Stryker Corporation

Versatile Power, Inc.

David I Brubaker

David Hoffman

Steffan A Benamou

Andrew J Hamel

Alexandr Ikriannikov

An electrosurgical system includes an electrosurgical probe connected to a control console, wherein the probe is capable of coagulating and ablating tissue depending on a selected operating mode. Before operating the system, probe-specific data stored in a memory device associated with the probe is read by a processing device in the console. The data includes source impedance values specific to a coagulation or cutting mode of operation. A constant duty cycle value for a modulated cutting mode also is provided. Depending on the operating mode selected, an RF generator adjusted to have a predetermined source impedance value provides a voltage value to the probe. During the duty-cycled mode, the RF generator generates an instantaneous voltage value output for a duty cycle portion that is less than 100% of a time period, which value is no less than a maximum continuous average voltage value for the electrosurgical probe.

Method and system for adjusting source impedance and maximizing output by RF generator

A system and method for driving ultrasonic transducers and improvements to a phase track controller for reducing loss of lock occurrence is disclosed and described.

Phase track controller improvement to reduce loss of lock occurrence

Method for adjusting source impedance and maximizing output by RF generator

A transducer is optimally driven at or near its resonant frequency by a driver system that adapts to variations and/or changes to the resonant frequency of the transducer due to variations in piezo materials, manufacturing, assembly, component tolerances, and/or operational conditions. The system may include an output controller, a phase track controller, a frequency generator, a drive, circuitry to determine a phase angle between the transducer voltage and transducer current, and circuitry to obtain transducer admittance from the transducer voltage and transducer current.

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San Carlos, CA, United States of America

David I Brubaker