Patent Publication Number: US-11647341-B2

Title: Hearing aid for placement in a user&#39;s ear canal

Description:
RELATED APPLICATION DATA 
     This application is a continuation of U.S. patent application Ser. No. 16/823,297 filed on Mar. 18, 2020, which claims priority to, and the benefit of, U.S. Provisional Patent Application No. 62/946,964, filed Dec. 11, 2019. The entire disclosures of the above applications are expressly incorporated by reference herein. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to a hearing aid for placement in a user&#39;s ear canal, a charging station and a method of producing a charging station. More specifically, the disclosure relates to a hearing aid for placement in a user&#39;s ear canal, a charging station and a method of producing a charging station as defined in the introductory parts of the independent claims. 
     BACKGROUND ART 
     Custom hearing aids are hearing aids molded specifically for the ear canal of the specific user. The customized shell means that the internal volume of the hearing aid will be different for each hearing aid, which in turn means that the internal placement of components can be a difficult three-dimensional puzzle to solve. 
     SUMMARY 
     It is an object of the present disclosure to mitigate, alleviate or eliminate one or more of the above-identified deficiencies and disadvantages in the prior art and solve at least the above-mentioned problem. 
     In one aspect, one or more of the above objects are achieved by means of a hearing aid, as claimed in the associated independent claim, preferred variants thereof being defined in associated dependent claims. 
     According to a first aspect there is provided a hearing aid for placement in a user&#39;s ear canal, the hearing aid having a proximal end and a distal end, the proximal end being the end of the hearing aid that is inserted into the user&#39;s ear canal and facing the tympanic membrane when inserted, the distal end being the opposite end, the hearing aid comprising a shell customized for the user&#39;s ear canal, the shell comprising an inner space configured for at least partly receiving a rechargeable battery, a charging arrangement, at least one microphone arrangement, and an integrated circuit, a faceplate comprising an upper face and a lower face and a circumference, the upper face being exposed at the distal end of the hearing aid when the shell is placed in the user&#39;s ear canal, the faceplate being configured for closing the inner space of the shell, wherein the integrated circuit is arranged between the faceplate and the proximal end, the charging arrangement being situated at the distal end of the hearing aid and the battery being situated between the integrated circuit and the proximal end. 
     According to some embodiments, the charging arrangement and at least one microphone arrangement are produced as one module. 
     According to some embodiments, the faceplate comprises a cavity at its lower face for at least partly receiving the module, the faceplate cavity being configured for facing the inner space of the shell. 
     According to some embodiments, the charging arrangement comprises a coil. According to some embodiments, the charging arrangement comprises terminals extending at the upper face of the faceplate. 
     According to some embodiments, the button arrangement comprises a plunger, which is operable through the upper face of the faceplate. 
     According to some embodiments, the coil comprises one or more windings, the one or more windings are provided circumferential of an inner cavity of the coil with respect to a center axis of the coil. 
     According to some embodiments, the plunger is configured to extend through said inner cavity of the coil along the coil center axis. 
     According to some embodiments, one or more of the windings of the coil is/are configured to extend radially and/or axially around the inner cavity of the coil. 
     According to some embodiments, the plunger is configured as a control knob adapted to activate the integrated circuit when turned and/or pushed. 
     According to some embodiments, the button arrangement is configured to control and/or activate and/or deactivate the hearing aid. 
     According to some embodiments, the coil is an antenna for wireless communication. According to some embodiments, the coil is configured for charging the battery wirelessly. According to some embodiments, the coil is configured for wireless communications and/or wireless charging the battery. According to some embodiments, the coil is an antenna for wireless communication and configured for charging the battery wirelessly. 
     According to some embodiments, the hearing aid comprises at least two microphone arrangements. 
     According to some embodiments, the coil comprises a body having a cross-section being oval in a plane perpendicular to the center/longitudinal coil axis. According to some embodiments, the coil body has a cross-section being oval and/or circular and/or elliptical in a plane perpendicular to the center/longitudinal coil axis. 
     According to some embodiments, the coil has a radial/extension perpendicular to its centre axis being larger/greater than its longitudinal/extension along or in parallel with its centre axis. According to some embodiments, the coil has a larger/greater width/breadth as measured in a plane perpendicular to its centre axis than its length as measured in a plane along or in parallel with its centre axis. 
     According to some embodiments, the shell is adapted after a user&#39;s auditory canal such that the hearing aid when placed in the ear is always orientated in a specifically predetermined position such that the time delay between sound received by the microphone arrangements gives an indication of direction from where the sound originate. 
     According to some embodiments, the coil and its body allow the microphone arrangements to be situated outside the oval, circular and/or cylindrical body. According to some embodiments, the coil and its body allow the microphone arrangements to be situated offcenter and/or outside the oval and/or circular and/or cylindrical and/or elliptical shape of the body. In some embodiments, the coil is a planar coil. According to some embodiments, the coil is configured for extending in an axial direction along a center axis of the coil. 
     According to some embodiments, the microphone arrangements of the hearing aid are essentially situated horizontally during use. 
     According to some embodiments, the plunger in at least one position extends through and beyond/past the length of the coil and/or the inner cavity of the coil for engaging the integrated circuit. According to some embodiments, the plunger is at least partly made of a material being magnetizable. 
     According to an embodiment, the microphone arrangements of the hearing aid are situated horizontally during use. However this of course being in dependency of the user&#39;s orientation of the head/ears. 
     The horizontal orientation of the hearing aid is defined relative an ear-to-ear axis being essentially parallel to or parallel to the users face, i.e. when the hearing aid is positioned at its operational position at the ear/-s of a user. 
     According to a second aspect there is provided a charging station comprising a body and a lid, wherein the charging station is configured to charge a hearing aid according to any of the disclosed aspects/embodiments by means of induction when the hearing aid is coupled to the charging station. 
     According to some embodiments, the charging station comprises a coil configured for magnetizing said plunger and thereby charging the hearing aid when the charging station is coupled to the hearing aid. 
     According to an third aspect there is provided a method of producing a charging station according to any disclosed aspect/embodiment, the method comprising the steps of manufacturing a body of the charging station, providing the body with a cavity being essentially shaped as the hearing aid&#39;s shell, manufacturing a lid of the charging station, providing the lid with a cavity for receiving the hearing aid&#39;s faceplate, providing the lid with a charging device, the charging device and the lid being adapted to mate such that the charging device is able to charge the hearing aid when the lid is closed. 
     According to some embodiments, the method comprises the steps of manufacturing a body of the charging station, providing the body with a cavity being essentially shaped as the hearing aid&#39;s shell, manufacturing a lid of the charging station, providing the lid with a cavity being essentially shaped for receiving the hearing aid&#39;s faceplate, providing the lid with a charging device, the charging device and the lid being adapted to mate such that the charging device is able to charge the hearing aid when the lid is closed 
     According to a fourth aspect there is provided a charging station comprising a body and a lid, wherein the charging station is configured to charge one or more hearing aids according to any of the disclosed aspects/embodiments by means of induction when the hearing aid/-s is/are coupled to the charging station, and which body of the charging station is configured to at least roughly guide or steer or orientate or align the hearing aid/-s when introduced and received therein into position and which lid of the charging station is configured to guide or steer or orientate or align the hearing aid/-s as/when introduced/received in the charging station with a finer or vernier or final control into a final charging position of the hearing aid/-s when the lid is closed. 
     According to some embodiments, the shell of the hearing aid has its cavity/space opening or orifice of its inner cavity or space facing the distal end of the hearing aid, which opening the faceplate of the hearing aid is configured to close when applied thereon. 
     According to some embodiments, the plunger is configured as a core for its coil. 
     Further objects and features will appear from the following definitions of aspects/examples/embodiments thereof. It is also to be understood that the terminology used herein is for purpose of describing particular embodiments only, and is not intended to be limiting. It should be noted that, as used in the specification and appended claims, the articles “a”, “an”, “the”, and “said” are intended to mean that there are one or more of the elements unless the context explicitly dictates otherwise. Thus, for example, reference to “a unit” or “the unit” may include several devices, and the like. Furthermore, the words “comprising”, “including”, “containing” and similar wordings does not exclude other elements or steps. 
     Terminology—The term “outside” is to be interpreted as meaning that an entity is at least partly or fully (wholly) placed or arranged outside or externally of another entity. 
    
