Patent ID: 6251106
Filing Date: 2001-06-26
Classification: A61B

Abstract:
A control circuit for providing a constant power output in an electrosurgical generator, the generator having a power selection system which supplies a high voltage output to create electrosurgical energy at a pair of output electrodes, the control circuit comprising:a current sampling circuit inductively coupled to one of the output electrodes;a linear conversion circuit coupled to the current sampling circuit and the power selection system of the electrosurgical generator; anda feedback correction circuit coupled to the liner conversion circuit, the power selection system and a radiofrequency stage, the feedback correction circuit being adapted to receive a control voltage signal from the power selection system and a linear converted signal from the linear conversion circuit to produce a feedback control signal, the feedback control signal adapted to be supplied to the power selection system to control electrosurgical energy created at the pair of output electrodes.