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1. (WO2007005929) SYSTEME ET INSTRUMENT ELECTROCHIRURGICAUX COMPORTANT DE MULTIPLES ELECTRODES
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS
We claim:

1. An electrosurgical instrument for conveying electrosurgical power to tissue to achieve a predetermined electrosurgical effect, comprising an electrosurgical blade, the electrosurgical blade comprising:
an active electrode having a first section, a first tapered section terminating at a first conductor edge, and a first electrical coupling surface for electrically coupling the active electrode to a handle;
a first insulation layer having a second tapered section overlaying the active electrode which tapers on a side of the first tapered section to expose the first conductor edge;
a return electrode electrically isolated from the active electrode, the return electrode having a third section, a third taper section terminating at a second conductor edge, and a second electrical coupling surface for electrically coupling the return electrode to the handle;
a second insulation layer having a fourth tapered section overlaying the return electrode which tapers on a side of the third tapered section to expose the second conductor edge; and
a passive electrode electrically isolated from the active electrode and the return electrode, the passive electrode having a third electrical coupling surface for electrically coupling the passive electrode to the handle.

2. The electrosurgical instrument as recited in claim 1, wherein at least a portion of the thickness of the first conductor edge is less than that of the first section.

3. The electrosurgical instrument as recited in one of claims 1-2, wherein at least a portion of the first conductor edge is flush with the first insulating layer near the first conductor edge.

4. The electrosurgical instrument as recited in one of claims 1-3, wherein at least a portion of the first tapered section includes a beveled surface.

5. The electrosurgical instrument as recited in one of claims 1-3, wherein at least a portion of the first tapered section includes two beveled surfaces.

6. The electrosurgical instrument as recited in one of claims 1-5, wherein at least a portion of the first tapered section has a concave shape.

7. The electrosurgical instrument as recited in one of claims 1-6, wherein at least a portion of the second tapered section has a concave shape.

8. The electrosurgical instrument as recited in one of claims 1-7, wherein at least a portion of the first tapered section has a concave shape.

9. The electrosurgical instrument as recited in one of claims 1-8, wherein at least a portion of the second tapered section has a concave shape.

10. The electrosurgical instrument as recited in one of claims 1-6, wherein at least a portion of the second tapered section insulation layer has a linear taper shape

11. The electrosurgical instrument as recited in one of claims 1-8, wherein at least a portion of the third tapered region has a convex shape.

12. The electrosurgical instrument as recited in one of claims 1-11 having an insulation angle less than about 60 degrees.

13. The electrosurgical instrument as recited in one of claims 1-11 having an insulation angle less than about 45 degrees.

14. The electrosurgical instrument as recited in one of claims 1-11 having an insulation angle less than about 20 degrees.

15. The electrosurgical instrument as recited in one of claims 1-14, wherein each of the first and second conductor edges has a thermal conductivity of at least 0.0002 W/°K at about 300 0K.

16. The electrosurgical instrument as recited in one of claims 1-15, wherein at least a portion of the first conductor edge has a transverse cross section that comes to approximately a point.

17. The electrosurgical instrument as recited in one of claims 1-16, wherein at least a portion of the second conductor edge has a transverse cross section that comes to approximately a point.

18. The electrosurgical instrument as recited in one of claims 1-17, wherein at least a portion of the first conductor edge has a transverse cross section that forms an acute angle.

19. The electrosurgical instrument as recited in one of claims 1-18, wherein at least a portion of the second conductor edge has a transverse cross section that forms an acute angle.

20. The electrosurgical instrument as recited in one of claims 1-19, wherein at least a portion of the first conductor edge has a thickness less than about 0.005 inches.

21. The electrosurgical instrument as recited in one of claims 1-19, wherein at least a portion of the first conductor edge has a thickness less than about 0.002 inches.

22. The electrosurgical instrument as recited in one of claims 1-19, wherein at least a portion of the first conductor edge has a thickness less than about 0.0005 inches.

23. The electrosurgical instrument as recited in one of claims 1-22, wherein at least a portion of the thickness of the insulation layer within a primary reaction region is at least one half the thickness of the conductor edge.

24. The electrosurgical instrument as recited in one of claims 1-23, wherein the thickness of the first insulation layer a primary reaction region is at least as thick as the first conductor edge.

25. The electrosurgical instrument as recited in one of claims 1-24 wherein the ratio of width of a first section to at least a portion of the first conductor edge is at least 5:1

26. The electrosurgical instrument as recited in one of claims 1-24 wherein the ratio of width of a first section to at least a portion of the first conductor edge is 20:1

27. The electrosurgical instrument as recited in one of claims 1-26, wherein at least one side of the first tapered section extends radially inward.

28. The electrosurgical instrument as recited in one of claims 1-27, wherein at least one side of the third tapered section extends radially inward.

29. The electrosurgical instrument as recited in one of claims 1-28, wherein the electrosurgical blade is configured for single use.

