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Bipolar electrosurgical knife

  • US 4,202,337 A
  • Filed: 06/14/1977
  • Issued: 05/13/1980
  • Est. Priority Date: 06/14/1977
  • Status: Expired due to Term
First Claim
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1. An electrosurgical instrument of the type adapted to be selectively connected to a source of energy such as a high frequency electrical current for use in cutting, coagulating or otherwise treating human tissue or the like comprising an insulative handle and blade assembly mounted in said handle and extending therefrom, said blade assembly comprising an insulation member having an alumina composition of at least 96% purity, a linearly shaped active center electrode mounted to said insulation member, a plurality of return electrodes symmetrically mounted to said insulation member spaced apart from said center electrode and each other, a portion of said center electrode extending beyond said insulation member, said center electrode portion and sides of said insulation member forming a blade assembly having a beveled edge, means for connecting said electrodes to an energy source means so that an output circuit of a source of energy comprising a high frequency electrical current is completed through body tissue, said energy source means comprising means to selectively generate and conduct wave forms to said electrodes for performance of the desired electrical function.

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