    
     
       BRIEF DESCRIPTIONS OF THE DRAWINGS 
       The above objects, as well as additional objects, features and advantages of the present disclosure, will be more fully appreciated by reference to the following illustrative and non-limiting detailed description of example embodiments of the present disclosure, when taken in conjunction with the accompanying drawings. 
         FIG.  1 A  shows a side view in cross-section of the hearing aid according to an embodiment of the present disclosure. 
         FIG.  1 B  shows a perspective view in cross-section of a face plate of the hearing aid according to an embodiment of the present disclosure. 
         FIG.  1 C  shows the faceplate of the hearing aid of  FIG.  1 B  from the underside according to an embodiment of the present disclosure. 
         FIG.  1 D  schematically illustrates an example of a hearing aid according to an embodiment of the present disclosure. 
         FIG.  2 A  shows a hearing aid shell in perspective according to an example of prior art. 
         FIG.  2 B  shows a shell of the hearing aid in perspective according to an embodiment of the present disclosure. 
         FIG.  3    shows the hearing aid in a top view (towards the faceplate of the hearing aid) according to an embodiment of the present disclosure. 
         FIG.  4 A  shows a cross-sectional view in perspective of the hearing aid according to an embodiment of the present disclosure. 
         FIG.  4 B  shows a side view of a cross-section of the hearing aid according to an embodiment of the present disclosure. 
         FIG.  4 C  shows a cross-sectional view in perspective of the hearing aid according to an embodiment of the present disclosure. 
         FIG.  4 D  shows a side view of a cross-section of the hearing aid according to an embodiment of the present disclosure. 
         FIG.  4 E  shows a cross-sectional view in perspective of the hearing aid according to an embodiment of the present disclosure. 
         FIG.  4 F  shows a side view of a cross-section of the hearing aid according to an embodiment of the present disclosure. 
         FIG.  5 A  shows a cross-sectional view in perspective of the hearing aid according to an embodiment of the present disclosure. 
         FIG.  5 B  shows a side view of a cross-section of the hearing aid according to an embodiment of the present disclosure. 
         FIG.  5 C  shows a cross-sectional view in perspective of the hearing aid according to an embodiment of the present disclosure. 
         FIG.  5 D  shows a side view of a cross-section of the hearing aid according to an embodiment of the present disclosure. 
         FIG.  6 A  shows a cross-sectional planar view from above of a coil of the hearing aid according to an embodiment of the present disclosure. 
         FIG.  6 B  shows a cross-sectional planar view from above of a coil of the hearing aid according to another embodiment of the present disclosure. 
         FIG.  7    shows a side view of a cross-section of a charging station according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The disclosure may, however, be embodied in other forms and should not be construed as limited to the herein disclosed embodiments/examples. The disclosed embodiments are provided to fully convey the scope of the disclosure to the skilled person. Like reference numerals refer to like elements throughout. Like elements will, thus, not be described in detail with respect to the description of each figure. It should also be noted that the figures are only intended to facilitate the description of the embodiments. They are not intended as an exhaustive description of the claimed invention or as a limitation on the scope of the claimed invention. In addition, an illustrated embodiment needs not have all the aspects or advantages shown. An aspect or an advantage described in conjunction with a particular embodiment is not necessarily limited to that embodiment and can be practiced in any other embodiment/-s even if not so illustrated, or if not so explicitly described. Throughout, the same reference numerals are used for identical or corresponding parts. 
     The present description provides an improved hearing aid  10  for placement in a user&#39;s ear canal, a charging station  200  and a method of producing a charging station. According to an example embodiment there is provided a hearing aid  10  for placement in a user&#39;s ear canal. The hearing aid  10  has a proximal end  1  and a distal end  2 . The proximal end  1  is the end of the hearing aid  10  that is inserted into the user&#39;s ear canal and facing the tympanic membrane when inserted, the distal end  2  is the opposite end. The hearing aid  10  comprises a shell  20  customized for the user&#39;s ear canal. The shell  20  comprises an inner space  21  configured for at least partly receiving a rechargeable battery  40 . In some embodiments, not all, the shell  20  comprises an inner space  21  configured for at least partly receiving a charging arrangement  50 . The shell  20  comprises an inner space  21  configured for at least partly receiving at least one microphone arrangement  110 . In some embodiments, not all, the inner space  21  is configured for facing and/or at least partly receiving at least one microphone arrangement  110  and/or facing and/or at least partly receiving one audio channel  120 . The shell  20  comprises an inner space  21  configured for at least partly or wholly/fully receiving an integrated circuit (IC)  80 . In some embodiments, the inner space  21  is configured for facing and/or at least partly receiving at least one microphone arrangement  110  and/or at least partly receiving one audio channel  120 . One or more audio channels  120  is provided to guide sound to the microphone/-s of the microphone arrangement/-s  110 . The shell  20  comprises an opening or orifice  22  at and facing towards the distal hearing aid end  2 . The hearing aid  10  comprises a faceplate  30  comprising an upper face  31  and a lower face  32  and a circumference. The upper face  31  is exposed at the distal end  2  of the hearing aid  10  when the shell  20  is placed in the user&#39;s ear canal. The faceplate  30  is configured for closing the inner shell space  21 . The IC  80  is configured to be arranged between the faceplate  30  and the proximal hearing aid end  1 . The charging arrangement  50  is configured to be situated at the distal hearing aid end  2 . The battery  40  is configured to be situated between the IC  80  and the proximal end  1 . The shell opening/orifice  22  is configured to be closed off by the faceplate  30  when assembled against the shell  20  at the distal hearing aid end  2  to make up the whole hearing aid  10 . The shell opening/orifice  22  is configured to be closed off by the faceplate  30  and these entities are sealingly assembled when/after making up the hearing aid  10 . 
     According to an example, the charging arrangement  50  and the at least one microphone arrangement  110  are produced as one module M, see  FIGS.  1 A,  1 C,  2 B,  4 A,  4 B,  4 C,  4 D,  4 F,  5 A,  5 B,  5 C and  5 D . According to an example, the faceplate  30  comprises a cavity  33  at its lower face  32  for at least partly or fully/wholly receiving said module  50 ,  110 , M. If the faceplate cavity  33  wholly/fully receives the module M, module M could be flush with the lower face  32  of the face plate  30 . The faceplate cavity  33  is configured for facing and/or closing the inner space  21  of the shell  20  similar to a lid then being sealed. According to an example, the charging arrangement  50  comprises a coil  54 . The coil  54  is configured for wireless communication and/or wireless charging of the battery  40 . According to an example, the charging arrangement  50  comprises terminals  55  extending at the upper face  31  of the faceplate  30 . According to an example, the hearing aid  10  comprises a button arrangement  60  that in turn comprises a plunger  70  being operable through the upper face  31  of the faceplate  30 . In an embodiment, the plunger  70  is adapted to activate one or more push buttons  61  on the IC  80  when the plunger/-s is/are pushed towards the IC. According to an embodiment, the button arrangement  60  comprises the plunger/-s  70  and/or the push button/-s  61 . In an embodiment, the plunger/-s  70  and push button/-s  61  are part of the same entity or integral parts that could be fixed or movable at least somewhat relative each other. In an embodiment, the plunger/-s  70  and/or push button/-s  61  are part of the faceplate  30  or integrated in the faceplate. In an embodiment, the plunger/-s  70  and/or push button/-s  61  are part of the faceplate  30  or integrated in the faceplate and movable at least somewhat relative each other and/or the face plate  30  to ensure their engagement and disengagement with the IC  80  for its control and/or activation/deactivation. 
