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Abstract

An electrosurgical generator control responds to tissue impedance between active and return electrodes during desiccation. Active and return generator leads to supply energy and a user control sets the level of energy desired for electrosurgery. Voltage and current sensing circuits respond to high frequency energy in the leads to signal voltage and current in the leads. A multiplier receives the signals to calculate power. A clock sets units of time during for which power calculation. An integrator calculates the energy supplied through the leads per time unit. The user control sets a reference signal for the energy level desired. A correlation circuit receives the energy calculations from the integrator and the reference signal and provides a feedback signal to indicate when the energy calculation equals the user control setting for altering the generator supply of energy to the leads. A counter assesses the number of packets of energy delivered against a setting of the user control and the total energy delivered is a function of multiple packet sequences containing pulses wherein the time between the pulses is controlled by the user control. The method uses the automatic control in measuring impedance during tissue desiccation and altering the output of an electrosurgical generator.

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First Claim