Abstract:
A method for ablation in which a portion of atrial tissue around the pulmonary veins of the heart is ablated by a first elongated ablation component and a second elongated ablation component movable relative to the first ablation component and having means for magnetically attracting the first and second components toward one another. The magnetic means draw the first and second components toward one another to compress the atrial tissue therebetween, along the length of the first and second components and thereby position the device for ablation of the tissue.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a continuation of U.S. patent application Ser. No. 11/881,443, filed Jul. 27, 2007, which is a continuation of U.S. patent application Ser. No. 11/411,261, filed Apr. 26, 2006, U.S. patent application Ser. No. 10/756,437, filed Jan. 13, 2004, now U.S. Pat. No. 7,094,235, which is a continuation of U.S. patent application Ser. No. 10/016,297, filed Dec. 12, 2001, now U.S. Pat. No. 6,699,240, incorporated herein by reference in their respective entireties. This application also claims priority from U.S. Provisional Patent Application No. 60/286,953, filed Apr. 26, 2001, incorporated herein by reference in its entirety. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    The present invention relates to surgical tools and procedures generally and relates more particularly to the use of ablation to treat atrial fibrillation and other disorders. 
         [0003]    In patients with chronic atrial fibrillation having tachycardia that resistant to medical treatment, the Maze procedure has been employed. This procedure controls propagation of the depolarization wavefronts in the right and left atria by means of surgical incisions through the walls of the right and left atria. The incisions create blind or dead end conduction pathways, which prevent re-entrant atrial tachycardias from occurring. While the Maze procedure is successful in treating atrial fibrillation, the procedure is quite complex and is currently practiced by only a few very skilled cardiac surgeons in conjunction with other open-heart procedures. The procedure also is quite traumatic to the heart, as in essence the right and left atria are cut into pieces and sewn back together, to define lines of lesion across which the depolarization wavefronts will not propagate. 
         [0004]    It has been suggested that procedures similar to the Maze procedure could be instead performed by means of electrosurgical ablation, for example, by applying RF energy to internal or external surfaces of the atria to create lesions across which the depolarization wavefronts will not propagate. Such procedures are disclosed in U.S. Pat. No. 5,895,417, issued to Pomeranz, et al., U.S. Pat. No. 5,575,766, issued to Swartz, et al., U.S. Pat. No. 6,032,077, issued to Pomeranz, U.S. Pat. No. 6,142,944, issued to Swanson, et al. and U.S. Pat. No. 5,871,523, issued to Fleischman, et al, all incorporated herein by reference in their entireties. Hemostat type electrosurgical or cryo-ablation devices for use in performing such procedures are described in U.S. Pat. No. 5,733,280 issued to Avitall, U.S. Pat. No. 6,237,605 issued to Vaska, et al, U.S. Pat. No. 6,161,543, issued to Cox, et al., PCT published Application No. WO99/59486, by Wang and in pending U.S. patent application Ser. No. 09/747,609 filed Dec. 22, 2000 by Hooven, et al., all incorporated herein by reference in their entireties. In order for such procedures to be effective it is desirable that the electrosurgically created lesions are continuous along their length and extend completely through the tissue of the heart. In order for such procedures to be effective it is desirable that the electrosurgically created lesions are continuous along their length and extend completely through the tissue of the heart. Analogous issues arise when attempting to create continuous lines of lesion through the walls of other heart chambers or other organs. 
       SUMMARY OF THE INVENTION 
       [0005]    According to the present invention elongated lesions as might be desired in a maze type procedure or other procedure may be produced using a set of two elongated ablation components carrying means (e.g. an electrode or electrodes) for applying ablation energy (e.g. RF energy) along its length. The ablation components are adapted to be arranged on opposite sides of the walls of the atria or other hollow organs, on either side of the organ walls and to ablate or create lesions in the tissue between the components. The ablation components may also be arranged along opposing external surfaces of an organ, for example opposite sides of an atrial appendage or along opposite sides of the tissue adjacent the bases of the right or left pulmonary veins. 
