Diathermy coagulation and ablation apparatus and method

• US 5,395,363 A
• Filed: 06/29/1993
• Issued: 03/07/1995
• Est. Priority Date: 06/29/1993
• Status: Expired due to Term

• Current Assignee: Utah Medical Products Incorporated
• Original Assignee: Utah Medical Products Incorporated
• Inventors: Billings, R. Gail, Bush, David A., Cutler, Christopher A.
• Primary Examiner(s): Pellegrino, Stephen C.
• Assistant Examiner(s): PEFFLEY, MICHAEL F
• Application Number:
  US08/084,861
• Time in Patent Office: 616 Days
• Field of Search: 607/147-150, 607/115, 607/116, 606/41, 606/45, 606/48-50, 606/29, 128/642
• US Class Current: 606/41
• CPC Class Codes: A61B 18/1402 Probes for open surgery
• CPC Class Codes: A61B 2018/00107 Coatings on the energy applicator
• CPC Class Codes: A61B 2018/1253 monopolar
• CPC Class Codes: A61B 2018/126 bipolar
• CPC Class Codes: A61B 2018/1861 with an instrument inserted into a body lumen or cavity, e.g. a catheter

Abstract

An apparatus for facilitating diathermy coagulation or ablation of tissue by the application of an electrical current to tissue is connectable to an electrosurgical generator having an active lead and a return lead, and has both monopolar and bipolar embodiments. A preferred monopolar embodiment includes a shaft and a knurled active electrode rotatably secured to the shaft. A preferred bipolar embodiment includes a knurled active electrode separated by an insulator from a return electrode, with the active and return electrodes rotatably secured to a shaft by axles. The shafts may be Y-shaped, crook-shaped, or otherwise. The active electrodes have a plurality of discrete electrically conductive discharge points for applying the electrical current to a plurality of discrete tissue locations, the discharge points preferably being formed as knurl peaks. The active electrode may be formed of a stick-resistant metal, may be covered in part or whole by a nonstick coating, and may be formed in a variety of shapes and sizes.

Claims

1. An apparatus connectable to an electrosurgical generator for facilitating diathermy of tissue with a radio frequency electrical current from the electrosurgical generator, comprising:

a core having an exterior surface;

a plurality of discrete radio frequency electrically conductive discharge points for applying the radio frequency electrical current to a plurality of discrete tissue locations, said radio frequency electrically conductive discharge points disposed on protrusions on said exterior surface of said core, said protrusions comprising a plurality of knurls disposed on said exterior surface of said core, each of said knurls terminating in at least one of said radio frequency electrically conductive discharge points; and

a positioning means disposed adjacent to said core for positioning said radio frequency electrically conductive discharge points relative to the tissue to facilitate diathermy, said positioning means comprising an active lead which is electrically connected to said radio frequency electrically conductive discharge points and which is electrically connectable to the electrosurgical generator.

2. The apparatus of claim 1, wherein at least a portion of said exterior surface of said core is substantially ovoid in shape.

3. The apparatus of claim 1, wherein at least a portion of said exterior surface of said core is substantially cylindrical in shape.

4. The apparatus of claim 1, wherein said core is rotatably secured to said positioning means such that successive pluralities of said radio frequency electrically conductive discharge points rotate into electrical contact with the tissue if an initial plurality of said radio frequency electrically conductive discharge points is placed in frictional engagement with the tissue and said positioning means is manipulated to roll said core along the tissue.

5. The apparatus of claim 1, wherein said core is rotatably secured to said positioning means, and said apparatus further comprises an insulating layer that covers at least a portion of said exterior surface of said core, said insulating layer having perforations aligned with at least a portion of said radio frequency electrically conductive discharge points.

6. The apparatus of claim 1, wherein said radio frequency electrically conductive discharge points comprise a metallic material substantially resistant to sticking to the tissue during diathermy.

7. The apparatus of claim 1, wherein at least a portion of said positioning means is electrically insulated from said radio frequency electrically conductive discharge points, such that a physician may manipulate said positioning means by hand.

8. The apparatus of claim 1, wherein said positioning means comprises:

a shaft having a longitudinal axis; and

an axle connected to said shaft and angled away from the longitudinal axis of said shaft, said core being rotatably secured upon said axle.

9. The apparatus of claim 8, wherein said axle is connected to a crook-shaped portion of said shaft.

10. The apparatus of claim 8, wherein said axle is connected to a Y-shaped portion of said shaft.

11. The apparatus of claim 8, wherein said axle is disposed substantially transverse to the longitudinal axis of said shaft.