     According to an example, the coil  54  comprises one or more windings  53 . The one or more windings  53  are provided circumferential of an inner cavity  52  of the coil  54  with respect to a center or longitudinal axis CC of the coil. According to an example, the plunger  70  is configured to extend through the inner coil cavity  52  along the coil center/longitudinal axis CC. The plunger  70  is in one example a single push button. In one example, the plunger  70  is a rocker arm with two circuits or the like. According to an example, one or more of the windings  53  of the coil  54  is/are configured to extend radially and/or axially around the inner coil cavity  52 . As examples, the plunger/-s  70  is a push button preferably being spring biased to be forced back to its initial position after the pushing force ends. An alternative for the plunger/-s  70  is a rocker arm. A rocker arm  70  is a flexible and/or jointed/hinged arm, which will spring back to its initial position once the pushing force is gone. The plunger/-s  70  and/or rocker arm may either activate a push button  61  on the IC  80  or have a metallic tip which closes a circuit when coming into contact with an opposite part of a switch or the like on the IC. 
     According to an example, the plunger  70  is configured as a control knob adapted to activate the IC  80  when turned. According to an example, the button arrangement  60 ,  61 ,  70  is configured to activate or deactivate the hearing aid  10  and/or control it to change program and/or change audio filtering and/or volume (down/up) and/or power (down/up) and/or turn it on or off via the IC  80  or the like component/-s, such as further control units  81 ,  92 . 
     According to an example, the coil  54  is an antenna  130  for wireless communication. According to an example, the coil  54  is configured for charging the battery  40  wirelessly. According to an example, the coil  54  is an antenna  130  for wireless communication and configured for charging the battery  40  wirelessly. 
     According to an example, the hearing aid  10  comprises at least two microphone arrangements  110 . According to examples, one, both or each microphone arrangement  110  comprises at least one audio channel  120 , see  FIGS.  3 ,  4 A,  4 C and  4 E . 
     According to an example, the coil  54  comprises a body  51  having a cross-section being oval in a plane perpendicular to its center/longitudinal axis CC and/or the center/longitudinal axis CP of the plunger  70 , see e.g.  FIGS.  1 B,  1 C,  6 A and  6 B . 
     According to an example, said coil body  51  has a cross-section being circular and/or elliptical in a plane perpendicular to the center/longitudinal axis CC, see e.g.  FIGS.  1 B and  2 B . 
     The orientation and/or extension of the cross-sectional plane of the coil  54  could be diverging from/in relation to the center/longitudinal coil axis CC and/or the center/longitudinal axis CP of the plunger  70  at any other angle besides about 90° or exactly 90°, e.g. at an angle of between about 10° to 80° or between 10° to 80°; or at an angle of between about 20° to 70° or between 20° to 70°; or at an angle of between about 30° to 60° or between 30° to 60°; or at an angle of between about 40° to 50° or between 40° to 50°; or at an angle of about 45° or exactly 45°. 
     According to an example, the coil  54  has a radial/(physical) extension perpendicular to its centre axis CC being larger/greater than its longitudinal/(physical) extension along or in parallel with its centre axis CC. 
     According to an example, the coil  54  has a larger/greater width/breadth/thickness W/T as measured in a plane perpendicular to its centre axis CC than its length/height L/H as measured in a plane along or in parallel with its centre axis CC, see e.g.  FIGS.  1 A,  4 B,  4 D,  4 F,  5 B,  5 D,  6 A and  6 B . 
     According to an embodiment, the shell  20  is adapted after a user&#39;s auditory canal such that each hearing aid  10  when placed in the ear is always orientated in a specifically predetermined position so that the time delay between sound received by the microphone arrangement/-s  110  and audio channel/-s  120  give/-s an indication of direction from where the sound originate. 
     According to an embodiment, the coil  54  and its body  51  allow the microphone arrangement/-s  110  to be situated off-center and/or outside the body. According to an embodiment, the coil  54  and its body  51  allow the microphone arrangement/-s  110  to be situated off-center and/or outside the cylindrical body. According to an embodiment, the coil  54  and its body  51  allow the microphone arrangement/-s  110  to be situated off-center and/or outside the oval shape. According to an embodiment, the coil  54  with body  51  allow the microphone arrangement/-s  110  to be situated off-center and/or outside the circular and/or elliptical shape of the body. 
     According to an embodiment there is provided a hearing aid  10 , wherein the microphone arrangement/-s  110  are essentially situated horizontally during use. The horizontal orientation of the hearing aid  10  is defined relative an ear-to-ear axis being essentially parallel to or parallel to the users face, i.e. when the hearing aid  10  is positioned at its operational position at the ear/-s of a user. 
     According to an embodiment, the plunger  70  in at least one position extends through and beyond/past the length/height/thickness L/H of the coil  54  for engaging the IC  80 . 
     According to an embodiment, the plunger  70  is at least partly or wholly made of a material being magnetizable. According to an example, the plunger  70  is at least partly or wholly made of a magnetic material. This improves the performance of the coil  54  and associated entities when the coil is used as a magnetic induction antenna. 
     According to an embodiment, the coil  54  has a radial/extension W/T perpendicular to its center axis CC being larger/greater than its longitudinal/extension L/H along or in parallel with its centre axis. 
     According to an embodiment there is provided a charging station  200  comprising a body  210  and a lid  300 , wherein the charging station is configured to charge one or more hearing aids  10  simultaneously and/or in parallel and/or in series and/or one by one and/or only one or two at a time according to any of disclosed aspects/examples by means of induction when the hearing aid/-s is/are coupled to the charging station. 
     According to an embodiment, the charging arrangement  50  comprises a coil  54  configured for magnetizing the plunger  70  and thereby charging the hearing aid  10  when the charging station  200  is coupled to the hearing aid. 
