Patent ID: 8915910

Claim:
A electrosurgical system for application of treatment energy to a patient involved in bipolar electrosurgery, the system comprising: an electrosurgical generator configured to generate and output a treatment energy along with a measurement signal; an electrosurgical control unit configured to direct the output of treatment energy and a measurement signal; and a bipolar electrosurgical tool removably connected to one of the electrosurgical generator and the electrosurgical control unit and arranged to contact tissue via similarly sized electrodes on movable jaws and apply the treatment energy and the measurement signal to the tissue between the electrodes, wherein the electrosurgical control unit is configured to measure permittivity and conductivity of the tissue through the application of the measurement signal, determine an initial phase angle based on a product of the measured permittivity and conductivity of the tissue, and determine an end point phase angle from the determined initial phase angle, the end point phase angle being a phase difference between applied voltage and current of the treatment energy and indicating fusion of the tissue in direct contact with the electrodes and the electrosurgical control unit disrupts the application of the treatment energy when a phase angle of the applied treatment energy exceeds the end point phase angle.