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Electrosurgical instrument having needle cutting electrode and spot-coag electrode

  • US 5,007,908 A
  • Filed: 09/29/1989
  • Issued: 04/16/1991
  • Est. Priority Date: 09/29/1989
  • Status: Expired due to Term
First Claim
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1. An electrosurgical instrument comprising:

  • (a) an elongated tubular member having a proximal end, a distal end and plural lumens extending between said proximal and distal ends;

    (b) a bullet-shaped ceramic tip member affixed to said distal end of said tubular member, said tip member having a longitudinal bore formed therein, said bore exiting through an opening in the exterior of said tip member at a location displaced laterally from the longitudinal axis of said tubular member;

    (c) a first conductor disposed in one of said lumens;

    (d) means connected to said proximal end of said tubular member and joined to said first conductor for selectively displacing said first conductor whereby the distal end of said first conductor may be made to pass through said longitudinal bore and said opening;

    (e) a conductive surface adhered to said exterior of said ceramic tip member and surrounding but spaced from said opening; and

    (f) a second conductor passing through another of said plural lumens and electrically joined to said conductive surface.

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