     According to an aspect there is provided a method of producing a charging station  200  comprising the steps of manufacturing a body  210  of the charging station; providing the body  210  with a cavity  220  being essentially shaped as the hearing aid&#39;s shell  20 ; manufacturing a lid  300  of the charging station  200 ; providing the lid with a cavity  310  for abutting and/or contacting/touching and/or engaging and/or enclosing and/or covering and/or receiving the hearing aid&#39;s faceplate  30 ; providing the lid with a charging device  320 , the charging device  320  and the lid  300  being adapted to mate such that the charging device  320  is able to charge the hearing aid  10  when the lid  300  is closed. 
     According to an embodiment, said method comprises the steps of manufacturing a body  210  of the charging station  200 ; providing said body with a cavity  220  being essentially shaped as the hearing aid&#39;s shell  20 ; manufacturing a lid  300  of the charging station; providing said lid  300  with a cavity  310  being essentially shaped for receiving the hearing aid&#39;s face plate  30 ; providing said lid with a charging device  320 , said charging device  320  and said lid  300  being adapted to mate such that said charging device  320  is able to charge the hearing aid  10  when the lid  300  is closed. The charging device/-s  320  of the charging station/-s  200  and the charging arrangement/-s  50 ,  54  of the hearing aid/-s  10  are configured to be operatively controlled to cooperate together to enable the charging functionality without direct physical contact between electrical conductors, i.e. by contactless charging, e.g. via induction. 
       FIG.  1 A  shows an embodiment of the disclosure.  FIGS.  1 B and  1 C  show the embodiment of  FIG.  1 A  in two different perspectives, i.e.  FIG.  1 B  shows the faceplate  30  partly in cross-section essentially in the direction of arrows A and in perspective somewhat angled in relation to the plane of the faceplate  30  and the longitudinal axis CP of the plunger/button  70 , while  FIG.  1 C  shows the faceplate  30  in  FIG.  1 B  from below in the direction of arrows C of  FIGS.  1 B and  1     n  perspective, i.e. essentially in parallel with or at least almost in alignment with/along the longitudinal axis CP of plunger or button  70 .  FIG.  2 A  shows a prior art hearing aid shell  20 .  FIG.  2 B  shows an embodiment of the disclosure.  FIG.  3    shows the embodiment of  FIGS.  1 A-C  in direction of arrows B, i.e. perpendicular to the plane of the faceplate  30  but along the longitudinal axis CP of the plunger/button  70 .  FIGS.  4 A and  4 B  show an embodiment of the disclosure from two different perspectives and as part cutouts, i.e.  FIG.  4 A  shows the same embodiment as in  FIG.  4 B  but in perspective, i.e.  FIG.  4 B  shows the same embodiment as in  FIG.  4 A  but in planar view.  FIGS.  4 C and  4 D  show an embodiment of the disclosure from two different perspectives and as part cutouts, i.e.  FIG.  4 C  shows the same embodiment as in  FIG.  4 D  but in perspective, i.e.  FIG.  4 D  shows the same embodiment as in  FIG.  4 C  but in planar view.  FIGS.  4 E and  4 F  show an embodiment of the disclosure from two different perspectives and as part cutouts, i.e.  FIG.  4 E  shows the same embodiment as in  FIG.  4 F  but in perspective, i.e.  FIG.  4 F  shows the same embodiment as in  FIG.  4 E  but in plane view.  FIGS.  5 A and  5 B  show an embodiment of the disclosure from two different perspectives and as part cutouts, i.e.  FIG.  5 A  shows the same embodiment as  FIG.  5 B  but in perspective, i.e.  FIG.  5 B  shows the same embodiment as in  FIG.  5 A  but in plane view.  FIGS.  5 C and  5 D  show an embodiment of the disclosure from two different perspectives and as part cutouts, i.e.  FIG.  5 C  shows the same embodiment as in  FIG.  5 D  but in perspective, i.e.  FIG.  5 D  shows the same embodiment as in  FIG.  5 C  but in a planar view.  FIGS.  6 A and  6 B  show differently shaped embodiments of the coil  54  in planar cross-sectional views.  FIG.  7    shows an embodiment of a charging station  200  in cross-section. 
     The first aspect of this disclosure shows a hearing aid  10  for placement in a user&#39;s ear canal, the hearing aid having a proximal end  1  and a distal end  2 . The proximal end  1  is the end of the hearing aid  10  that is inserted into the user&#39;s ear canal and facing the tympanic membrane when inserted. The distal end  2  is the opposite end. The hearing aid  10  comprises a shell  20  customized for the user&#39;s ear canal. The shell  20  comprises an inner space  21  configured for at least partly receiving a rechargeable battery  40 . The hearing aid  10  comprises a charging arrangement  50 ,  54 , at least one microphone arrangement  110 ,  120 , an integrated circuit (IC)  80 , and a faceplate  30  comprising an upper face  31  and a lower face  32  and a circumference. The upper face  31  is exposed at the distal end  2  of the hearing aid  10  when the shell  20  is placed in the user&#39;s ear canal. The faceplate  30  is configured for closing the inner space  21  of the shell  20 . The IC  80  is arranged between the faceplate  30  and the proximal end  1 . The charging arrangement  50  is situated at the distal end  2  of the hearing aid  10 . The battery  40  is situated between the IC  80  and the proximal end  1 . 
     The charging arrangement  50 ,  54  and at least one microphone arrangement  110  are produced as one module M in an embodiment. The charging arrangement  50 ,  54  and two microphone arrangements  110  are produced as one module M in an embodiment. The charging arrangement  50 ,  54 , two microphone arrangements  110  and optionally at least one button arrangement  60 ,  61 ,  70  are produced as one module M in an embodiment. In an embodiment, the charging arrangement  50  and its coil  54 , at least one microphone arrangement  110  and at least one button arrangement  60 ,  61 ,  70  are produced as one module M. In an embodiment, the charging arrangement  50  and its coil  54 , at least one microphone arrangement  110 , at least one button arrangement  60 ,  61 ,  70  and at least one 2.4 GHz antenna are produced as one module M. In an embodiment, such a solution above and/or below creates a new standardized architecture module enabling fixating at least the entities  50 ,  54  and  110 , i.e. the charging arrangement and the microphone arrangement/-s, in the face plate  30  as one module M. In an embodiment, any of the above and/or below solutions simplifies/-y access of the following entities: the charging arrangement  50 ,  54  and the microphone arrangement/-s  110  and, optionally, the button arrangement  60 ,  61 ,  70  from the faceplate  30  enabling program switching and/or charging and/or sound intake and/or sound output and/or control of wireless performance of the hearing aid  10 . In an embodiment, a module M comprising at least the charging arrangement  50 ,  54  and the microphone arrangement/-s  110  eliminate the need of a battery opening in the faceplate  30 . In an embodiment, a module M comprising the charging arrangement  50  with its coil  54  and the microphone arrangement/-s  110  and optionally comprising at least one button arrangement  60 ,  61 ,  70  optimize/minimize the design/size of the faceplate  30 . In an embodiment, a module M that comprises the charging arrangement  50 ,  54  and/or a button arrangement  60  and/or a button  61  and/or a plunger  70  and the microphone arrangement/-s  110  provide a more flexible architecture of the hearing aid  10  and the components making it up where placement of components of the hearing aid  10  are defined by their required position, so they perform as intended. In an embodiment, a module M comprising the charging arrangement  50 ,  54  and/or button arrangement  60 ,  61  and/or the plunger/-s  70  and the microphone arrangement/-s  110  provide placing components within the hearing aid  10  that do not require a specific position more freely where space is available in the shell  20  and finally