Electrosurgical needle electrode

• US 7,867,226 B2
• Filed: 06/29/2006
• Issued: 01/11/2011
• Est. Priority Date: 06/30/2005
• Status: Active Grant

• Current Assignee: Microline Surgical, Inc. (Hoya Corporation)
• Original Assignee: Microline Surgical, Inc. (Hoya Corporation)
• Inventors: Heim, Warren P., Brassell, James L.
• Primary Examiner(s): Peffley; Michael
• Assistant Examiner(s): Good; Samantha
• Application Number:
  US11/427,702
• Publication Number:
  US 20070005059A1
• Time in Patent Office: 1,657 Days
• Field of Search: 606/41, 606/45
• US Class Current: 606/41
• CPC Class Codes: A61B 18/1402 Probes for open surgery
• CPC Class Codes: A61B 2018/00083 low, i.e. electrically insulating
• CPC Class Codes: A61B 2018/00101 low, i.e. thermally insulating

Abstract

An electrosurgical needle includes a body having at least one conductive element in the form of a needle that is surrounded by an insulation layer except at a conductor tip portion of the conductive element. The conductor tip portion and insulation layer each have unique geometric shapes and composition of the parts to reduce or eliminate the production of smoke and eschar and reduce tissue damage. The electrosurgical needle electrode is configured to concentrate the flow of electrosurgical energy at the tip region.

Claims

1. An electrosurgical needle for conveying electrosurgical power to tissue to achieve a predetermined electrosurgical effect, comprising:

an electrically conductive needle element having a first section and a first tapered section tapering towards and terminating at a distalmost conductor tip; and

an insulation layer having a second tapered section generally following the contours of and overlaying the conductive needle element and at least a portion of the first tapered section such that the distalmost conductor tip is exposed while the insulation layer overlays the remainder of the electrically conductive needle element.

2. The electrosurgical needle as recited in claim 1, wherein the needle is configured to be disposable.

3. The electrosurgical needle as recited in claim 1, wherein the insulation layer covers the first tapered section except to expose the conductor tip forming a primary reaction region.

4. The electrosurgical needle as recited in claim 1, wherein the thickness of the conductor tip is less than that of the first section.

5. The electro surgical needle as recited in claim 3, wherein the conductor tip is flush with the insulating layer within the primary reaction region.

6. The electrosurgical needle as recited in claim 5, wherein the first tapered section includes at least one beveled surface.

7. The electrosurgical needle as recited in claim 5, wherein the first tapered section includes two beveled surfaces.

8. The electrosurgical needle as recited in claim 5, wherein at least a portion of the first tapered section comprises at least three beveled surfaces.

9. The electrosurgical needle as recited in claim 5, wherein at least a portion of the first tapered section comprises at least four beveled surfaces.

10. The electrosurgical needle as recited in claim 5, wherein at least a portion of the first tapered section is approximately circumferentially beveled.

11. The electrosurgical needle as recited in claim 5, wherein at least a portion of the first tapered section has a concave shape.

12. The electrosurgical needle as recited in claim 6, wherein at least a portion of the second tapered section has a concave shape overlaying the beveled surface.

13. The electrosurgical needle as recited in claim 9, wherein at least a portion of the second tapered section has a concave shape overlaying the four beveled surfaces.

14. The electrosurgical needle as recited in claim 10 wherein at least a portion of the second tapered section has a circumferentially concave shape overlaying the beveled surface.

15. The electrosurgical needle as recited in claim 6, wherein at least a portion of the second tapered section insulation layer has a linear taper shape overlaying the beveled surface.

16. The electrosurgical needle as recited in claim 9, wherein at least a portion of the second tapered section has a linear taper shape overlaying the four beveled surfaces.

17. The electrosurgical needle as recited in claim 10 wherein at least a portion of the second tapered section has a circumferentially linear shape overlaying the beveled surface.

18. The electrosurgical needle as recited in claim 5, wherein at least a portion of the second tapered section insulation layer has a convex taper shape overlaying the beveled surface.

19. The electrosurgical needle as recited in claim 9, wherein at least a portion of the second tapered section has a convex taper shape overlaying the four beveled surfaces.

20. The electrosurgical needle as recited in claim 10 wherein at least a portion of the second tapered section has a circumferentially convex shape overlaying the beveled surface.

