Electro surgical high frequency cutting instrument

• US 4,706,667 A
• Filed: 07/28/1986
• Issued: 11/17/1987
• Est. Priority Date: 06/25/1984
• Status: Expired due to Term

• Current Assignee: Berchtold Medizin-Elektronik GmbH & Company
• Original Assignee: Berchtold Medizin-Elektronik GmbH & Company
• Inventors: Roos, Eberhard
• Primary Examiner(s): Kamm, William E.
• Assistant Examiner(s): Hindenburg, Max F.
• Application Number:
  US06/892,883
• Time in Patent Office: 477 Days
• Field of Search: 128/303.1, 128/303.13-303.17
• US Class Current: 606/48
• CPC Class Codes: A61B 18/14 Probes or electrodes therefor
• CPC Class Codes: A61B 18/1402 Probes for open surgery
• CPC Class Codes: A61B 2018/00577 Ablation
• CPC Class Codes: A61B 2018/00928 by sending a signal to an external energy source
• CPC Class Codes: A61B 2018/126 bipolar
• CPC Class Codes: A61B 2018/162 located on the probe body
• CPC Class Codes: A61B 2090/062 penetration depth

Abstract

In an electro-surgical r.f. cutting instrument in which the neutral electrode (11) is arranged on both sides of the cutting electrode (12) but is however set back relative to the cutting electrode (12) on the instrument body (13). The ratio of the sizes of the contact areas (14, 15) of the neutral electrode (11) and of the cutting electrode (12) is greater than 7:1 and smaller than 20:1.

Claims

1. An electro-surgical apparatus for connecting to first and second outputs of an electrical generator comprising:

a first electrode comprising first and second generally elongate members, the members being spaced apart at one end and being displaceable relative to each other at the other end;

a second electrode disposed between the first and second members of the first electrode and beign generally parallel thereto;

means for displacing the second electrode relative to the first electrode;

means for connecting the first output of the electrical generator to the first and second members of the first electrode and for connecting the second output of the electrical generator to the second electrode when the second electrode is displaced to a first position relative to the first electrode; and

means for alternately connecting the first output of the electrical generator to the first member of the first electrode and for connecting the second output of the electrical generator to the second member of the first electrode when the second electrode is displaced to a second position relative to the first electrode.

2. The apparatus according to claim 1 further comprising:

means for electrically insulating the members of the first electrode from each other; and

means for connecting the first output of the electrical generator to the first member of the first electrode and for connecting the second output of the electrical generator to the second member of the first electrode.

3. The apparatus according to claim 1 further comprising:

means for applying a first voltage to the first and second electrodes when the second electrode is displaced to the first position relative to the first electrode; and

means for applying a second voltage to the first and second members of the first electrode when the second electrode is displaced to the second position relative to the first electrode.