Electrosurgical system

An electrosurgical generator for performing surgical procedures on body tissue of a patient comprising:

• a power supply;
• a signal generation module electrically coupled to the power supply, the signal generation module configured to generate a radiofrequency signal;
• a first tool port configured to interface with an electrosurgical tool having tool data stored therein;
• the first tool port adapted to receive the tool data stored on the electrosurgical tool and to supply the radiofrequency signal from the signal generation module to the tool;
• a power port adapted to couple the generator to a direct current device and to supply direct current voltage to the direct current device, the power port having a micro switch that when activated causes a tool interface circuit to update a user interface display indicating that a direct current device has been coupled to the generator and status of the direct current device;
• and
• a microcontroller configured to monitor the phase angle between a voltage and a current of the radiofrequency signal by continuously supplying a measurement signal having a frequency different form the radiofrequency signal and to determine an electrosurgical procedure endpoint indicating fusion of tissue in contact with the electrosurgical tool based on the monitored phase angle, the microcontroller disrupting the supply of the radiofrequency signal and the measurement signal when the monitored phase angle equals or exceeds the electrosurgical procedure endpoint indicating fusion of the tissue.