Electrosurgery system and instrument

Details Electrosurgery system and instrument Electrosurgery system and instrument

A - Human Necessities

61

B

A61B 18/14 (2006.01) A61B 18/12 (2006.01) A61N 5/00 (2006.01)

Patent

CA 2308879

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, using a detector with an isolated output, and generator output power is controlled so as to limit the d.c. voltage 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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