocket-pads  150  may be provided at spaced locations about the ferrule opening on one of the first side, the second side or both the first and second sides of the ferrule. 
     The cross-sectional view D-D of  FIG. 46D  illustrates that the recessed pocket  248  of the pocket-pads  250  may be configured differently. The cross-sectional view D-D also shows that the pocket-pad  250  may be partially proud of a ferrule side end surface. Two non-limiting examples are shown on the right and left sides of the cross-section of  FIG. 46D . The left side pocket  248  has a rectangular-shape in cross-section with 90° corners and the right-side pocket is a cup-shaped semi-circular pocket  248 . Any pocket shape may be provided to facilitate connection, including lock and key type configurations. The cross-sectional view D-D of  FIG. 46D  also shows the height h of the ferrule, which extends to a ferrule first side end surface and a ferrule second side end surface. The cross-sectional view D-D also shows the depth d of the recessed pocket  248 , which extends from a ferrule first side end surface toward a ferrule second side end surface, or from the ferrule second side end surface toward the ferrule first side end surface. 
       FIG. 47  is a chart of various solder materials that may be used to make attachments to any of the ferrule  112  pocket-pad  250  embodiments disclosed herein. The solder compositions listed in the chart of MG.  47  reflect element weight percents, are exemplary only and are not meant to be limiting. 
     Although several embodiments of the invention have been described in detail, for purposes of illustration, various modifications of each may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited, except as by the appended claims.