#$%^&*AU2007200289B220130124.pdf#####SYSTEM AND METHOD FOR CLOSED LOOP MONITORING OF MONOPOLAR ELECTROSURGICAL APPARATUS ABSTRACT An electrosurgical system (1) is disclosed comprising a generator (10) configured to electrosurgical coagulation waveforms. The generator (10) includes a closed loop control system for controlling the electrosurgical coagulation waveforms. The closed loop control system includes a sensor (32) configured to sense a tissue property and/or an 5 energy property and to transmit the tissue property and/or the energy property as one or more sensor signals having an amplitude. The control system also includes a gain controller (34) configured to process the at least one sensor signal to reduce the amplitude of the sensor signals and to obtain a signal to noise ratio of the at sensor signals within a predetermine range. A microprocessor (22) is coupled to the generator (10) and is 10 configured to adjust the electrosurgical coagulation waveforms as a function of the sensor signals.1/2 1018 1 ELECTRO- 14 p SURGICAL GENERATOR 16 FIG. 1 -- 1------------------- Active Microprocessor HVPSRF Output _ _Electrode 22 WPS14 28 Stage Return Controller Electrode 16 26 Gain RF Controller Sensor 34 34 50-1 FIG. 2
