Open vessel sealing forceps with disposable electrodes

• US 6,511,480 B1
• Filed: 10/22/1999
• Issued: 01/28/2003
• Est. Priority Date: 10/23/1998
• Status: Expired due to Term

• Current Assignee: Covidien AG (Medtronic Plc)
• Original Assignee: Sherwood Services AG
• Inventors: Lands, Michael J., Frazier, Randel A., Tetzlaff, Philip M., Dawes, Kate R., Lukianow, Steven W., Schmaltz, Dale F., Buysse, Steven P.
• Primary Examiner(s): Kearney, Rosiland S.
• Application Number:
  US09/425,696
• Time in Patent Office: 1,194 Days
• Field of Search: 606/41, 606/45, 606/48-52, 606/174, 606/205-208
• US Class Current: 606/51
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 18/1445 at the distal end of a shaft, e.g. forceps or scissors at the end of a rigid rod
• CPC Class Codes: A61B 2017/2945 Curved jaws
• CPC Class Codes: A61B 2018/00345 Vascular system
• CPC Class Codes: A61B 2018/00404 Blood vessels other than those in or around the heart
• CPC Class Codes: A61B 2018/00619 Welding
• CPC Class Codes: A61B 2018/0063 Sealing
• CPC Class Codes: A61B 2018/1432 curved
• CPC Class Codes: A61B 2018/1495 Electrodes being detachable from a support structure
• CPC Class Codes: A61B 2090/034 abutting on parts of the device itself

Abstract

A removable electrode assembly for use in combination with a forceps having opposing end effectors and a handle for effecting movement of the end effectors relative to one another. The electrode assembly includes a housing which is removably engageable with the forceps and a pair of electrodes which are attachable to a distal end of the housing. The electrodes are removably engageable with the end effectors of the forceps such that the electrodes reside in opposing relation relative to one another. The electrode assembly also includes a cover plate which is removably attachable to the housing and at least one stop member for controlling the distance the electrodes move relative to one another.

Claims

1. A removable electrode assembly for use with a forceps having opposing end effectors and a handle for effecting relative movement of the end effectors with respect to one another, the electrode assembly comprising:

a housing having at least one portion which is removably engageable with at least a portion of the forceps;

a pair of electrodes having opposing tissue sealing surfaces, said electrodes being removably engageable with the end effectors of the forceps such that the tissue sealing surfaces are disposed in opposing relation to one another, said electrodes being adapted for connection to a source of electrosurgical energy; and

at least one stop member for controlling the distance between the opposing tissue sealing surfaces such that upon electrosurgical activation, tissue held between the tissue sealing surfaces seals into a fused mass.

2. A removable electrode assembly according to claim 1 wherein each of the electrodes includes an electrically conductive sealing surface and an insulating substrate.

3. A removable electrode assembly according to claim 2 wherein the stop member is attached to the insulating substrate.

4. A removable electrode assembly according to claim 1 wherein the distal end of the housing is bifurcated forming two prongs and each of the electrodes is attached to one of the prongs.

5. A removable electrode assembly according to claim 4 wherein the prongs of the housing are movable relative to one another to facilitate engagement of the electrodes with the end effectors of the forceps.

6. A removable electrode assembly according to claim 5 wherein the insulating substrate of each of the electrodes includes at least one mechanical interface for engaging a complimentary mechanical interface disposed on the corresponding end effector of the forceps.

7. A removable electrode assembly according to claim 6 wherein the mechanical interface of at least one of the substrates includes at least one detent and the mechanical interface of the corresponding end effector includes at least one complimentary socket for receiving the detent.

8. A removable electrode assembly according to claim 6 wherein the substrate of at least one of the electrodes includes at least one guide pin and the corresponding end effector includes at least one complimentary aperture for receiving the guide pin.

9. A removable electrode assembly according to claim 1 wherein the stop member is attached to at least one of the end effectors.

10. A removable electrode assembly according to claim 1 wherein the stop member is attached to at least one of the electrodes.

11. A removable electrode assembly according to claim 1 wherein the electrodes are tapered.

12. A removable electrode assembly according to claim 1 wherein each of the electrodes includes an electrical connector for coupling to a wire.

13. A removable electrode assembly according to claim 1 wherein the housing is removably engageable with the handle of the forceps.

14. A removable electrode assembly according to claim 1 further comprising a cover plate which is removably engageable with the housing.

15. A removable electrode assembly according to claim 1 wherein the housing includes a bifurcated distal end which forms two prongs and each electrode is removably attachable to one of the prongs.

16. A removable electrode assembly according to claim 15 wherein the prongs of the housing are movable relative to one another to facilitate engagement of the electrodes with the end effectors of the forceps.

17. A removable electrode assembly according to claim 1 further comprising at least one ratchet which engages at least one complementary mechanical interface to maintain a desired closure force between opposing electrodes.

18. A removable electrode assembly according to claim 1 further comprising a pair of opposing ratchets which interlock in at least one position for maintaining a desired closure force between opposing electrodes.

19. A removable electrode assembly according to claim 1 wherein the stop member maintains a gap distance between opposing tissue sealing surfaces in the range of about 0.001 inches to about 0.006 inches.

20. A removable electrode assembly according to claim 16 wherein the gap distance is in the range of about 0.002 inches to about 0.005 inches.