         [0006]    The ablation components are provided with a magnetic system for drawing the components toward one another to compress the wall or walls of an atrium or other hollow organ therebetween, along the length of the components. In these systems, at least one of the components is provided with a magnet or series of magnets extending along the component. The other component is provided with a ferromagnetic member or preferably another magnet or series of magnets extending along its length, having polarity chosen to assure attraction between the two components. The magnet or magnets may be rigid or flexible and may be formed of magnetic material, e.g. rare earth magnets, or may alternatively be electromagnets. 
         [0007]    In one preferred embodiment of the invention, the two components comprise opposing jaws of an electrosurgical hemostat, provided with elongated RF electrodes and having straight or curved configurations. In some of these embodiments, the jaws of the hemostat are both rigid and the magnets are present primarily to assure good contact and alignment between the jaws, along their length. In other embodiments, one jaw may be rigid and the other flexible, for example to allow it to be temporarily deformed to access desired locations. In these embodiments, magnetic system also assists the flexible jaw in returning to a configuration corresponding to the rigid jaw, as the jaws are brought into proximity to one another. In some embodiments, one jaw may be shapeable, so that the physician can select a desired configuration, with the other jaw being flexible. In these embodiments, the magnetic system allows the flexible jaw to automatically assume a configuration corresponding to the shapeable jaw. In other embodiments, both jaws might be flexible. 
         [0008]    Similar sets of embodiments may be provided wherein the two components are separate from one another, for example mounted to separate handles. Alternatively, a first, external component might be mounted to a handle, to he held by the physician, while a second, internal component may be located on a percutaneously introduced catheter. In these embodiments, the internal component would typically be quite flexible, while the external component would be either rigid or shapeable. In these embodiments the magnetic system allows the internal component to automatically assume a configuration corresponding to the external component, after introduction of the internal component to the interior of the hollow organ. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]      FIG. 1  is a plan view of hemostat of the type in which the present invention may be embodied. 
           [0010]      FIGS. 2A through 2G  illustrate alternative configurations for the jaws of the hemostat of  FIG. 1 , illustrating alternative embodiments of the present invention in cross section and longitudinal section. 
           [0011]      FIG. 3  is a perspective view of a hemostat of a second type, in which the present invention may be usefully practiced. 
           [0012]      FIG. 4  is an illustration of a system employing the invention, including a first external component and a separate second internal component. 
           [0013]      FIGS. 5A through 5D  illustrate alternative embodiments of the distal portion of the internal component illustrated in  FIG. 4 , in cross section and longitudinal section. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0014]      FIG. 1  is a plan view illustrating a bipolar electrosurgical hemostat of a type in which the present invention may usefully be practiced. The hemostat is provided with handles  14  and  12 , coupled to pivoting jaws  16  and  18 , respectively. Located along jaws  16  an  18  are ablation electrodes  20  and  22 , which, as discussed below, take the form of RF electrodes. In alternative embodiments, electrodes  20  and  22  may be employed to apply microwave radiation, or might be replaced by elongated heating or cooling elements to provide for thermal or cryo-ablation along their length. In the embodiment illustrated, the electrodes are irrigated RF electrodes, allowing for delivery of saline or other conductive fluid along their lengths, generally according to the mechanism as described in U.S. Pat. No. 6,096,037 issued to Mulier, incorporated herein by reference in its entirety. Each electrode is provided with a fluid delivery lumen  30 ,  32 , through which the saline or other conductive fluid is delivered to the electrodes. Lumens  30  and  32  are coupled to a luer fitting  34 , which may be coupled to a source of conductive fluid. Separate luer fittings for each of lumens  30 ,  32  might alternatively be provided. Similarly, each electrode is provided with conductors  24 ,  26  allowing the electrodes to be coupled to a source of ablation energy via electrical connector  28 , as noted above. The source of ablation energy may provide RF energy or microwave energy. In alternative embodiments in which electrodes  20  and  22  are replaced by heaters, the fluid delivery lumens may not be provided, and instead, electrical conductors  24  and  26  may be coupled to two elongated resistive heaters arranged along jaws  16  and  18 , and coupled to an electrical power source via connector  28 . In alternative embodiments in which elongated cooling elements are substituted for electrodes  20  and  22 , cooling fluid might be delivered to electrodes via fluid lumens  30  and  32  or alternatively, in the event electrical cooling devices are provided, electrical power might be delivered to the cooling devices via connectors  24  and  26  through electrical connector  28 . 
