Suction Force Ablation Device

• US 20090299364A1
• Filed: 04/21/2009
• Published: 12/03/2009
• Est. Priority Date: 04/21/2008
• Status: Abandoned Application

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Batchelor, Kester, Daigle, Tom, Haeg, Dan, Rothstein, Paul, Francischelli, David, Podbelski, Adam, Ramberg, Steve, Conway, Tom, Ahlberg, Sarah
• Application Number:
  US12/427,457
• Publication Number:
  US 20090299364A1
• Time in Patent Office: Days
• US Class Current: 606/41
• 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 2018/00113 with foam
• CPC Class Codes: A61B 2018/00291 using suction
• CPC Class Codes: A61B 2018/00351 Heart
• CPC Class Codes: A61B 2018/00642 with feedback, i.e. closed loop control
• CPC Class Codes: A61B 2018/00702 Power or energy
• CPC Class Codes: A61B 2018/00726 Duty cycle
• CPC Class Codes: A61B 2018/00863 Fluid flow
• CPC Class Codes: A61B 2018/1472 for use with liquid electrolyte, e.g. virtual electrodes
• CPC Class Codes: A61B 2090/064 for measuring force, pressure or mechanical tension
• CPC Class Codes: A61B 2218/002 Irrigation
• CPC Class Codes: A61B 2218/007 Aspiration

Abstract

An ablation device for ablating tissue having an outer wall and an inner wall, approximately parallel and concentric with said outer wall, defining an inner fluid chamber and an outer low pressure chamber. Each of the outer wall and the inner wall have an edge defining an open face of the fluid chamber and the low pressure chamber. An ablative element is contained within the fluid chamber. A source of low pressure is coupled to the low pressure chamber. When the edge of the outer wall and the edge of the inner wall contact a surface, the ablation device is at least partially secured to the surface by low pressure created in the low pressure chamber by the source of low pressure. The fluid chamber is at least partially fluidly isolated from the low pressure chamber when the ablation device is at least partially secured to the surface.

Claims

1. A suction force ablation device suitable for use with an organic tissue, said device comprising:

a first recessed area configured to form a first chamber when said device is urged against said tissue;

a second recessed surface configured to form a second chamber, concentric with said first chamber, when said device is urged against said tissue, wherein said first and second chambers are fluidically isolated from each other; and

an electrode disposed within said second chamber

wherein said first chamber is under a low pressure than said second chamber said first chamber and is configured to provide a suction force against said tissue.

2. The device of claim 1 wherein said first recessed area and said second recessed areas are each surrounded by a wall.

3. The device of claim 2 wherein said wall is configured to be flexible and conform to said tissue.

4. The device of claim 3 wherein said wall is constructed from a flexible closed cell foam.

5. The device of claim 2 wherein a common wall separated said first recessed area and said second recessed area.

6. The device of claim 5 wherein said first recessed area surrounds said second recessed area.

7. The device of claim 1 wherein said electrode is electrically coupled to a power source.

8. The device of claim 1 wherein an irrigation fluid is introduced into said first chamber from an irrigation source.

9. The device of claim 8 wherein said electrode is a fluid eluting polymer fluidly coupled to said irrigation source.

10. A suction force ablation device suitable for use with an organic tissue, said device comprising:

a housing having first upstanding wall and a second upstanding wall, said first upstanding wall being concentric with said second upstanding wall;

a first recessed portion surrounded by said first wall;

an electrode disposed within said first wall;

a vent within said first wall, wherein said vent is in fluid communication with atmospheric pressure through another vent on said housing;

a second recessed portion surrounded by said first wall and said second wall; and

a suction port disposed between said first and second walls, wherein said suction port is configured to provide a suction force.

11. The device of claim 10 wherein said second wall surrounds said second recessed layer and said first wall.

12. The device of claim 10 wherein said device is configured to be urged against tissue and form a first chamber surrounded by said first wall and said second wall and a second chamber surrounded by said first walls, wherein said first chamber surrounds said entire second chamber.

13. The device of claim 10 wherein said housing further includes a connector portion.

14. An ablation device for ablating tissue, comprising:

an outer wall and an inner wall, approximately parallel and concentric with said outer wall, defining an inner fluid chamber and an outer low pressure chamber, each of said outer wall and said inner wall having an edge defining an open face of said fluid chamber and said low pressure chamber;

an ablative element contained within said fluid chamber; and

a source of low pressure coupled to said low pressure chamber;

wherein, when said edge of said outer wall and said edge of said inner wall contact a surface, said ablation device is at least partially secured to said surface by low pressure created in said low pressure chamber by said source of low pressure;

said fluid chamber being at least partially fluidly isolated from said low pressure chamber when said ablation device is at least partially secured to said surface.

15. The ablation device of claim 14 further comprising a source of fluid delivered to said fluid chamber.

16. The ablation device of claim 15 wherein said source of fluid comprises a reservoir fluidly coupled to said fluid chamber.

17. The ablation device of claim 15 wherein the fluid is a conductive fluid.

18. The ablation device of claim 15 further comprising a fluid removal lumen fluidly coupled to said fluid chamber.

19. The ablation device of claim 14 wherein a fluid chamber pressure is greater than a low pressure chamber pressure.

20. The ablation device as in claim 14 wherein said outer wall comprises a flange which contacts said surface.

21. The ablation device as in claim 20 wherein said flange is flexible.

22. The ablation device as in claim 20 wherein said flange is curved.

23. The ablation device as in claim 14 wherein said outer wall comprises a bellows.

24. The ablation device as in claim 23 wherein said bellows is a single bellows.

25. The ablation device as in claim 23 wherein said bellows is a double bellows.

26. The ablation device as in claim 14 wherein said low pressure chamber is defined by a gap between said outer wall and said inner wall and said fluid chamber is defined by said inner wall.

