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Silicon nitride electrosurgical blade

  • US 4,850,353 A
  • Filed: 08/08/1988
  • Issued: 07/25/1989
  • Est. Priority Date: 08/08/1988
  • Status: Expired due to Fees
First Claim
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1. A blade for an electrosurgical scalpel comprising:

  • (a) a relatively thin, silicon nitride ceramic substrate having a working portion and a handle engaging portion, said working portion having a beveled working edge, an unbeveled opposed edge and a blunt beveled tip extending between said working edge and said opposed edge;

    (b) first and second refractory metal conductive strips adhered to and extending parallel to said working edge on opposed side surfaces of said silicon nitride ceramic substrate so as to be spaced from one another by the thickness of said substrate at said beveled working edge in said working portion and extending substantially across said handle receiving portion; and

    (c) a third refractory metal conductive strip adhered to and extending parallel to said unbeveled opposed edge on at least one side surface of said silicon nitride ceramic substrate so as to be spaced a relatively large distance from the first conductive strip, said third conductive strip extending substantially across said handle receiving portion.

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