30. The electrosurgical instrument as recited in claim 29, wherein the electrosurgical blade is enclosed in a sterile package.

31. The electrosurgical instrument as recited in one of claims 1-28, further comprising the handle coupled to the electrosurgical blade.

32. The electrosurgical instrument as recited in claim 31. further comprising an electrical couple unit which couples the electrosurgical instrument to a radio frequency power source.

33. The electrosurgical instrument as recited in one of claims 31-32, further comprising a coupling mechanism to securely and electrically couple the
electrosurgical blade to the handle, wherein the coupling mechanism also couples the active electrode and the return electrode to a radio frequency power source and to a negative voltage source and couples the passive electrode to a positive voltage source.

34. The electrosurgical instrument as recited in one of claims 31-33, further comprising
a radio frequency (RP) power source electrically coupled to the active electrode and the return electrode; and
a DC voltage source providing a negative voltage coupled to the active electrode and the return electrode and a positive voltage coupled to the passive electrode.

35. The electrosurgical instrument as recited in claim 34, wherein the DC voltage source comprises a rectifier circuit configured to receive RF power from the RF power source and output the negative voltage and the positive voltage.

36. The electrosurgical instrument as recited in claim 35, wherein the rectifier circuit is positioned within the handle.

37. The electrosurgical instrument as recited in one of claims 34-36, further comprising an independent power source coupled to the radio frequency power source.

38. The electrosurgical system as recited in claim 37, further comprising an inverter electrically coupled between the independent power source and the RF power source.

39. The electrosurgical system as recited in one of claims 37-38, wherein the RF power source includes an electrical couple for connecting to a mains power source and the RF power source is configured to operate on AC power.

40. The electrosurgical system as recited in claim 39, wherein the independent power source and inverter are configured to operate as a backup power supply configured to provide AC power to the RF power supply when the mains power source fails.

41. The electrosurgical system as recited in one of claims 39-40, further comprising a rectifier configured to receive AC power from the external mains power source and charge the independent power source when external AC power is available

42. The electrosurgical system as recited in one of claims 38-41, wherein the independent power supply comprises a battery.

43. The electrosurgical system as recited in one of claims 38-42, wherein the independent power supply comprise a fuel cell.

44. The electrosurgical system as recited in one of claims 38-43, wherein the independent power supply comprise a photovoltaic array.

45. The electrosurgical system as recited in one of claims 36-43, wherein the independent power source provides the negative voltage source and the positive voltage source.

46. A electrosurgical system for conveying electrosurgical power to tissue to achieve a predetermined electrosurgical effect, comprising:
a radio frequency (RF) power source;
a direct current (DC) current source;
a handle electrically coupled to the RF power source and; and
an electrosurgical blade coupled to the handle, the electrosurgical blade comprising:
an active electrode having a first section and a first tapered section terminating at a first conductor edge, the active electrode electrically coupled to the handle to receive RF power and negative DC current;
a first insulation layer having a second tapered section overlaying the active electrode which tapers on a side of the first tapered section to expose the first conductor edge;
a return electrode electrically isolated from the active electrode, the return electrode having a third section and a third taper section terminating at a second conductor edge, the return electrode electrically coupled to the handle to receive RF power and negative DC current;
a second insulation layer having a fourth tapered section overlaying the return electrode which tapers on a side of the third tapered section to expose the second conductor edge; and
a passive electrode electrically isolated from the active electrode and the return electrode, the passive electrode electrically coupled to the handle to receive positive DC current.

47. The electrosurgical system as recited in claim 46, further comprising an independent power source coupled to the RF power source, wherein the RF power source is configured to operate on power supplied by the independent power source.

48. The electrosurgical system as recited in claim 47, further comprising an inverter electrically coupled to the independent power source power source and the RF power source.

49. The electrosurgical system as recited in one of claims 46-48, wherein the RF power source is configured to operate on AC power provided by an external mains power source.

50. The electrosurgical system as recited in claim 49, wherein the independent power source and inverter are configured as a backup power supply to supply power to the electrosurgical system if the external mains power source fails.

51. The electrosurgical system as recited in one of claims 47-50, further comprising a rectifier configured to receive AC power from the external mains power source and charge the independent power source when external AC power is available.

52. The electrosurgical system as recited in one of claims 47-51, wherein the independent power supply comprises a battery.

53. The electrosurgical system as recited in one of claims 47-52, wherein the independent power supply comprise a fuel cell.

54. The electrosurgical system as recited in one of claims 47-53, wherein the independent power supply comprise a photovoltaic array.

55. The electrosurgical system as recited in one of claims 47-54, wherein the system is configured to be portable.

56. The electrosurgical system as recited in one of claims 47-55, wherein the DC current source is the independent power source.

57. The electrosurgical system as recited in one of claims 47-55, wherein the DC current source is positioned in the handle.

58. The electrosurgical system as recited in one of claims 47-55 and 57, wherein the DC current source is a rectifier circuit configured to receive RF power and output DC current.