Coagulation and dissection instrument with pin electrodes

Patent metadata

Field	Value
Publication number	US-11129668-B2
Application number	US-201815987627-A
Country	US
Kind code	B2
Filing date	May 23, 2018
Priority date	May 24, 2017
Publication date	Sep 28, 2021
Grant date	Sep 28, 2021

Abstract

The instrument comprises a jaw arrangement with two jaws that have, on their side facing the counter-electrode arrangement, rounded or flat electrode surfaces. The counter-electrode arrangement comprises at least one counter-electrode surface that may be rounded or flat. One of the electrode surfaces has a band edge preferably bordered by an insulator on one side, said band edge being adjacent to the adjacent electrode surface of the jaw arrangement. The counter-electrode surface has a band edge adjacent to the insulator facing the band edge of the one electrode surface. The band edges of the electrode surfaces acting as the coagulation surfaces are close enough such that they form cutting edges that develop a cutting effect with low voltages that are otherwise suitable only for coagulation. Accordingly, it is possible to provide fusion instruments that are extremely delicate, display lower thermal inertia and an excellent fusion and cutting effect.

First claim

The invention claimed is:

1. An instrument for the sealing and cutting of vessels, comprising:
a jaw arrangement including a first jaw having a first electrode surface and a second jaw having a second electrode surface, said first and second jaws being held at a distance from each other;
a counter-jaw arrangement including at least one counter-jaw;
wherein the first electrode surface of the first jaw and the second electrode surface of the second jaw are arranged in an asymmetric manner with respect to a longitudinally extending central plane that is parallel to a direction of movement of the respective first or second jaw or the counter-jaw and which extends through a cross-sectional center of the jaw and counter-jaw arrangements, and/or an electrode surface of the counter-jaw is arranged in an asymmetric manner with respect to the longitudinally extending central plane;
wherein the electrode surfaces of the second jaw and the at least one counter-jaw are configured to form a cutting gap therebetween for electrically cutting tissue disposed therein;
wherein the electrode surfaces of the first jaw and the at least one counter jaw are configured to form a coagulation gap therebetween for electrically sealing or coagulating tissue disposed therein;
wherein the second electrode surface of the second jaw of the jaw arrangement is electrically conductive and the second jaw includes an insulated section disposed on a side of the second jaw facing the first jaw;
wherein the electrically conductive electrode surface of the second jaw of the jaw arrangement has a current-concentrated edge adjacent the insulated section configured for cutting tissue disposed in the cutting gap between the current-concentrated edge and the electrode surface of the at least one counter-jaw;
wherein the first electrode surface of the first jaw is electrically conductive and is configured for sealing or coagulating tissue disposed in the coagulation gap between the first electrode surface and the electrode surface of the at least one-counter jaw.

2. The instrument according to claim 1 , wherein the electrode surface of the counter-jaw is electrically conductive and the counter-jaw includes an electrically insulated counter section disposed on a side facing away from the first jaw.

3. The instrument according to claim 1 , wherein the counter-jaw has a convexly curved surface facing the first and second jaws, and each of the first and second jaws has a convexly curved surface facing the counter-jaw, and wherein a distance between the first jaw and the second jaw is smaller than a diameter of the counter-jaw.

4. The instrument according to claim 1 , wherein the counter-jaw has a center located on the central plane and the first and second jaws of the jaw arrangement are arranged on different sides of the central plane at equal distances therefrom.

5. The instrument according to claim 1 , wherein the counter-jaw and the first and second jaws each have a cross-sectional surface area, and the cross-sectional surface area of the counter-jaw is at most as large as the sum of the cross-sectional surface areas of the first and second jaws.

6. The instrument according to claim 2 , wherein the electrically conductive electrode surface of the counter-jaw of the counter-jaw arrangement has a current-concentrating edge adjacent the insulated counter section.

7. The instrument according to claim 1 , wherein the first electrode surface and the second electrode surface are electrically connected to each other.

8. The instrument according to claim 1 , wherein the counter-jaw arrangement includes two counter-jaws that are held at a distance from each other.

9. The instrument according to claim 1 , wherein the first and second jaws of the jaw arrangement and the at least one counter-jaw of the counter-jaw arrangement are arranged so as to be laterally offset relative to each other.

10. The instrument according to claim 8 , wherein the counter-jaws have counter-electrode surfaces that are connected to each other.

11. The instrument according to claim 1 , wherein the electrode surfaces of the jaw arrangement are configured to be energized with different voltages with respect to one another.

12. The instrument according to claim 1 , wherein the counter-jaw arrangement comprises two counter-electrodes including the electrode surface of the counter-jaw that are configured to be energized with different voltages with respect to one another.

13. The instrument according to claim 1 , wherein the counter-jaw arrangement comprises two counter-electrode surfaces including the electrode surface of the counter-jaw that define, with the electrode surfaces of the first and second jaws, two coagulation gaps and one cutting gap.

14. The instrument according to claim 1 , wherein the first electrode surface extends along a side of the first jaw facing the second jaw and the first jaw lacks an insulated section disposed on the side of the first jaw facing the second jaw.

Assignees

• Erbe Elektromedizin

Inventors

• Nold Bernhard Tobias
• Weiler Rolf
• Selig Peter
• Fischer Klaus
• Blobel Lars

Classifications

• A61B18/14 Primary

  Probes or electrodes therefor · CPC title

• A61B18/12 Primary

  by passing a current through the tissue to be heated, e.g. high-frequency current · CPC title

• A61B2018/1467

  using more than two electrodes on a single probe · CPC title

• A61B2018/00607

  Coagulation and cutting with the same instrument · CPC title

• A61B2018/1405

  Electrodes having a specific shape · CPC title