Electric surgical system and instrument

Application Number: 00107594
Application Date: 2000.05.22
Publication Number: 1274566
Publication Date: 2000.11.29
Priority Information: 1999/5/21 GB 9911954.7
International: A61B18/12;A61B18/14
Applicant(s) Name: Gyrus Medical Ltd.
Inventor(s) Name: Kirlin Charneys;Owan Gehou
Patent Agency Code: 11021
Patent Agent: zhu haibei
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, 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.