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Electrosurgical instrument

  • US 4,074,718 A
  • Filed: 03/17/1976
  • Issued: 02/21/1978
  • Est. Priority Date: 03/17/1976
  • Status: Expired due to Term
First Claim
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1. An electrosurgical instrument comprisinga support member;

  • at least one electrode mounted on said support member, said electrode comprising (a) a substrate consisting essentially of a material having a figure of merit of at least 0.15 at room temperature where said figure of merit is the product of the thermal conductivity, the heat capacity and the density of said material in the metric system, and (b) an electrically resistive coating disposed on said substrate, the volume resistivity of said coating extending from about 10-4 to 108 Ω

    -cm.ridged heat radiating means in thermal contact with said electrode for radiating heat into the medium surrounding said electrode, said heat radiating means being covered by a ridged electrically insulative cover andmeans for connecting said electrode to a source of electrosurgical energy.

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