Patent ID: 7255694

Claim:
An electrosurgical generator capable of varying both the output crest factor and output power of at least one waveform based on the changing impedance of tissue during electrosurgery, said electrosurgical generator comprising: a processing unit for receiving at least one signal indicative of an output voltage and an output current of the at least one waveform, said processing unit executing a set of programmable instructions for determining the tissue impedance using the output voltage and output current of the at least one waveform and transmitting at least one waveform adjustment signal; and a waveform generator for receiving the at least one waveform adjustment signal which alters the duty cycle of the at least one waveform to adjust the output crest factor and output power of the at least one waveform based on the determined tissue impedance, wherein said at least one waveform adjustment signal includes data to alter the duty cycle of the at least one waveform generated by the waveform generator in accordance with the following formula: CF=[(1−D)/D] 1/2 , wherein D is the duty cycle and CF is the crest factor of the generated waveform.