the custom hearing aid  10  is possible to make more environmental robust as it then is easily closed and/or sealed. A module M optimizes use/filling of already existing empty space through the coil  54 , thereby improving the filling grade of the hearing aid  10 . The shell  20  and faceplate  30  of the hearing aid  10  is in an embodiment fixed and/or closed and/or sealed when/after mating/attachment. In an embodiment, the charging coil  54  is fixed on/in/at the faceplate  30 . In an embodiment, a 2.4 GHz antenna is placed inside the hearing aid  10 . In an embodiment, a 2.4 GHz antenna is fixed on/in/at/adjacent the faceplate  30 . In an embodiment, a 2.4 GHz antenna is fixed in a standard shape as a part of the module M comprising the charging arrangement  50 ,  54  and/or the button arrangement  60 ,  61  and/or the plunger  70  and the microphone arrangement/-s  110 . In an embodiment, a 2.4 GHz antenna is part of the module M comprising the charging arrangement  50 ,  54  and/or the button arrangement  60 ,  61  and/or the plunger  70  and the microphone arrangement/-s  110  at or adjacent or close to and/or in contact with and/or enclosed by the face plate  30 . In an embodiment, a 2.4 GHz antenna is fixed in a standard shape as part of the module M comprising the charging arrangement  50 ,  54  and/or the button arrangement  60 ,  61  and/or the plunger  70  and the microphone arrangement/-s  110  in the shell  20  at/adjacent/in or close to the faceplate  30 . More than one antenna  54 ,  130  could be placed inside the hearing aid  10  as explained above, and one or more of these antennas may be configured to operate in a first frequency range, such as at a frequency above 800 MHz, and/or at a frequency above 1 GHz, e.g. at the frequency of 2.4 GHz above, and/or at a frequency between 1.5 GHz and 3 GHz, during use. 
     The faceplate  30  comprises a cavity  33  at its lower face  32  for at least partly and/or wholly/fully receiving and/or enclosing and/or touching/engaging the module M comprising at least one charging arrangement  50  and at least one microphone arrangement/-s  110  and/or at least one button arrangement  60 ,  61  and/or at least one plunger  70 . The faceplate cavity  33  is configured for facing the inner shell space  21 . The charging arrangement  50  comprises at least one coil  54 . Charging arrangement  50  comprises optionally one or more terminals  55  extending at and/or being exposed/accessible on the upper face  31  of faceplate  30 , see  FIG.  7   . 
     The button arrangement  60  comprises at least one plunger  70  being operable through/via the upper face  31  of the faceplate  30 , see  FIGS.  1 A-C ,  2 B,  4 C,  4 D,  5 A,  5 B,  6 A and  6 B. The coil  54  comprises one or more windings  53 , the one or more windings are provided circumferential of an inner cavity  52  of the coil with respect to a center axis CC of the coil, see  FIGS.  2 B,  4 C,  4 D,  5 A,  5 B,  6 A and  6 B . Button arrangement  60  is configured such that the plunger  70  in at least one position extends through the inner coil cavity  52  for engaging the IC  80 . 
     The plunger  70  is configured to extend through the inner cavity  52  of the coil  54  along the coil center axis CC. One or more of the windings  53  of the coil  54  is/are configured to extend radially and/or axially around the inner coil cavity  52 . The plunger  70  is configured as a control knob adapted to activate the integrated circuit  80  when turned. The button arrangement  60 ,  61 ,  70  is configured to activate or deactivate the hearing aid  10 . 
     The coil  54  is an antenna  130  for wireless communication. The coil  54  is configured for charging the battery  40  wirelessly. The coil  54  is an antenna  130  for wireless communications and/or configured for charging the battery  40  wirelessly, such as contactless. 
     For the contactless charging wireless power transfer is applicable by a number of different technologies for use such as inductive coupling, resonant inductive coupling, capacitive coupling, magneto dynamic coupling, microwaves, light waves, etc. The rechargeable battery/-ies  40  may be lithium-ion batteries, a silver-zinc battery, etc. 
     The hearing aid  10  comprises at least two microphone arrangements  110 . 
     The coil  54  comprises a body  51  having a cross-section being oval in a plane perpendicular to the center/longitudinal axis CC. The coil  54  comprises a body  51  having a cross-section being oval in a plane being perpendicular to a center/longitudinal axis CP of the plunger  70 , see  FIGS.  1 B,  1 C,  6 A and  6 B . 
     The coil body  51  has a cross-section being oval, circular and/or elliptical in a plane perpendicular to the center/longitudinal coil axis CC. The coil body  51  has a cross-section being oval, circular and/or elliptical in a plane being perpendicular to the center/longitudinal axis CP of the plunger  70 , see  FIGS.  1 B,  1 C,  6 A and  6 B . 
     The coil  54  has a radial/(physical) extension perpendicular to its centre axis CC being larger/greater than its longitudinal/(physical) extension along or in parallel with its centre axis, see  FIGS.  6 A,  6 B . The coil  54  has in an embodiment a larger/greater width/breadth W/T as measured in a plane approximately perpendicular or perpendicular to its centre axis CC than its length as measured in a plane along or in parallel with its centre axis, see  FIGS.  6 A and  6 B . 
     The shell  20  is adapted after a user&#39;s auditory canal such that the hearing aid  10  when placed in the ear is always orientated in a specifically predetermined position such that the time delay between sound received by the microphone arrangements  110  gives an indication of direction from where the sound originate, see  FIG.  3   . 
     The coil  54  and its body  51  allow one or more or each of the microphone arrangement/-s  110  to be situated off-center and/or displaced relative and/or outside the coil body  51  in an embodiment. The coil  54  and its body  51  allow the microphone arrangement/-s  110  to be situated off-center and/or displaced relative and/or outside the oval and/or circular and/or elliptical shape of the coil body  51  in an embodiment. The coil  54  is configured for extending in an axial direction along a center/longitudinal axis CC of the coil. 
     One aspect of this disclosure concerns a hearing aid  10 , wherein the microphone arrangements  110  are configured to be essentially situated horizontally during use. This is shown in  FIG.  3    where two or more microphone arrangements  110  and associated audio channels  120  for receiving sound is aligned in a direction perpendicular to the long sides of  FIG.  3    but in parallel with the short sides of the figure with the same orientation as the numerals corresponding to a horizontal direction. 
     The plunger  70  in at least one position extends through and beyond/past the length/height L/H of the coil  54  for engaging the IC  80 , see at least  FIGS.  1 A,  4 B,  4 D,  4 F,  5 B and  5 D . The plunger  70  is at least partly made of a material being magnetizable. 
     One aspect of this disclosure concerns a charging station  200  comprising a body  210  and a lid  300 . The charging station  200  is configured to charge a hearing aid  10  according to any of the disclosed aspects/examples/embodiments by means of induction when the hearing aid is coupled to the charging station. The charging station  200  comprises a coil (transmitting coil) configured for magnetizing the plunger  70  and thereby charging the hearing aid/-s  10  (via its receiving coil  54 ) when the charging station is coupled to the hearing aid/-s. 