12. The apparatus of claim 8, wherein at least a portion of said axle is electrically conductive and is disposed electrically between the electrosurgical generator and said radio frequency electrically conductive discharge points, for conducting radio frequency electrical current from the electrosurgical generator to said radio frequency electrically conductive discharge points.

13. The apparatus of claim 1, further comprising a nonstick coating that covers at least a portion of said exterior surface of said core.

14. The apparatus of claim 13, wherein said nonstick coating comprises polytetrafluoroethylene.

15. The apparatus of claim 13, wherein said nonstick coating decreases in thickness near said radio frequency electrically conductive discharge points.

16. The apparatus of claim 1, wherein said core further comprises an insulator and an electrically conductive reception member for receiving and returning to the electrosurgical generator at least a portion of the radio frequency electrical current discharged from said radio frequency electrically conductive discharge points, said insulator being disposed between said radio frequency electrically conductive discharge points and said electrically conductive reception point, and said electrically conductive reception point being electrically connected to the electrosurgical generator.

17. An apparatus connectable to an electrosurgical generator for facilitating coagulation and ablation of tissue by the application of a radio frequency electrical current from the electrosurgical generator to the tissue, comprising:

a shaft having a longitudinal axis and comprising an active lead which is electrically connectable to the electrosurgical generator;

an axle connected to said shaft and angled away from the longitudinal axis of said shaft;

a core having an exterior surface, said core rotatably secured to said axle; and

a plurality of discrete radio frequency electrically conductive discharge points for applying the radio frequency electrical current to a plurality of discrete tissue locations, said radio frequency electrically conductive discharge points disposed on protrusions on said exterior surface of said core and electrically connected to said active lead for connection to the electrosurgical generator.

18. The apparatus of claim 17, wherein said protrusions comprise a plurality of knurls disposed on said exterior surface of said core, each of said knurls terminating in at least one of said radio frequency electrically conductive discharge points.

19. The apparatus of claim 17, further comprising a nonstick coating that covers at least a portion of said exterior surface of said core.

20. A bipolar apparatus connectable to an electrosurgical generator having an active lead and a return lead, the bipolar apparatus for facilitating diathermy by the application to tissue of a radio frequency electrical current emanating from the active lead of the electrosurgical generator, the bipolar apparatus comprising:

a core having an exterior surface, comprising;

a plurality of discrete radio frequency electrically conductive discharge points for applying the radio frequency electrical current to a plurality of discrete tissue locations, said radio frequency electrically conductive discharge points disposed on protrusions on said exterior surface and electrically connectable to the active lead of the electrosurgical generator;

an electrically conductive reception member for receiving and returning at least a portion of the radio frequency electrical current discharged from said radio frequency electrically conductive discharge points, said electrically conductive reception member disposed on said exterior surface and electrically connected to the return lead; and

an insulator disposed between and electrically insulating said radio frequency electrically conductive discharge points from said electrically conductive reception member; and

a positioning means disposed adjacent to said core, for positioning said exterior surface of said core relative to the tissue, said positioning means comprising a positioning means active lead which is electrically connected to said radio frequency electrically conductive discharge points and which is electrically connectable to the active lead of the electrosurgical generator, said core being rotatably secured to said positioning means such that successive pluralities of said radio frequency electrically conductive discharge points rotate into electrical contact with the tissue if an initial plurality of said radio frequency electrically conductive discharge points is placed in frictional engagement with the tissue and said positioning means is manipulated to roll said core along the tissue.

21. The bipolar apparatus of claim 20, wherein said positioning means comprises:

a shaft having a longitudinal axis; and

an axle connected to said shaft and angled away from the longitudinal axis of said shaft, said core being rotatably secured upon said axle.

22. The bipolar apparatus of claim 20, wherein said protrusions comprise a plurality of knurls disposed on said exterior surface of said core, each of said knurls terminating in at least one of said radio frequency electrically conductive discharge points.

23. The bipolar apparatus of claim 20, wherein said electrically conductive reception member comprises a plurality of discrete electrically conductive reception points, for receiving radio frequency electrical current from a plurality of discrete tissue locations and returning the radio frequency electrical current to the return lead.

24. The bipolar apparatus of claim 20, further comprising a nonstick coating that covers at least a portion of said exterior surface of said core.

