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Electrosurgical apparatus with stable coagulation

  • US 6,436,096 B1
  • Filed: 11/24/1999
  • Issued: 08/20/2002
  • Est. Priority Date: 11/27/1998
  • Status: Expired due to Term
First Claim
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1. The electrosurgical apparatus for supplying high-frequency power from a high-frequency power supply unit to an instrument placed in association with an organic tissue to dissect or coagulate said organic tissue comprising:

  • an impedance calculating section for calculating an impedance value of said organic tissue before the instrument starts to coagulate or dissect said organic tissue; and

    a load characteristic alternating means which selects a load characteristic of an output in accordance with an initial impedance value of the organic tissue calculated by said impedance calculating section, wherein said load characteristic altering section selects a first load characteristic in which a load characteristic of an output has a peak at a predetermined impedance in a case where the initial impedance value of the organic tissue calculated by the impedance calculating section is above a designated threshold value, and selects a second load characteristic in which a load characteristic of an output has a peak at an impedance higher than that of the first load characteristic in a case where the initial impedance value of the organic tissue is under the predetermined threshold value.

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