     The hearing aid  10  comprises one or more control units  81  for controlling the functionality of the hearing aid  10  by being operatively connected to the other components of the hearing aid, among others the plunger  70 , the IC  80  and the button arrangement  60 ,  61 . The hearing aid  10  comprises one or more receivers, suspensions and/or wax/sound filter/-s  90  and/or loud speakers  91  and/or conduits or channels  140  for operative connection and/or audio communication between the receiver/-s  90  and/or the loud speakers  91  and/or the control unit  81  and/or any other associated component. The control unit  81  for controlling the hearing aid  10  is operatively connected to other components including the microphones  110  and battery  40 , such as electronics/electronic circuits and mechanical devices incl. electrical conduits etc., however, these entities working together for the operation of the hearing aid are possible to implement by use of many different types of components and parts being common knowledge for a skilled person and are therefore not explained in detail herein. 
     Each microphone arrangement  110  works as an input transducer and the functionality of the hearing aid  10  is explained shortly here as its function is common knowledge for a skilled person. Each microphone of the microphone arrangement  110  receives sound through an audio channel  120  and a filter  90  and outputs an analogue audio signal based on the acoustic sound signal arriving at the microphone  110  when the hearing aid  10  is operating. An analogue-to-digital converter converts the analogue audio signal into a corresponding digital audio signal for digital signal processing in the hearing circuit, such as a hearing loss processor that is configured to compensate a hearing loss of a user of the hearing aid  10 . Preferably, the hearing loss processor comprises a dynamic range compressor well-known in the art for compensation of frequency dependent loss of dynamic range of the user often termed recruitment in the art. In this way, the hearing aid  10  may be configured to restore loudness, such that loudness of the hearing loss compensated signal as perceived by the user wearing the hearing aid  10  substantially matches the loudness of the acoustic sound signal arriving at the microphone  110  as it would have been perceived by a listener with normal hearing. Accordingly, the hearing loss processor outputs a digital hearing loss compensated audio signal. A digital-to-analogue converter then converts the digital hearing loss compensated audio signal into a corresponding analogue hearing loss compensated audio signal. An output transducer in the form of a receiver  91  converts the analogue hearing loss compensated audio signal into a corresponding acoustic signal for transmission via a loudspeaker  91  or the like (see below) towards an eardrum of the user, whereby the user hears the sound originally arriving at the microphone  110 , however, compensated for the user&#39;s individual hearing loss. The hearing loss processor is operatively coupled to the control unit  81  and/or master control unit of the hearing aid  10  in a way being common knowledge to a skilled person. 
     The hearing aid  10  optionally includes a wireless communication unit  93 , e.g. in the form of a radio chip connected to an antenna  130  and/or the coil  54  or the like working as an antenna, and configured to communicate wirelessly with other devices, e.g. in a hearing loss aiding network as is well-known in the art. 
       FIG.  1 D  schematically illustrates an embodiment of a hearing aid  10  comprising one or more microphones  110  for receiving an input signal and converting it into an audio signal. The audio signal is provided to a processing unit  81 ,  92  for processing the audio signal and providing a processed output signal for compensating a hearing loss of a user of the hearing aid  10 . A receiver  91  is connected to an output of the processing unit  92  and/or the control unit  81  for converting the processed output signal into an output sound signal, e.g. a signal modified to compensate for a user&#39;s hearing impairment. Typically, a receiver  91  comprises a transducer, and a receiver  91  is often referred to as a loudspeaker  91 . The processing unit  81 ,  92  may comprise elements such as amplifiers, compressors, noise reduction systems, etc. The hearing aid  10  may further comprise one or more wireless communication units  93  for wireless data communication interconnected with an antenna structure  94 ,  130  and/or the control unit  81  for emission and reception of an electromagnetic field. The wireless communication unit  93 , such as a radio or a transceiver, connects to the processing unit  92  and/or the control unit  81  and the antenna structure  94 ,  130 , for communicating with an electronic device, an external device, or with another hearing aid  10 , such as another hearing aid  10  located in/on/at another ear of the user, typically in a binaural hearing system. The hearing aid  10  may comprise two or more antenna structures  94 ,  130 , e.g. in cooperation/use with the coil  54  working as an antenna. 
     The hearing aid  10  may comprise one or more antennas  54 ,  94 ,  130  for radio frequency communication. The one or more antennas  54 ,  94 ,  130  may be configured to operate in a first frequency range, such as at a frequency above 800 MHz, such as at a frequency above 1 GHz, such as at a frequency of 2.4 GHz, such as at a frequency between 1.5 GHz and 3 GHz, during use. Thus, the first antenna  54 ,  94 ,  130  may be configured for operation in ISM frequency band. The first antenna may be any antenna capable of operating at these frequencies, and the first antenna may be a resonant antenna, such as monopole antenna, such as a dipole antenna, etc. The resonant antenna may have a length of lambda/4 or any multiple thereof, lambda being the wavelength corresponding to the emitted electromagnetic field. 
     The hearing aid  10  may comprise one or more wireless communications units  93  or radios. The one or more wireless communications units  93  are configured for wireless data communication, and in this respect interconnected with the one or more antennas  54 ,  94  for emission and reception of an electromagnetic field. Each of the one or more wireless communication units  93  may comprise a transmitter, a receiver, a transmitter-receiver pair, such as a transceiver, a radio unit, etc. The one or more wireless communication units  93  may be configured for communication using any protocol as known for a person skilled in the art, including Bluetooth, WLAN standards, manufacture specific protocols, such as tailored proximity antenna protocols, such as proprietary protocols, such as low-power wireless communication protocols, RF communication protocols, magnetic induction protocols, etc. The one or more wireless communication units  93  may be configured for communication using same communication protocols, or same type of communication protocols, or the one or more wireless communication units  93  may be configured for communication using different communication protocols. 
     The hearing aid  10  comprises optionally one or more charging control units that could be control unit  81  or another control unit to enable charging one or more hearing aids. 
     The charging station  200  comprises one or more charging control units  330  comprising one or more leads or conduits  331  for enabling leading power to one or more or both or each hearing aid  10  for charging one or more of the hearing aids. The charging control units  330  of the charging station  200  cooperate operatively in some embodiments with the control unit/-s  81  of the hearing aid/-s  10  when applicable. The control, communication and charging control units  81 ,  92 ,  93 ,  330  for controlling the hearing aid  10  and its charging and/via the charging station  200  are operatively connected to each other and other components including one or more batteries  40 , such as electronics/electronic circuits and mechanical devices incl. electrical conduits etc. when applicable, to safely operate the hearing aid/-s  10  and/or charge the battery/-ies in each hearing aid. 