         [0015]    While the discussion below focuses on ablation systems in which the particular ablation energy delivered is RF energy, delivered via irrigated electrodes, it should be understood that the present invention can usefully be practiced in conjunction with the other forms of ablation energy referred to above. As such, for purposes of the following discussion, the illustrated and described irrigated RF electrodes should be taken as exemplary of a mechanism for applying ablation energy according to the present invention, rather than as limiting. 
         [0016]    Jaws  16  and  18  may have a straight configuration as illustrated, or may be curved. Jaws  16  and  18  are preferably manufactured of a non-ferromagnetic material such a biocompatible plastic, and, as discussed below, carry an elongated magnet or series of magnets, extending along the electrodes  20  and  22 , in order to assist in aligning the electrodes relative to one another on opposite sides of tissue to be ablated and to assist in compressing tissue between the electrodes to assure good contact along their length. As described in more detail, jaws  16  and  18  may be rigid, shapeable, or flexible, depending on the particular embodiment of the invention being practiced. 
         [0017]      FIGS. 2A through 2G  illustrate various alternative embodiments of the invention, employing different types of magnetic alignment systems and different configurations for the first and second components (in this case the jaws  16  and  18 ), along which ablation energy is to be applied.  FIG. 2A  illustrates a cross sectional view through jaws  16  and  18  of the hemostat of  FIG. 1 , in which the electrodes  20  and  22  take the form of elongated electrode coils  100 ,  102 , respectively, carrying internal porous tubes  104  and  106 . Tubes  104  and  106  may be fabricated, for example, of porous polytetrafluoroethylene (PTFE), and have their internal lumens coupled to the fluid lumens  30  and  32  illustrated in  FIG. 1 . By this mechanism, delivery of conductive fluid such as saline solution along the length of the electrode coils  101  and  102  may be accomplished. While as described, the electrodes  20  and  22  each include a single elongated electrode coil embodiments in which the components (jaws  16  and  18 ) are provided with multiple electrodes arranged along their length are also within the scope of the present invention. 
         [0018]    As illustrated, jaws  16  and  18  are each provided with a pair of magnets or a series of magnets  108 ,  110 ,  112 ,  114 , which extend along the jaws  16  and  18 . These magnets, shown in cross section, may either be individual elongated magnets or may be a series of shorter magnets, extending along the jaws. The polarities of magnets correspond to the “N” and “S” markings as illustrated, arranged such that the jaws  16  and  18  are attracted to one another along their lengths. Provision of magnets on both sides of the electrodes  18  and  20  assist in assuring that the electrodes will center themselves with respect to one another so that the electrodes will be located directly across from one another when placed on opposite sides of tissue to be ablated. The magnets also assist in compressing the jaws of the hemostat along their length, assuring good contact with the tissue along the length of the jaws. 
         [0019]    Jaws  16  and  18  are preferably fabricated of a non-ferromagnetic material, such as a plastic, so that the magnets and electrode coils as illustrated may be insulated from one another. In some embodiments, both jaws  16  and  18  may be rigid and may be pre-formed with the same configuration so that they are parallel to one another. Alternatively, one of jaws  16  and  18  may be rigid, while the other of the two jaws may be quite pliant or flexible, so that upon placement of the jaws on either side of the wall of a hollow organ to be ablated, the magnetic force provided by the magnets causes the flexible jaw to assume a configuration parallel to the rigid jaw and to compress the wall of the hollow organ between the jaws. In additional alternative embodiments, one of the two jaws  16  and  18  may be shapeable by the physician, to assume a desired configuration, with the other of the two jaws being flexible. In this embodiment as well, the flexible jaw is aligned and configured parallel to the shapeable jaw when the two jaws are brought towards one another on either side of the wall of the hollow organ to be ablated. The shapeable jaw may be shapeable by virtue of the material chosen to fabricate the jaw, or means of a shapeable insert, for example, a longitudinally extending rod of nitinol, stainless steel, or other shapeable metal, not illustrated in  FIG. 2A . 
