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Coaxial electrosurgical instrument

  • US 5,556,397 A
  • Filed: 10/26/1994
  • Issued: 09/17/1996
  • Est. Priority Date: 10/26/1994
  • Status: Expired due to Fees
First Claim
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1. A coaxial electrosurgical instrument for performing surgical procedures on tissue, comprising:

  • an elongate, tubular, outer electrode covered with an insulating sleeve which leaves a distal end portion of the outer electrode uninsulated;

    an elongate, inner electrode, located coaxially within the outer electrode and electrically insulated therefrom such that a distal uninsulated end portion of the inner electrode extends to a predetermined length from the distal uninsulated end portion of the outer electrode to enable simultaneous electrical contact by the distal uninsulated end portions of both the inner and outer electrodes with the tissue to be operated on; and

    means for providing an alternating electrical voltage difference at a controlled frequency between the inner and outer electrodes;

    wherein the distal end portion of the outer electrode has a transverse end surface inclined at an acute first angle relative to a common axis of the inner and outer electrodes.

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