Radio frequency ablation apparatus with remotely articulating and self-locking electrode wand

• US 6,423,059 B1
• Filed: 11/16/1999
• Issued: 07/23/2002
• Est. Priority Date: 11/16/1999
• Status: Expired due to Fees

• Current Assignee: Zimmer CEP USA Holding Co. (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Sulzer Medica USA, Inc. (Sulzer Medica)
• Inventors: Durfee, William K., Rizq, Raed N., Tahvildari, Samira, Balik, Jodi L., Sukhatankar, Mandar G., Erdman, Arthur G., Hanson, David A.
• Primary Examiner(s): Dvorak, Linda C. M.
• Assistant Examiner(s): Ruddy, David M.
• Application Number:
  US09/441,549
• Time in Patent Office: 980 Days
• Field of Search: 606/41, 606/46, 600/585, 600/131, 600/146, 600/147, 600/148, 600/149, 604/528
• US Class Current: 606/41
• CPC Class Codes: A61B 18/14 Probes or electrodes therefor
• CPC Class Codes: A61B 18/148 having a short, rigid shaft for accessing the inner body transcutaneously, e.g. for neurosurgery or arthroscopy
• CPC Class Codes: A61B 2017/003 Steerable
• CPC Class Codes: A61B 2018/00178 Electrical connectors
• CPC Class Codes: A61B 2018/00988 Means for storing information, e.g. calibration constants, or for preventing excessive use, e.g. usage, service life counter

Abstract

A radio frequency ablation apparatus having an application wand which is articulating and self-locking in a selected configuration. The wand has a handle having a thumb wheel apparatus. A threaded bore extends coaxially through the thumb wheel. A threaded tube received in the threaded bore translates a wire which extends to the distal end of the wand. At the distal end of the wand, the wire passes over a bendable section in the wand. Pushing or pulling the wire bends the distal tip through a range of angles on both sides of a neutral linear position. The distal tip remains self-locked in a selected position when the thumb screw is not turned.

Claims

1. A radio frequency ablation apparatus comprising:

a wand having a distal end and a proximal end;

an electrode adjacent said distal end of said wand;

a handle connected to said proximal end of said wand, and having a chamber inside said handle;

an electrical connector mounted on said handle and electrically connected to said electrode;

a wheel mounted in said handle, said wheel having a driving portion thereon, said wheel being contained within said chamber, and

a window opening into said chamber through said handle, said wheel being partially exposed through said window;

a threaded shaft connected to said driving portion and movable longitudinally thereby; and

a wire coupling said threaded shaft and said distal end of said wand.

2. The radio frequency ablation apparatus of claim 1 further comprising

a tube coupled a long an outer surface of said wand, said tube slidingly housing said wire.

3. The radio frequency ablation apparatus of claim 2 further comprising

a bendable section of said wand proximal to said distal end of said wand.

4. The radio frequency ablation apparatus of claim 3 wherein said tube extends immediately proximally of said bendable section and said wire extends distally of said bendable section.

5. The radio frequency ablation apparatus of claim 4 wherein said bendable section consists of a reduced part of said wand adjacent said wire.

6. The radio frequency ablation apparatus of claim 4 wherein said bendable section consists of an elastomeric segment.

7. The radio frequency ablation apparatus of claim 4 wherein said bendable section consists of a rotating joint.

8. The radio frequency ablation apparatus of claim 4 wherein said bendable section consists of a coiled spring.

9. The radio frequency ablation apparatus of claim 1 further comprising

a bearing coupled to said wheel, and

a bearing surface within said handle, said bearing surface supporting said bearing.

10. The radio frequency ablation apparatus of claim 9 wherein said bearing comprises a cylinder and said bearing surface comprises a cylindrical chamber, said cylinder being slidingly received in said cylindrical chamber.

11. The radio frequency ablation apparatus of claim 1 further comprising

a pin extending from said threaded shaft and slidingly received in a slot in said handle.

12. The radio frequency ablation apparatus of claim 1 further comprising a pivoting attachment connecting said wire to said distal end of said wand.

13. The radio frequency ablation apparatus of claim 1 wherein said driving portion comprises a threaded bore and said shaft is a threaded shaft is received in said bore.

14. The radio frequency ablation apparatus of claim 1 wherein said driving portion comprises a worm gear and said shaft is a threaded shaft coupled to said gear.

15. The radio frequency ablation apparatus of claim 1 wherein said driving portion comprises a pinion gear and said shaft is a rack coupled to said gear.

