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Electrosurgical trocar assembly with bi-polar electrode

  • US 5,300,070 A
  • Filed: 06/19/1992
  • Issued: 04/05/1994
  • Est. Priority Date: 03/17/1992
  • Status: Expired due to Term
First Claim
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1. An electrosurgical system comprising a radio frequency power source, an electrosurgical trocar device connected to said power source and including a cutting element having a cutting tip and a cut-off circuit for sensing the load impedance at the cutting tip of said trocar device and for interrupting the connection between the trocar device and the power source responsive to a change in said load impedance, said cutting element being connected to said power source through a current carrying conductor of a scale presenting a leakage impedance at the operating frequencies of said power source and said system further including means for counteracting the effect of the leakage impedance presented by the cable so that the load impedance sensed by said cut-off circuit is substantially free of the effect of said leakage impedance.

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