Electrosurgical system providing a fulguration current

• US 3,952,748 A
• Filed: 07/18/1974
• Issued: 04/27/1976
• Est. Priority Date: 07/18/1974
• Status: Expired due to Term

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Kaliher, Paul L., Roos, Bryan K., Nelson, Fred W.
• Primary Examiner(s): Michell, Robert W.
• Assistant Examiner(s): Cohen, Lee S.
• Application Number:
  US05/489,519
• Time in Patent Office: 649 Days
• Field of Search: 128/303.14, 128/303.17, 128/303.13, 128/303.18, 307/112, 323/45
• US Class Current: 606/37
• CPC Class Codes: A61B 18/12 by passing a current through the tissue to be heated, e.g. high-frequency current
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 2018/0066 without feedback, i.e. open loop control
• CPC Class Codes: Y10S 323/911 Medical electronics

Abstract

An electrosurgical system, having a solid state generator for providing a cut mode electrosurgical current waveform of RF electric energy having a first voltage amplitude to an active electrode terminal, is adapted by the addition of an apparatus for alternatively providing a fulguration mode current waveform having a second higher voltage amplitude from the generator to the active electrode terminal. A fulguration adaptor including a transformer for enabling the generator to provide a fulguration mode waveform having said second higher voltage amplitude; switching apparatus connected to the transformer for selectively connecting the transformer to the generator for providing said fulguration mode waveform, for disconnecting the transformer from the generator, and for switching off the current from the generator when operated to disconnect the transformer; and a delay circuit connected to the switching apparatus for delaying said disconnection of the transformer until after the current from the generator has been switched off.

Claims

1. A fulguration adaptor for enabling an electrosurgical system including a solid state generator for providing a cut mode electrosurgical current waveform of RF electric energy having a first voltage amplitude to an active electrode terminal to which an electrosurgical instrument is connected during use of the system, to alternatively provide a fulguration mode current waveform from the generator to the active electrode terminal,

said adaptor comprising

transformer means for enabling the generator to provide a fulguration mode waveform having a second higher voltage amplitude;

switching means connected to the transformer means for selectively connecting the transformer means to the generator for providing said fulguration mode waveform, for disconnecting the transformer means from the generator, and for switching off the current from the generator when operated to disconnect the transformer means; and

delay circuit means connected to the switching means for delaying said disconnection of the transformer means until after the current from the generator has been switched off.

2. An electrosurgical system having a solid state generator for providing a first voltage amplitude cut mode electrosurgical current waveform of RF electric energy to an active electrode terminal to which an electrosurgical instrument is connected during use of the system,

the improvement comprising means for alternatively providing a fulguration mode current waveform from the generator to the active electrode terminal, which means includes:

transformer means for enabling the generator to provide a fulguration mode waveform having a second higher voltage amplitude;

switching means connected to the transformer means for selectively connecting the transformer means to the generator for providing said fulguration mode waveform, for disconnecting the transformer means from the generator, and for switching off the current from the generator when operated to disconnect the transformer means; and

delay circuit means connected to the switching means for delaying said disconnection of the transformer means until after the current from the generator has been switched off.

3. An electrosurgical system having a solid state generator for providing cut mode and coagulation mode electrosurgical current waveforms of RF electric energy having a relatively low voltage amplitude to an active electrode terminal to which an electrosurgical instrument is connected during use of said system,

the improvement comprising

means for alternatively providing a fulguration mode current waveform from the generator to the active electrode terminal,

said fulguration mode providing means including

transformer means for changing the coagulation mode waveform to provide a fulguration mode waveform having a second higher voltage amplitude;

switching means connected to the transformer means for selectively connecting the transformer means to the generator for providing said fulguration mode waveform, for disconnecting the transformer means from the generator, and for switching off the current from the generator when operated to disconnect the transformer means; and

delay circuit means connected to the switching means for delaying said disconnection of the transformer means until after the current from the generator has been switched off.