Method and apparatus for tissue ablation

• US 7,435,250 B2
• Filed: 02/18/2005
• Issued: 10/14/2008
• Est. Priority Date: 04/27/2000
• Status: Expired due to Fees

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Jahns, Scott E., Mehra, Rahul, Francischelli, David E., Hoey, Michael F., Trescony, Paul V., Comben, Richard H., Ocel, Jon M., Pearson, Robert
• Primary Examiner(s): Gibson; Roy D
• Application Number:
  US11/061,425
• Publication Number:
  US 20050143729A1
• Time in Patent Office: 1,334 Days
• Field of Search: 606/41, 606 47- 52, 606/42, 606/46, 606/40, 607101-102
• US Class Current: 606/51
• CPC Class Codes: A61B 18/1445 at the distal end of a shaft, e.g. forceps or scissors at the end of a rigid rod
• CPC Class Codes: A61B 18/1492 having a flexible, catheter-like structure, e.g. for heart ablation A61B18/1477 takes precedence
• CPC Class Codes: A61B 2018/00065 porous
• CPC Class Codes: A61B 2018/00351 Heart
• CPC Class Codes: A61B 2018/00577 Ablation
• CPC Class Codes: A61B 2018/1435 Spiral
• CPC Class Codes: A61B 2018/1472 for use with liquid electrolyte, e.g. virtual electrodes
• CPC Class Codes: A61B 2218/002 Irrigation

Abstract

A device for ablating tissue is provided. The device comprises a conductive element with a channel for irrigating fluid formed therein, which is in contact with a non-conductive microporous interface. All or a portion of the interface may be removable. When the interface is removed, a portion of the conductive element is exposed for use in ablating tissue. Methods of using the device and of removing the interface are also provided.

Claims

1. A device for ablating organic tissue, comprising:

a conductive element;

a fluid component in communication with the conductive element;

an interface positionable adjacent tissue to be ablated to allow the fluid to pass through the interface and contact the tissue to be ablated; and

a maneuvering mechanism comprising a first jaw member and a second jaw member, wherein the first jaw member is movably coupled to the second jaw member, the first and second jaw members configured to receive a portion of tissue to be ablated between the first and second jaw members, wherein the first or second jaw member comprises the conductive element and the interface.

2. The device of claim 1, wherein the conductive element is a metallic coil with a lumen.

3. The device of claim 1, wherein the conductive element is a spring with a lumen.

4. The device of claim 1, wherein the conductive element has a conductive element diameter and the interface has an interface diameter, the conductive element diameter being greater than the interface diameter.

5. The device of claim 1, wherein the interface has a length, the length being variable.

6. The device of claim 1, wherein the interface is micro-porous.

7. The device of claim 1, wherein a portion of the interface may be removed to expose the conductive element.

8. The device of claim 7, wherein the interface is perforated.

9. The device of claim 7, wherein the interface may be rotatably opened.

10. The device of claim 1, wherein the interface comprises openings that may be slidably opened.

11. The device of claim 1, wherein the interface is non-conductive.

12. The device of claim 1, wherein the interface is selected from the group consisting of:

silicones, PTFE, PET fabrics, solvent-precipitated polyurethane micro-porous polymeric coatings, stainless steel nitinol, machining rod stock, polyester fabrics, hydrogels and a gel.

13. The device of claim 1, wherein the interface adapted to lie between the conductive element and the surface of the tissue.

14. The device of claim 1, wherein the interface encircles the conductive element and the fluid component.

15. The device of claim 1, wherein the interface is conductive.

16. The device of claim 1, wherein the interface and the conductive element are the same.

17. The device of claim 1, wherein the conductive element is a wire, the wire located within the fluid component.

18. The device of claim 16, wherein the fluid component is a nonporous coating.

19. The device of claim 18, wherein the interface is a micro-porous section of the non-porous coating.

20. The device of claim 17, wherein the interface is a rigid structure.

21. The device of claim 17, wherein the interface is a fluid saturated gel.

22. The device of claim 21, wherein the interface and the fluid component are the same.

23. The device of claim 1 further comprising:

means for flowing the fluid component through the interface.

24. The device of claim 1 further comprising:

an infusion pump in communication with the fluid component for flowing the fluid component through the interface.

25. The device of claim 1, wherein the maneuvering mechanism is a hemostat-type tool.

26. A device for ablating organic tissue comprising:

a support member comprising a slot;

a conductive wire element, wherein at least a portion of the conductive wire element runs through at least a portion of the slot, wherein at least a portion of the conductive wire element is configured to contact a surface of tissue to be ablated; and

a maneuvering mechanism comprising a first jaw member and a second jaw member, wherein the first jaw member is movably coupled to the second jaw member, the first and second jaw members configured to receive a portion of tissue to be ablated between the first and second jaw members, wherein the first or second jaw member comprises the conductive wire element and the support member, wherein the conductive wire element comprises a coil with a lumen.

27. The device of claim 26, wherein the coil is a spring with a lumen.

28. The device of claim 26, wherein the maneuvering mechanism is a hemostat-type tool.

29. A device for creating ablations of variable length, comprising:

a conductive element having a channel formed therein;

the channel operatively adapted to receive irrigating fluid;

a removable non-conductive interface in communication with the conductive element; and

a maneuvering mechanism comprising a first jaw member and a second jaw member, wherein the first jaw member is movably coupled to the second jaw member, the first and second jaw members configured to receive a portion of tissue to be ablated between the first and second jaw members, wherein the first or second jaw member comprises the conductive element.