21. The electrosurgical needle as recited in claim 14, wherein a tangent to the insulation at at least a portion of the conductor tip forms an angle with a centerline of the needle is less than about 60 degrees.

22. The electrosurgical needle as recited in claim 14, wherein a tangent to the insulation at at least a portion of the conductor tip forms an angle with a centerline of the needle is less than about 45 degrees.

23. The electrosurgical needle as recited in claim 14, wherein a tangent to the insulation at at least a portion of the conductor tip forms an angle with a centerline of the needle is less than about 20 degrees.

24. The electrosurgical needle as recited in claim 1, wherein the conductor tip has a thermal conductivity characteristic of at least 0.0002 W/°

K.

25. The electrosurgical needle as recited in claim 4, wherein at least a portion of the conductor tip has a transverse cross section that forms an acute angle.

26. The electrosurgical needle as recited in claim 4 wherein at least a portion of the conductor tip has a thickness less than about 0.005 inches.

27. The electrosurgical needle as recited in claim 4, wherein at least a portion of the conductor tip has a thickness less than about 0.002 inches.

28. The electrosurgical needle as recited in claim 4, wherein at least a portion of the conductor tip has a thickness less than about 0.0005 inches.

29. The electrosurgical needle as recited in claim 3, wherein at least a portion of the thickness of the insulation layer within the primary reaction region is at least one half the thickness of the conductor tip.

30. The electrosurgical needle as recited in claim 3, wherein at least a portion of the thickness of the insulation layer within the primary reaction region is at least as thick as the conductor tip.

31. The electrosurgical needle as recited in claim 4 wherein the ratio of width of a first section to the conductor tip is at least 5:

1.

32. The electrosurgical needle as recited in claim 4 wherein the ratio of width of a first section to the conductor tip is 20:

1.

33. The electrosurgical needle as recited in claim 1, wherein at least a portion of cross section of the first section is circular.

34. The electrosurgical needle as recited in claim 1 wherein at least a portion of cross section of the first section is a polygon.

35. The electrosurgical needle as recited in claim 5, wherein at least a portion of each side of the first tapered section extends radially inward and proximately intersects with one another at the conductor tip.

36. The electrosurgical needle as recited in claim 5, wherein at least a portion of each side of the first tapered section extends linearly inward and proximately intersect with one another at the conductor tip.

37. The electrosurgical needle as recited in claim 5, wherein at least a portion of each side of the second tapered section extends radially inward and proximately intersects with one another at the conductor tip.

38. The electrosurgical needle as recited in claim 5, wherein at least a portion of each side of the second tapered section extends linearly inward and proximately intersect with one another at the conductor tip.

39. The electrosurgical needle as recited in claim 5, wherein at least a portion of each side of the second tapered section extends radially outward and proximately intersect with one another at the conductor tip.

40. The electrosurgical needle as recited in claim 5 wherein a tangent to the insulation at the conductor tip forms an angle with a centerline of the needle of less than about 45 degrees.

41. The electrosurgical needle as recited in claim 5, wherein a tangent to the insulation at the conductor tip forms an angle with a centerline of the needle of less than about 20 degrees.

42. The electrosurgical needle as recited in claim 1, further comprising a connector disposed on the needle proximal from the conductor tip configured for electrically connecting the needle to a holder.

43. A sterile package kit for use in performing an electrosurgical

a sterile package;

and

a disposable electrosurgical needle sealed within the sterile package, the disposable electrosurgical needle comprising;

an electrically conductive needle element having a first section and a first tapered section terminating at a distalmost conductor tip, and

an insulation layer having a second tapered section overlaying the conductive needle element which tapers on all sides of the first tapered section to expose the distalmost conductor tip forming a primary reaction region while the insulation layer overlays the remainder of the electrically conductive needle element.

44. The sterile package kit according to claim 43, further comprising:

a handle sealed within the sterile package and configured to be coupled to the electrically conductive element; and

an electrical connector coupled to the handle and configured to electrically couple the disposable electrosurgical needle to a radio frequency power source.

45. The sterile package kit according to claim 43, further comprising printed instructions informing a user how to securely couple the disposable electrosurgical needle to the radio frequency power source.