         [0020]      FIG. 2B  illustrates an alternative embodiment of an invention according to the present invention, similarly showing a cross section through jaws  16  and  18  of the hemostat of  FIG. 1 . All elements correspond to identically numbered elements in  FIG. 2A . In this embodiment, only a single elongated electrode or line of electrodes  116 ,  118  is provided for each of the two jaws  16 ,  18  respectively. This configuration allows for a reduction in the overall size of the jaws, but otherwise functions as described in conjunction with  FIG. 2A . In  FIG. 2B , an optional metallic shaping wire  120  is shown, mounted adjacent to the magnet or magnets  118 , to allow the physician to shape jaw  18 . In embodiments in which this shaping wire is present, it is to be expected that jaw  16  would be flexible, and would conform to the configuration provided to jaw  18  by the physician, after placement of the jaws on opposite sides of tissue to be ablated. 
         [0021]      FIG. 2C  illustrates a third alternative embodiment of the present invention, also taking the form of a cross section through jaws  16  and  18  of the hemostat of  FIG. 1 . Identically, numbered components correspond to those illustrated in  FIG. 2A . In this embodiment, elongated magnets or series of magnets  122  and  124  are located within the porous fluid lumens  106  and  104 , so that magnetic force applied to draw the jaws  16  and  18  toward one another is applied centered with respect to the electrode coils  100  and  102 . The various alternative embodiments discussed above in conjunction with  FIGS. 2A and 2B  may correspondingly be provided in conjunction with the jaws having the general configuration illustrated in  FIG. 2C . 
         [0022]    As illustrated in  2 A,  2 B and  2 C, the magnets are arranged so that the south pole(s) of the magnet(s) of one jaw are adjacent to the north pole(s) of the magnet(s) of the other jaw. This configuration will be most desirable in conjunction with embodiments in which single, elongated magnets extend essentially along the length of the jaws, and also in embodiments in which a series of shorter, closely spaced magnets extending along the jaws is provided. In embodiments in which magnets extend along the jaw but are more substantially spaced from one another, the polarity of the magnets may be altered, so that along one jaw, the north poles of the magnets may be located at the distal ends of the magnets and the south poles located at the proximal ends wherein on the other jaw, the south poles of the magnets will be located at their distal ends and north poles of the magnets will be located at proximal ends. Alternative magnetic configurations such as this may be employed in any of the embodiments illustrated in  FIGS. 2A ,  2 B and  2 C in which the magnets take the form of series of spaced, magnets, running along the lengths of the jaws. 
         [0023]    The magnets themselves may be of any appropriate magnetic material. One particularly desirable set of magnetic materials for use in the present invention may be rare earth magnets, due to their extraordinary strength for relatively small sizes and weights. However, elongated flexible magnets might be substituted, as well as ceramic magnets. In addition, as discussed in more detail below, the magnets may be replaced with electromagnetic coils. In further alternative embodiments, it may be possible to employ magnets located in only one of the jaws, substituting a ferromagnetic material such as magnetic stainless steel for the other of the two magnets. For example, in the embodiment illustrated in  FIG. 2A , magnets  108  and  110  might be replaced be elongated magnetic stainless steel members. In such an embodiment, the elongated stainless steel members would be attracted to the magnets  112  and  114  as described below and might also be employed to provide the ability to shape the jaw  116  to a desired configuration. Similar substitutions of non-magnetized ferromagnetic materials for the magnets illustrated in  FIGS. 2B and 2C  are also believed within the scope of the present invention. 
         [0024]      FIG. 2D  is a longitudinal sectional view through jaw  18  of the hemostat of  FIG. 1 . In this embodiment, the magnets  112  and  114  take the form of a series of magnets, mounted within the body of jaw  18 . Electrode coil  102  and fluid lumen  106  are also illustrated in longitudinal section. 
