Electrosurgical apparatus with stable coagulation
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United States of America Patent
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Jan 28, 2003
Grant Date -
Mar 14, 2002
app pub date -
Nov 14, 2001
filing date -
Nov 27, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
An electrosurgical apparatus supplies high-frequency power from a high-frequency power supply unit to an instrument placed in association with an organic tissue to dissect or coagulate the organic tissue. An impedance calculating section calculates the impedance value of the organic tissue. A rate-of-impedance-change calculating section calculates the rate of impedance change of the organic tissue based on the impedance value calculated by the impedance calculating section. A control section controls the high-frequency output of the high-frequency power supply unit based on a predetermined condition provided by combining the impedance value calculated by the impedance calculating section with the rate of impedance change calculated by the rate-of-impedance-change calculating section.
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