30. The device of claim 29 further comprising:

a support element in communication with the conductive element.

31. The device of claim 30, wherein the support element comprises a slot.

32. The device of claim 29, wherein the conductive element is a slotted tube.

33. The device of claim 29, wherein the maneuvering mechanism is a hemostat-type tool.

34. A device for creating ablations of variable length, comprising:

a non-porous tube operatively adapted to receive irrigating fluid therein;

a conductive element in communication with the tube;

a removable non-conductive interface in communication with the conductive element; and

a maneuvering mechanism comprising a first jaw member and a second jaw member, wherein the first jaw member is movably coupled to the second jaw member, the first and second jaw members configured to receive a portion of tissue to be ablated between the first and second jaw members, wherein the first or second jaw member comprises the conductive element.

35. The device of claim 34, wherein the non-conductive interface is a portion of the non-porous tube.

36. The device of claim 35, wherein the non-conductive interface is micro-porous.

37. The device of claim 34, wherein the non-conductive interface is rigid.

38. The device of claim 34, wherein the maneuvering mechanism is a hemostat-type tool.

39. A device for creating ablations of variable length, comprising:

a non-porous tube operatively adapted to receive a hydrogel;

a conductive element in communication with the tube;

a removable non-conductive interface in communication with the conductive element; and

a maneuvering mechanism comprising a first jaw member and a second jaw member, wherein the first jaw member is movably coupled to the second jaw member, the first and second jaw members configured to receive a portion of tissue to be ablated between the first and second jaw members, wherein the first or second jaw member comprises the conductive element.

40. The device of claim 39, wherein the tube is slotted.

41. The device of claim 39, wherein the maneuvering mechanism is a hemostat-type tool.

42. A method of ablating organic tissue, comprising:

providing a device comprising;

a conductive element having a channel formed therein, the channel operatively adapted to receive irrigating fluid;

a removable non-conductive interface in communication with the conductive element; and

a maneuvering mechanism comprising a first jaw member and a second jaw member, wherein the first jaw member is movably coupled to the second jaw member, the first and second jaw members configured to receive a portion of tissue to be ablated between the first and second jaw members, wherein the first or second jaw member comprises the conductive element;

removing a portion of the interface to expose a portion of the conductive element;

placing the tissue between the first and second jaw members;

delivering irrigating fluid to the channel; and

ablating the tissue with the exposed portion of the conductive element.

43. The method of claim 42, wherein the interface is perforated.

44. The method of claim 42, wherein the interface is disposable.

45. The method of claim 42, wherein the interface is reusable.

46. The method of claim 42, wherein the interface is a removable tip.

47. A method of ablating tissue comprising:

providing an ablation device comprising;

a support member comprising a slot;

an ablation element comprising a lumen, wherein at least a portion of the ablation element runs through at least a portion of the slot, wherein at least a portion of the ablation element is configured to contact a surface of tissue to be ablated; and

a maneuvering mechanism comprising a first jaw member and a second jaw member, wherein the first jaw member is movably coupled to the second jaw member, the first and second jaw members configured to receive a portion of tissue to be ablated between the first and second jaw members, wherein the first or second jaw member comprises the ablation element and the support member;

placing the tissue between the first and second jaw members; and

ablating the tissue with the ablation element.

48. The method of claim 47 wherein the first jaw member comprises the ablation element.

49. The method of claim 48 wherein the second jaw member comprises a second ablation element.

50. The method of claim 49 wherein the first and second ablation elements form bipolar electrodes.

51. The method of claim 49 wherein the second jaw member further comprises a second support member comprising a second slot, wherein at least a portion of the second ablation element runs through at least a portion of the second slot, wherein at least a portion of the second ablation element is configured to contact a surface of tissue to be ablated.

52. The method of claim 47 wherein at least a portion of the ablation element is conductive.

53. The method of claim 52 wherein the ablation element comprises a coil.

54. The method of claim 52 wherein the ablation element comprises a spring.

55. The method of claim 52 wherein the ablation element comprises a wire.

56. The method of claim 52 wherein the ablation element comprises a tube.

57. The method of claim 47 wherein the ablation device further comprises a removable non-conductive interface in communication with the ablation element.

58. The method of claim 57 further comprising removing at least a portion of the interface to expose at least a portion of the ablation element.

59. The method of claim 57 wherein at least a portion of the interface is selected from the group consisting of silicone, PTFE, PET, polyurethane, polymeric coatings, polyester fabrics, hydrogels and a gel.

60. The method of claim 57 wherein the interface at least encircles a portion of the ablation element.

61. The method of claim 57 wherein at least a portion of the interface is micro-porous.

62. The method of claim 57 wherein at least a portion of the interface is perforated.

63. The method of claim 47 wherein the tissue is organ tissue.

64. The method of claim 63 wherein the organ tissue is liver tissue.

65. The method of claim 63 wherein the organ tissue is heart tissue.

66. The method of claim 65 wherein the heart tissue is epicardial tissue.

67. The method of claim 65 wherein the heart tissue is endocardial tissue.

68. The method of claim 47, wherein the maneuvering mechanism is a hemostat-type tool.