27. The ablation device as in claim 26 wherein said low pressure chamber forms a concentric ring around said fluid chamber.

28. The ablation device as in claim 15 wherein said ablative element comprises an electrode.

29. The ablation device as in claim 28 wherein said electrode comprises a porous material.

30. The ablation device as in claim 29 further comprising a fluid conduit coupled to said porous material of said electrode configured to deliver fluid to said porous material of said electrode.

31. The ablation device as in claim 14 further comprising a pressure sensor, coupled to a component of said ablation device, which generates a signal indicative of pressure in at least one of said fluid chamber and said low pressure chamber.

32. The ablation device as in claim 31 wherein said pressure sensor generates a signal indicative of pressure in said low pressure chamber.

33. The ablation device as in claim 32 further comprising a controller operatively coupled to said ablative element and said pressure sensor, said controller operating said ablative element based, at least in part, on said signal indicative of pressure.

34. The ablation device as in claim 33 wherein said controller ceases operation of said ablative element if said signal indicative of pressure is less than a minimum pressure value.

35. The ablation device as in claim 33 wherein said controller begins operation of said ablative element based, at least in part, on said signal indicative of pressure is greater than a minimum pressure value.

36. The ablation device as in claim 31 wherein said pressure sensor is positioned in said low pressure chamber.

37. The ablation device as in claim 31 wherein said pressure sensor generates a signal indicative of attachment of said ablation device to said tissue.

38. The ablation device as in claim 34 further comprising a controller operatively coupled to said ablative element and said pressure sensor, said controller operating said ablative element based, at least in part, on said signal indicative of attachment.

39. The ablation device as in claim 15 further comprising a flow sensor, operably coupled to a component of said ablation device, which generates a signal indicative of a flow of said fluid in at least one of said fluid chamber and said low pressure chamber.

40. The ablation device as in claim 39 wherein said flow sensor generates a signal indicative of fluid flow in said low pressure chamber.

41. The ablation device as in claim 40 further comprising a controller operatively coupled to said ablative element and said flow sensor, said controller operating said ablative element based, at least in part, on said signal indicative of fluid flow.

42. The ablation device as in claim 41 wherein said controller ceases operation of said ablative element if said signal indicative of fluid flow is less than a minimum flow value.

43. The ablation device as in claim 41 wherein said controller begins operation of said ablative element based, at least in part, on said signal indicative of fluid flow is greater than a minimum flow value.

44. The ablation device as in claim 39 wherein said flow sensor is positioned in said fluid chamber.

45. The ablation device as in claim 14 wherein said source of low pressure is fluidly coupled to said low pressure chamber with a suction port.

46. The ablation device as in claim 45 further comprising an anti-occlusion structure to prevent occlusion of said suction port by said tissue.

47. The ablation device as in claim 46 wherein said anti-occlusion structure comprises a mesh screen positioned between said suction port and said tissue.

48. The ablation device as in claim 46 wherein said anti-occlusion structure comprises a post positioned proximate said suction port approximately parallel with said inner wall.

49. The ablation device as in claim 46 wherein said anti-occlusion structure comprises a plurality of posts positioned within said low pressure chamber approximately parallel with said inner wall.

50. A method of ablating tissue with an ablation device as in claim 14, comprising the steps of:

placing said open face of said fluid chamber and said low pressure chamber against said tissue;

then

creating low pressure in said low pressure chamber, thereby at least partially securing said ablation device to said tissue and at least partially fluidly isolating said fluid chamber from said low pressure chamber; and

then

ablating said tissue with said ablation element.

51. The method of claim 50 wherein said creating low pressure step completely fluidly isolates said fluid chamber from said low pressure chamber.

52. The method of claim 50 further comprising the step of delivering a source of fluid to said fluid chamber.

53. The method of claim 52 wherein the step of delivering a source of fluid to said fluid chamber comprises delivering said fluid through a reservoir fluidly coupled to said fluid chamber.

54. The method of claim 52 wherein the step of delivering a source of fluid step delivers a conductive fluid.

55. The method of claim 54 wherein said ablative element comprises a porous material, and wherein said delivering a source of fluid step delivers said conductive fluid through said porous material.

56. The method of claim 52 further comprising the step of removing said fluid from said fluid chamber.

57. The method of claim 50 wherein said creating low pressure step creates said low pressure having a pressure lower than a pressure in said fluid chamber.

58. The method of claim 50 wherein said outer wall comprises a flange which contacts said tissue, and further comprising the step of conforming said flange to conform to said tissue.

59. The method of claim 50 wherein said ablation device further comprises a pressure sensor, coupled to said ablation device, which generates a signal indicative of pressure, and wherein said ablating step occurs based, at least in part, on said signal indicative of pressure.

60. The method of claim 59 wherein said ablation device further comprises a controller operatively coupled to said pressure sensor, and wherein said controller executes said ablation step based, at least in part, on said signal indicative of pressure.

61. The method of claim 50 wherein said ablation device further comprises a flow sensor, coupled to said ablation device, which generates a signal indicative of fluid flow, and wherein said ablating step occurs based, at least in part, on said signal indicative of pressure.

62. The method of claim 61 wherein said ablation device further comprises a controller operatively coupled to said pressure sensor, and wherein said controller executes said ablation step based, at least in part, on said signal indicative of fluid flow.