     The hearing aid  10  comprises one or more audio channels  120 . In some embodiments, the plunger  70  is configured as a core for the coil  54 . In some embodiments, the coil  54  is a flat and/or planar coil. In some embodiments, the coil  54  is a flat coil having a larger lateral extension W/T than its length L or height or vertical thickness L/H, see at least  FIGS.  1 A,  6 A and  6 B . The lateral extension of the coil  54  is measured across or in a direction essentially perpendicular or perpendicular or at least somewhat angled or diverging in relation to the longitudinal direction of the hearing aid  10 . Length or height or thickness L/H of the coil  54  is measured along the longitudinal direction of the hearing aid  10  or at least measured along a direction being essentially in parallel with or in parallel with or at least close to parallel with the longitudinal direction of the hearing aid and if this direction is seen as a vertical direction the length or height or thickness L/H of the coil  54  is a vertical dimension, e.g. vertical length or vertical height or vertical thickness. The plunger  70  is configured to protrude through the center of the charge coil  54  (between its windings  53 ) enabling the architecture and space of small parts and components/hardware making up the hearing aid  10  to be compressed and/or reduced in size enabling making for example a smaller faceplate  30  having less visibility for a user. The coil  54  is mounted concentric to a faceplate mounted control interface of the hearing aid  10  enabling access for external control and visible cues to sub-surface mounted location, i.e. below the faceplate  30 . This enables making a more compact hearing aid  10 . 
     According to an aspect, in the charging station  200  comprising a body  210  and one or more lids  300  and being configured to charge one or more hearing aids  10  according to any of the disclosed aspects/embodiments by means of induction when the hearing aid/-s is/are coupled to the charging station, the body  210  of the charging station is configured to guide or steer or orientate or turn or align the hearing aid/-s  10  (i.e. its shell  20 ) when introduced, i.e. received in a cavity  310  of the charging station, at least roughly into a closely correct or almost correct position as a preparation for a finalized position in the cavity  310  and one or more of the lids  300  of the charging station is configured to guide/steer/orientate the whole hearing aid/-s  10  further/to a higher degree as/when/after its shell  20  is introduced/received in the cavity  310  of the charging station with a finer or vernier or final control into a final set charging position of the hearing aid/-s when the lid is closed. 
     In an embodiment, the module M comprising at least the charging arrangement  50 ,  54  and the at least one microphone arrangement  110  is configured to be enclosed fully inside the cavity  33  of the faceplate  30 , see e.g.  FIG.  5 D . In an embodiment, the module M comprising at least the charging arrangement  50 ,  54  and the at least one microphone arrangement  110  is configured to be enclosed at least partly inside the cavity  33  of the faceplate  30 . In an embodiment, the module M comprising at least the charging arrangement  50 ,  54  and the at least one microphone arrangement  110  is configured to be enclosed at least partly inside the inner space  21  of the shell  20 . In an embodiment, the module M comprising at least the charging arrangement  50 ,  54  and the at least one microphone arrangement  110  is configured to be enclosed at least partly inside the cavity  33  of the face plate  30  and at least partly inside the inner space  21  of the shell  20 . In an embodiment, the module M comprising at least the charging arrangement  50 ,  54  and the at least one microphone arrangement  110  is configured to be arranged flush with the lower face  32  of the faceplate  30 , see e.g.  FIG.  5 D . 
     The person skilled in the art realizes that the present disclosure is not limited to the preferred embodiments described above and below, i.e. the person skilled in the art further realizes that modifications and variations are possible within the scope of the appended claims, for example, only one hearing aid  10  is possible to charge and/or two hearings aids  10  at the same time as shown in  FIG.  7   , or, in some embodiments, one or more plungers  70  is adapted to activate one or more push buttons  61  on one or more integrated circuits  80  when the plunger/-s is/are only pushed or turned and pushed towards the integrated circuit/-s. According to some embodiments, one or more push buttons  61  thereby, via the easy access and handling of the plunger/-s  70 , control various functions of the hearing aid  10  by activating or deactivating one or more integrated circuits  80  when the plunger/-s  70  is/are turned and/or pushed towards the IC/-s  80  and/or its/their push button/-s  61 . According to some embodiments, one or more push buttons  61  thereby activates or deactivates one or more integrated circuits  80  and/or one or more control units  81  when the plunger/-s  70  is/are turned and/or pushed. The charging station  200  is adaptable in some aspects to only charge one hearing aid  10  or more and/or be adapted to only receive one hearing aid. The charger station  200  itself may be a rechargeable device configured to be charged by means of wireless or wired charging. According to embodiments, the order of turning and/or pushing the plunger  70  to engage or disengage from the push button  61  of the IC  80  can be reversed depending on the application in the hearing aid  10 , i.e. the plunger is either first pushed and then turned or first turned and then pushed if both movements are used or both movements are performed simultaneously if pushing the plunger  70  at the same time turns it or if the turning at the same time pushes the plunger, e.g. as a threading-like movement or the like. Pushing the plunger  70  is possible to perform similar to a one click or a two click, such as firstly pushing the plunger inwards towards the integrated circuit and when the push force on the plunger is released, the plunger springs back and then a second and/or more pushes and/or releases of the plunger is/are done. Pushing and/or releasing of the plunger  70  is possible to combine with turning the plunger, e.g. first clockwise and then counter-clockwise and/or first turning the plunger a first distance/angle or length of arc and then a second distance/angle or length of arc in the same direction, this second turn could instead be in a direction opposite the first direction. The movements of the plunger  70  towards/from the IC  80  and its push button  61  enable controlling the hearing aid  10  by changing between and/or activating and/or deactivating different and/or one or more functions of the hearing aid. 
     Items 
     1. A hearing aid ( 10 ) for placement in a user&#39;s ear canal, the hearing aid comprising a shell ( 20 ), a faceplate ( 30 ) comprising an upper face ( 31 ) and a lower face ( 32 ) and a circumference, the upper face being exposed when the shell is placed in a user&#39;s ear, a battery ( 40 ), a coil ( 50 ,  54 ) arranged at the faceplate, a button arrangement ( 60 ,  61 ) comprising a plunger ( 70 ) configured for controlling an integrated circuit ( 80 ) arranged below the coil, said coil comprising one or more windings ( 53 ), the one or more windings being provided circumferential of an inner cavity ( 52 ) of the coil with respect to a center axis (CC) of the coil, said button arrangement ( 60 ,  61 ) being configured such that said plunger in at least one position extends through the inner cavity ( 52 ) of said coil for engaging said integrated circuit, said plunger being operable via the upper face ( 31 ).
 
