Electrosurgery system and instrument
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United States of America Patent
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Apr 15, 2003
Issued Date -
N/A
app pub date -
May 18, 2000
filing date -
May 21, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an electrosurgery system having a radio frequency generator and an instrument with a treatment electrode, the generator includes a circuit for sensing thermionic emission from the electrode as means of controlling the supply of radio frequency power to the electrode. Thermionic emission is sensed by detecting d.c. voltage at the output of the generator, or an a.c. representation of the d.c. voltage, using a detector with an isolated output, and generator output power is controlled so as to limit the d.c. voltage or the a.c. representation to a predetermined threshold. Accordingly, the temperature of the electrode can be limited to avoid electrode destruction. The invention also has application to reducing nerve stimulation due to electrosurgical treatment.
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