         [0025]      FIG. 2E  illustrates an alternative longitudinal sectional view through jaw  18 , otherwise as illustrated in  FIGS. 1 and 2A . Components corresponds to identically numbered components in  FIG. 2A . In this embodiment, however, jaw  18  is provided with indentations  126  in between the individual magnets  114  and  112 . These indentations, in conjunction with fabrication of the jaw  18  of the flexible material, define hinge points, facilitating bending of the jaw  18 . Such a configuration will be particularly desirable in the event that jaw  16  as illustrated in  FIGS. 1 and 2A  were to be made rigid or shapeable, with jaw  18  being flexible enough to adapt to the configuration of jaw  16 , when placed on the opposite side of tissue to be ablated. 
         [0026]      FIG. 2F  is a longitudinal sectional view through a hemostat having a jaw configuration as illustrated in  FIG. 2C . Components correspond to identically numbered components in  FIG. 2C . In this view, the magnet  122  takes the form of a series of magnets located within fluid lumen  104 . 
         [0027]      FIG. 2G  illustrates a longitudinal section through an embodiment of the present invention having a jaw configuration as illustrated in  FIG. 2B . In this embodiment, the magnet  118  take the form a series of magnets  118 , located along side the shaping wire  120 . Electrode coil  102  and fluid lumen  104  are also visible. 
         [0028]    In the embodiments of  FIGS. 2D ,  2 F and  2 G, it should be understood that elongated continuous magnets, flexible or rigid might be substituted for a series of individual magnets as illustrated. In addition, it should also be understood that in some embodiments, the magnets as illustrated might be more widely spaced from another, and arranged so that their north/south magnetic access extends longitudinally along the lengths of the jaws, as described above in conjunction with  FIGS. 2A through 2C . In such embodiments, the north/south magnetic axes of the magnets in one jaw would be opposite those of the magnets in the other jaw. Jaws employing this arrangement of magnets might also be used in conjunction with a jaw or other ablation component taking the form of a series of electro magnets, for example, coils having their axes extending along the axes of the jaws or other ablation components. 
         [0029]      FIG. 3  is a perspective view of a bipolar electrosurgical hemostat of a second type, appropriate for use in conjunction with the present invention. In this embodiment the hemostat is provided with handles  212  and  214  and elongated jaws  216  and  218 . In this case, jaw  218  carries a circular ablation component  238 , along which an electrode  220  is arranged. Jaw  216  is provided with a hook shaped ablation component  236 , carrying a corresponding electrode facing electrode  220 . The instrument of  FIG. 3  is particularly adapted for ablations and circling the bases of the pulmonary veins, in the context of an electrosurgical procedure analogous to a maze procedure as discussed above. In this embodiment, it may be desirable that the circular ablation component  238  is either rigid or shapeable by the physician, to allow adaptation of the configuration of the component to this particular anatomy of the patient involved. Component  236  is preferably at least flexible enough to be spread open slightly to facilitate placing of the jaw around the basis of the pulmonary veins and may be quite flexible, relying on the magnetic attraction between components  236  and  238  and to cause component  236  to assume a configuration parallel to component  238 . As in conjunction with the hemostat illustrated in  FIG. 1 , fluid lumens  230  and  232  are provided to allow delivery of a conductive fluid to the electrodes, via luer fitting  234 . Electrical conductors  224  and  226  are provided to conduct electrical energy to the electrodes, via electrical connector  228 . As discussed above in conjunction with the hemostat of  FIG. 1 , alternative means for applying ablation energy such as microwave antenna or heaters or coolers to provide thermal or cryo-ablation may be substituted for the electrodes. 
         [0030]      FIG. 4  illustrates an additional alternative embodiment of the invention, in which the two ablation components are separate from one another rather than being joined as in the hemostats of  FIGS. 1A and 3 . In this embodiment, the first component corresponds generally to jaw  216  of the hemostat of  FIG. 3 , provided in this case with a handle  312  allowing the physician to manipulate the device. An electrode  320  extends around the curved ablation component  318 , and may be, as discussed above, an irrigated electrosurgical electrode, provided with fluid via lumen  332  and luer fitting  334  and provided with electrical power via conductors  326  and electrical connector  328 . In use, the curved ablation component  318  will be placed on the exterior surface of the organ to be ablated, for example, placed around the bases of a patient&#39;s pulmonary veins. In this particular embodiment, the curved ablation component  318  is preferably rigid or malleable, as the internal ablation component  304 , as discussed below, will be quite flexible. 