2. The hearing aid ( 10 ) according to item 1, wherein the plunger ( 70 ) is adapted to activate a push button ( 61 ) on the integrated circuit ( 80 ) when the plunger is pushed towards the integrated circuit.
 
3. The hearing aid ( 10 ) according to item 1 or 2, wherein the plunger ( 70 ) is configured as a control knob adapted to activate said integrated circuit ( 80 ) when turned.
 
4. The hearing aid ( 10 ) according to item 2 or 3, wherein the button arrangement ( 60 ,  61 ,  70 ) is configured to control and/or activate and/or deactivate the hearing aid.
 
5. The hearing aid ( 10 ) according to any preceding item, wherein the coil ( 54 ) is an antenna ( 130 ) for wireless communications and/or wireless charging a battery ( 40 ).
 
6. The hearing aid ( 10 ) according to any preceding item, wherein the plunger ( 70 ) is operable through the upper face ( 31 ) of the faceplate ( 30 ).
 
7. The hearing aid ( 10 ) according to any preceding item, wherein the coil ( 54 ) is an antenna ( 130 ) for wireless communication and configured for charging a battery ( 40 ) wirelessly.
 
8. The hearing aid ( 10 ) according to any preceding item, wherein the hearing aid comprises at least two microphone arrangements ( 110 ).
 
9. The hearing aid ( 10 ) according to any preceding item, wherein said coil ( 54 ) comprises a body ( 51 ) having a cross-section being oval and/or circular and/or elliptical in a plane being perpendicular to the center/longitudinal axis (CC) of the coil.
 
10. The hearing aid ( 10 ) according to item 9, wherein said the body ( 51 ) has a cross-section being circular and/or elliptical in a plane perpendicular to the center/longitudinal coil axis (CC).
 
11. The hearing aid ( 10 ) according to any of items 8 to 10, wherein the shell ( 20 ) is adapted after a user&#39;s auditory canal such that the hearing aid when placed in the ear is always orientated in a specifically predetermined position such that the time delay between sound received by the microphone arrangements ( 110 ) gives an indication of direction from where the sound originate.
 
12. The hearing aid ( 10 ) according to item 9 or 11, wherein the coil ( 54 ) and its body ( 51 ) allow the microphone arrangements ( 110 ) to be situated off-center and/or outside the body.
 
13. The hearing aid ( 10 ) according to any of items 9 to 12, wherein the coil ( 54 ) and its body ( 51 ) allow the microphone arrangements ( 110 ) to be situated off-center and/or outside the oval and/or circular and/or elliptical and/or cylindrical shape of the body.
 
14. The hearing aid ( 10 ) according to any of items  10  to  12 , wherein the coil ( 54 ) and its body ( 51 ) allow the microphone arrangements ( 110 ) to be situated off-center and/or outside the circular and/or elliptical shape.
 
15. The hearing aid ( 10 ) according to item 11, wherein the microphone arrangements ( 110 ) are essentially situated horizontally during use.
 
16. The hearing aid ( 10 ) according to any preceding item, wherein the plunger ( 70 ) in at least one position extends through and beyond/past the length of the coil ( 54 ) and/or the inner cavity ( 52 ) of the coil for engaging the integrated circuit ( 80 ).
 
17. The hearing aid ( 10 ) according to any preceding item, wherein the plunger ( 70 ) is at least partly made of a material being magnetizable.
 
18. The hearing aid ( 10 ) according to any preceding item, wherein the coil ( 54 ) has a radial/(physical) extension perpendicular to its center axis (CC) being larger/greater than its longitudinal/(physical) extension along or in parallel with its centre axis.
 
19. The hearing aid ( 10 ) according to item 18, wherein the coil ( 54 ) has a larger/greater width/breadth (W/T) as measured in a plane perpendicular to its centre axis (CC) than its length/thickness (L/H) as measured in a plane along or in parallel with its centre axis.
 
20. A charging station ( 200 ) comprising a body ( 210 ) and a lid ( 300 ), wherein the charging station is configured to charge a hearing aid ( 10 ) according to any of the preceding items by means of induction when the hearing aid is coupled to the charging station.
 
21. The charging station ( 200 ) according to item 20 comprises a coil configured for magnetizing said plunger ( 70 ) and thereby charging the hearing aid ( 10 ) when the charging station is coupled to the hearing aid.
 
22. A method of producing a charging station ( 200 ) according to item 20 or 21, the method comprising the steps of manufacturing a body ( 210 ) of the charging station ( 200 ), providing the body ( 210 ) with a cavity ( 220 ) being essentially shaped as the hearing aid&#39;s shell ( 20 ), manufacturing a lid ( 300 ) of the charging station ( 200 ), providing the lid ( 300 ) with a cavity ( 310 ) for receiving the hearing aid&#39;s faceplate ( 30 ), providing the lid ( 300 ) with a charging device ( 320 ), the charging device ( 320 ) and the lid ( 300 ) being adapted to mate such that the charging device is able to charge the hearing aid ( 10 ) when the lid ( 300 ) is closed.
 
23. The method according to item 22 comprising the steps of manufacturing a body ( 210 ) of the charging station ( 200 ), providing the body ( 210 ) with a cavity ( 220 ) being essentially shaped as the hearing aid&#39;s shell ( 20 ), manufacturing a lid ( 300 ) of the charging station ( 200 ), providing the lid ( 300 ) with a cavity ( 310 ) being essentially shaped as the hearing aid&#39;s faceplate ( 30 ), providing the lid ( 300 ) with a charging device ( 320 ), the charging device ( 320 ) and the lid ( 300 ) being adapted to mate such that the charging device is able to charge the hearing aid ( 10 ) when the lid ( 300 ) is closed.
 
     Although particular embodiments have been shown and described, it will be understood that they are not intended to limit the present inventions, and it will be obvious to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present inventions. The specification and drawings are, accordingly, to be regarded in an illustrative rather than restrictive sense. The present inventions are intended to cover alternatives, modifications, and equivalents, which may be included within the spirit and scope of the present inventions as defined by the claims.