Patent ID: 8105323
Filing Date: 2012-01-31
Classification: A61B

Abstract:
1. An electrosurgical system comprising: an electrosurgical generator adapted to supply electrosurgical energy to tissue; a microprocessor configured to generate a target impedance trajectory having at least one slope, wherein the target impedance trajectory includes a plurality of target impedance values, the microprocessor also configured to drive tissue impedance along the target impedance trajectory by adjusting the output level to substantially match tissue impedance to a corresponding target impedance value, the microprocessor further configured to compare tissue impedance to a threshold impedance value and adjust output of the electrosurgical generator when the tissue impedance is equal to or greater than the threshold impedance; and an electrosurgical instrument including at least one active electrode adapted to apply electrosurgical energy to tissue, such that the tissue impedance is monitored in real-time in one or more closed loop control configurations by at least one control module that regulates the electrosurgical energy received from the generator, the one or more closed loop control configurations being an inner control loop configuration for controlling a first set of variables, the first set of variables selectively used to derive a second set of variables and an outer control loop configuration for providing additional control of a subset of at least one of the first and second sets of variables of the inner control loop.