         [0031]    The internal ablation component  304  takes the form of a catheter having an elongated catheter body  414  carrying an electrode along its distal portion  420 . Distal portion  420  may have a structure corresponding generally to the illustrated structures for the jaws of the hemostats as illustrated in  FIGS. 2A through 2G , with the caveat that the structure of a distal portion  420  of the catheter should be fabricated of a sufficiently flexible material that it may be introduced percutaneously and navigated to the desired location within the organ to be ablated. For example, the catheter might be advanced through the vascular system to the interior of the left atrium, to a position adjacent the openings into the pulmonary veins. Alternatively, as illustrated in  FIGS. 5A  through D below, the distal portion  420  of the catheter may be specifically optimized for location at the distal portion of a catheter. As illustrated, the proximal end of the catheter is provided with a fitting  416  carrying a fluid coupling  434  allowing delivery of saline or other conductive fluid to the electrode located along the distal portion  420  of the catheter. Electrical power is provided to the electrode by means of conductors  426  and connector  428  in a fashion analogous to that described above for the other embodiments. 
         [0032]      FIGS. 5A-5D  illustrate various alternative configurations for the distal portion  4120  of the catheter  304  illustrated in  FIG. 4 . The embodiments of the invention as illustrated in  FIGS. 5A-5D  may also be employed in external ablation components as illustrated in  FIG. 4  or in hemostat type devices as illustrated in  FIGS. 1 and 3 . 
         [0033]      FIG. 5A  is cross sectional view through the distal portion  420  of the catheter illustrated in  FIG. 4 , showing a first embodiment of invention particularly optimized for use as part of a percutaneously introduced catheter. In this embodiment, the outer surface of the distal portion comprises a porous tube  404 , which may be made of PTFE as discussed above, surrounding an electrode coil  402 . A magnet or series of magnets  406  is mounted within the lumen of the electrode coil  402 . In this embodiment, fluid is delivered through the lumen of the electrode coil  402 , permeates through the porous wall of tube  404 , and electrical energy provided by electrode  402  is coupled to the tissue to be ablated via the conductive fluid in the wall and on the surface of tube  404 . As illustrated, the electrode is shown having its magnetic polarity such that its north/south axis runs transverse to the axis of the catheter. However, alternative embodiments employing a series of spaced magnets having their north/south axis running along the axis of the catheter are also within the scope of the invention. 
         [0034]      FIG. 5B  shows an alternative cross section through the distal portion  420  of the catheter  FIG. 4 . Numbered elements correspond to identically numbered elements in  FIG. 5A . In this embodiment, however, a shaping wire  410  is shown, allowing the physician to provide a desired configuration to the distal portion  420  of the catheter. For example, the catheter may be biased to assume a generally circular configuration, which is straightened during the passage of the catheter through the vascular system, with shaping wire  410  allowing it to resume its desired configuration when no longer retrained by vascular system. 
         [0035]      FIG. 5C  shows an additional alternative cross section through the distal portion  420  of the catheter  FIG. 4 . Numbered elements correspond to identically numbered elements in  FIG. 5A . In this embodiment, coil  412 , however is not an ablation electrode but instead is employed as an electromagnet to attract the catheter to an associated external ablation component. Delivery of ablation energy, e.g. RF or microwave, is accomplished by central wire  418 . 
         [0036]      FIG. 5D  shows a longitudinal sectional view through the distal portion  420  of a catheter having a cross section as illustrated in  FIG. 5C . Numbered elements correspond to identically numbered elements in  FIG. 5C . In this view it can be seen that coil  412  is one of a series of spaced electromagnet coils spaced along the distal portion  420  of the catheter. As illustrated, coils  412  are wired in series, however, in alternative embodiments they may be wired for individual activation.