Electrosurgical instrument end effector

• US 5,944,718 A
• Filed: 07/31/1997
• Issued: 08/31/1999
• Est. Priority Date: 03/12/1996
• Status: Expired due to Term

• Current Assignee: Ethicon Endo-Surgery, Inc. (Johnson & Johnson)
• Original Assignee: Ethicon Endo-Surgery, Inc. (Johnson & Johnson)
• Inventors: Dafforn, Kenneth R., McElhenney, Jay J., Austin, Charles E.
• Primary Examiner(s): Dvorak, Linda C. M.
• Assistant Examiner(s): Kearney, Rosiland
• Application Number:
  US08/903,832
• Time in Patent Office: 761 Days
• Field of Search: 606/32, 606/39, 606/40, 606/41, 606/45, 606/48, 606/49, 606/50, 606/51, 606/52, 606/205, 606/207
• US Class Current: 606/48
• 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 18/1815 using microwaves
• CPC Class Codes: A61B 2017/2929 with a head rotatable about the longitudinal axis of the shaft
• CPC Class Codes: A61B 2018/00404 Blood vessels other than those in or around the heart
• CPC Class Codes: A61B 2018/00601 Cutting
• CPC Class Codes: A61B 2018/00607 Coagulation and cutting with the same instrument
• CPC Class Codes: A61B 2018/126 bipolar
• CPC Class Codes: A61B 2018/146 Scissors

Abstract

A bipolar electrosurgical instrument comprising a handle, an end effector and an elongated hollow tube. The handle includes first and second grip members. The end effector includes first, second and third electrodes. The first electrode is substantially triangular in shape. The first electrode is adapted to pivot between an open position and a closed position. The first electrode also pivots around its proximal to distal axis and includes a coagulating surface and a cutting edge. The second and third electrodes are arranged substantially parallel to the first electrode when the first electrode is in the closed position. The elongated hollow tube includes a mechanism connecting the handle to the end effector such that movement of the first and second grip members relative to one another causes the first electrode to move relative to the second and third electrodes.

Claims

1. An end effector for use in an electrosurgical instrument, said end effector comprising:

a first electrode including a first axis wherein said first axis extends through a central portion of said first electrode from a proximal end of said first electrode to a distal end of said first electrode;

said first electrode rotatable around said first axis between a first position for performing a first function and a second position for performing a second function, said first electrode being adapted to pivot around a second axis wherein said first axis is substantially perpendicular to said second axis;

second and third electrodes wherein said second and third electrodes are electrically isolated from said first electrode, said second and third electrodes being arranged substantially perpendicular to said second axis, wherein said first electrode pivots around said second axis from an open position to a closed position such that said second and third electrodes are substantially parallel to said first axis when said first electrode is in said closed position.

2. An end effector according to claim 1 wherein said first electrode includes a first treatment surface which is substantially flat and a second treatment surface which is substantially pointed wherein said first and said second surfaces are substantially parallel to said first axis.

3. An end effector according to claim 2 wherein said first electrode has a shape which is substantially triangular in cross-section.

4. An end effector according to claim 3 wherein said first treatment surface is substantially convex.

5. An end effector according to claim 3 wherein said first treatment surface forms a first side of said triangle and said second treatment surface is positioned opposite said first surface at an interface between second and third sides of said triangle.

6. An end effector according to claim 5 wherein said second and third walls are concave in shape.

7. An end effector according to claim 6 wherein said first electrode is adapted to cut tissue positioned over said second and third electrodes when said first electrode is in said first position.

8. An end effector according to claim 6 wherein said first electrode is adapted to cauterize tissue positioned over said second and third electrodes when said first electrode is in said second position.

9. An end effector according to claim 1 wherein a proximal end of said first electrode is affixed to a pivot point and pivots about said second axis at the proximal end of said end effector.

10. An end effector according to claim 1 wherein said second and said third electrodes are connected together by a central region wherein said central region is insulated.

11. An end effector for use in an electrosurgical instrument, said end effector comprising:

a first axis extending substantially proximally to distally through said end effector;

first and second electrically isolated jaws wherein said first jaw is rotatable from a first treatment position to a second treatment position around a second axis, wherein said second axis extends through a central portion of said first jaw from a proximal end of said first jaw to a distal end of said first jaw and wherein said second axis is substantially parallel to said first axis when said end effector is in a closed position.