16. A medical catheter comprising:

a wand having a distal end and a proximal end;

a handle connected to said proximal end of said wand and having a chamber within said handle;

a wheel mounted within said chamber in said handle, said wheel having a driving portion thereon, and said handle having a window opening into said chamber through said handle, said wheel being partially exposed through said window; and

a stylet, said stylet having

a shaft connected to said driving portion; and

a wire coupling said shaft and said distal end of said wand.

17. The medical catheter of claim 16 further comprising

a tube coupled along an outer surface of said wand, said tube slidingly housing said wire.

18. The medical catheter of claim 17 further comprising

a bendable section of said wand proximal to said distal end of said wand.

19. The medical catheter of claim 18 wherein said tube extends immediately proximally of said bendable section and said wire extends distally of said bendable section.

20. The medical catheter of claim 19 wherein said bendable section consists of a reduced part of said wand adjacent said wire.

21. The medical catheter of claim 19 wherein said bendable section consists of an elastomeric segment.

22. The medical catheter of claim 19 wherein said bendable section consists of a rotating joint.

23. The medical catheter of claim 19 wherein said bendable section consists of a coiled spring.

24. The medical catheter of claim 16 further comprising

a bearing coupled to said wheel, and

a bearing surface within said handle, said bearing surface supporting said bearing.

25. The medical catheter of claim 24 wherein said bearing comprises a cylinder and said bearing surface comprises a cylindrical chamber, said cylinder being slidingly received in said cylindrical chamber.

26. The medical catheter of claim 16 further comprising

a pin extending from said stylet and slidingly received in a slot in said handle.

27. The medical catheter of claim 16 further comprising a pivoting attachment connecting said wire to said distal end of said wand.

28. The medical catheter of claim 16 wherein said driving portion comprises a threaded bore and said shaft is a threaded shaft is received in said bore.

29. The medical catheter of claim 16 wherein said driving portion comprises a worm gear and said shaft is a threaded shaft coupled to said gear.

30. The medical catheter of claim 16 wherein said driving portion comprises a pinion gear and said shaft is a rack coupled to said gear.

31. A radio frequency ablation apparatus comprising:

a radio frequency power source;

a wand having a distal end and a proximal end;

an electrode adjacent said distal end of said wand;

a handle connected to said proximal end of said wand, and having a chamber in said handle;

an electrical conductor electrically connecting said radio frequency power source to said electrode;

a wheel mounted in said handle, said wheel having a driving portion thereon, said wheel being contained within said chamber in said handle, and

a window opening into said chamber through said handle, said wheel being partially exposed through said window; and

a stylet, said stylet having

a shaft connected to said driving portion; and

a wire coupling said shaft and said distal end of said wand.

32. The radio frequency ablation apparatus of claim 31 further comprising a tube coupled along an outer surface of said wand, said tube slidingly housing said wire.

33. The radio frequency ablation apparatus of claim 32 further comprising a bendable section of said wand proximal to said distal end of said wand.

34. The radio frequency ablation apparatus of claim 33 wherein said tube extends immediately proximally of said bendable section and said wire extends distally of said bendable section.

35. The radio frequency ablation apparatus of claim 34 wherein said bendable section consists of a reduced part of said wand adjacent said wire.

36. The radio frequency ablation apparatus of claim 34 wherein said bendable section consists of an elastomeric segment.

37. The radio frequency ablation apparatus of claim 34 wherein said bendable section consists of a rotating joint.

38. The radio frequency ablation apparatus of claim 34 wherein said bendable section consists of a coiled spring.

39. The radio frequency ablation apparatus of claim 31 further comprising

a bearing coupled to said wheel, and

a bearing surface within said handle, said bearing surface supporting said bearing.

40. The radio frequency ablation apparatus of claim 39 wherein said bearing comprises a cylinder and said bearing surface comprises a cylindrical chamber, said cylinder being slidingly received in said cylindrical chamber.

41. The radio frequency ablation apparatus of claim 31 further comprising

a pin extending from said stylet and slidingly received in a slot in said handle.

42. The radio frequency ablation apparatus of claim 31 further comprising a pivoting attachment connecting said wire to said distal end of said wand.

43. The radio frequency ablation apparatus of claim 31 wherein said driving portion comprises a threaded bore and said shaft is a threaded shaft received in said bore.

44. The radio frequency ablation apparatus of claim 31 wherein said driving portion comprises a worm gear and said shaft is a threaded shaft coupled to said gear.

45. The radio frequency ablation apparatus of claim 31 wherein said driving portion comprises a pinion gear and said shaft is a rack coupled to said gear.