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Power control technique for beam-type electrosurgical unit

  • US RE34,432 E
  • Filed: 02/19/1992
  • Issued: 11/02/1993
  • Est. Priority Date: 04/08/1986
  • Status: Expired due to Term
First Claim
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1. In an electrosurgical unit which includes means for conducting a predetermined gas in a jet to tissue and means for transferring electrical energy in ionized conductive pathways in the gas jet, said electrical energy transferring means operatively transferring arcs to the tissue in the ionized conductive pathways in an active state to thereby create a predetermined electrosurgical effect on the tissue, said electrical energy transferring means operatively creating substantially only ionized conductive pathways in the gas jet in an inactive state to allow arc initiation upon transition to the active state, said electrical energy transferring means including electrosurgical generator means for generating target bursts of radio frequency electrical energy at a predetermined inactive repetition rate in the inactive state and for generating active bursts of radio frequency electrical energy at a predetermined active repetition rate in the active state, said electrical energy transferring means applying the bursts of radio frequency energy to the gas jet, and an improvement to said electrosurgical generator means comprising, in combination:

  • repetition rate changing means for changing the predetermined repetition rate of the target bursts to a value substantially less than the predetermined repetition rate of the active bursts.

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