25. A bipolar apparatus connectable to an electrosurgical generator having an active lead and a return lead, the bipolar apparatus for facilitating coagulation or ablation of tissue by the application to tissue of a radio frequency electrical current emanating from the active lead of the electrosurgical generator, the bipolar apparatus comprising:

a shaft having a longitudinal axis;

an axle connected to said shaft and angled away from the longitudinal axis of said shaft;

a core having an exterior surface, said core rotatably secured to said axle, said core comprising;

a plurality of discrete radio frequency electrically conductive discharge points for applying the radio frequency electrical current to a plurality of discrete tissue locations, said radio frequency electrically conductive discharge points disposed on protrusions on said exterior surface and electrically connected to the active lead;

an electrically conductive reception member for receiving and returning at least a portion of the radio frequency electrical current discharged from said radio frequency electrically conductive discharge points, said electrically conductive reception member disposed on said exterior surface and electrically connected to the return lead; and

an insulator disposed between said radio frequency electrically conductive discharge points and said electrically conductive reception member.

26. An apparatus connectable to an electrosurgical generator for facilitating diathermy of tissue with a radio frequency electrical current from the electrosurgical generator, comprising:

a core having an exterior surface;

a plurality of discrete radio frequency electrically conductive discharge points for applying the radio frequency electrical current to a plurality of discrete tissue locations, said radio frequency electrically conductive discharge points disposed on protrusions on said exterior surface of said core; and

a positioning means disposed adjacent to said core for positioning said radio frequency electrically conductive discharge points relative to the tissue to facilitate diathermy, said positioning means comprising an active lead which is electrically connected to said radio frequency electrically conductive discharge points and which is electrically connectable to the electrosurgical generator, said core being rotatably secured to said positioning means such that successive pluralities of said radio frequency electrically conductive discharge points rotate into electrical contact with the tissue if an initial plurality of said radio frequency electrically conductive discharge points is placed in frictional engagement with the tissue and said positioning means is manipulated to roll said core along the tissue.

27. An apparatus connectable to an electrosurgical generator for facilitating diathermy of tissue with a radio frequency electrical current from the electrosurgical generator, comprising:

a core having an exterior surface;

a plurality of discrete radio frequency electrically conductive discharge points for applying the radio frequency electrical current to a plurality of discrete tissue locations, said radio frequency electrically conductive discharge points disposed on protrusions on said exterior surface of said core;

a positioning means disposed adjacent to said core for positioning said radio frequency electrically conductive discharge points relative to the tissue to facilitate diathermy, said positioning means comprising an active lead which is electrically connected to said radio frequency electrically conductive discharge points and which is electrically connectable to the electrosurgical generator, said core being rotatably secured to said positioning means; and

an insulating layer that covers at least a portion of said exterior surface of said core, said insulating layer having perforations aligned with at least a portion of said radio frequency electrically conductive discharge points.

28. An apparatus connectable to an electrosurgical generator for facilitating diathermy of tissue with a radio frequency electrical current from the electrosurgical generator, comprising:

a core having an exterior surface;

a plurality of discrete radio frequency electrically conductive discharge points for applying the radio frequency electrical current to a plurality of discrete tissue locations, said radio frequency electrically conductive discharge points disposed on protrusions on said exterior surface of said core; and

a positioning means disposed adjacent to said core for positioning said radio frequency electrically conductive discharge points relative to the tissue to facilitate diathermy, said positioning means comprising an active lead which is electrically connected to said radio frequency electrically conductive discharge points and which is electrically connectable to the electrosurgical generator, said positioning means comprising;

a shaft having a longitudinal axis; and

an axle connected to said shaft and angled away from the longitudinal axis of said shaft, said core being rotatably secured upon said axle.

29. A bipolar apparatus connectable to an electrosurgical generator having an active lead and a return lead, the bipolar apparatus for facilitating diathermy by the application to tissue of a radio frequency electrical current emanating from the active lead of the electrosurgical generator, the bipolar apparatus comprising:

a core having an exterior surface, comprising;

a plurality of discrete radio frequency electrically conductive discharge points for applying the radio frequency electrical current to a plurality of discrete tissue locations, said radio frequency electrically conductive discharge points disposed on protrusions on said exterior surface and electrically connectable to the active lead of the electrosurgical generator;

an electrically conductive reception member for receiving and returning at least a portion of the radio frequency electrical current discharged from said radio frequency electrically conductive discharge points, said electrically conductive reception member disposed on said exterior surface and electrically connected to the return lead; and

an insulator disposed between and electrically insulating said radio frequency electrically conductive discharge points from said electrically conductive reception member; and

a positioning means disposed adjacent to said core, for positioning said exterior surface of said core relative to the tissue, said positioning means comprising a positioning means active lead which is electrically connected to said radio frequency electrically conductive discharge points and which is electrically connectable to the active lead of the electrosurgical generator, said positioning means comprising;

a shaft having a longitudinal axis; and

an axle connected to said shaft and angled away from the longitudinal axis of said shaft, said core being rotatably secured upon said axle.