Covidien LP

Eric J Larson

Alexander M Waskiewicz

Carolyn Gaye Ford

Joe Don Sartor

James A Gilbert

Arlen K Ward

John A Hammerland, Iii

Joshua H Johnson

Braddon M Van Slyke

Brian L Roberts

Patrick J Digmann

Carolyn Ford

A surface ablation system includes an electrosurgical generator, and elongated shaft, a plug, and a circuit assembly. The elongated shaft includes a proximal end portion and a distal end portion. The plug is supported on the distal end portion of the elongated shaft. The circuit assembly is supported on the plug and in electrical communication with the electrosurgical generator. The circuit assembly includes spaced-apart traces positioned in arrays about the plug. Each of the traces is configured to emit electrosurgical energy along the arrays to treat tissue positioned adjacent to the traces.

Surface ablation using bipolar RF electrode

An electrosurgical generator is disclosed. The generator includes an RF output stage configured to generate at least one electrosurgical waveform including a plurality of cycles; at least one sensor coupled to the RF output stage, the at least one sensor configured to measure a voltage and a current of the at least one electrosurgical waveform; and a controller coupled to the at least one sensor and the RF output stage, the controller including a proportional-integral-derivative controller having at least one of voltage limiter or a current limiter, the proportional-integral-derivative controller configured to saturate the RF output stage based on voltage-current characteristics of the RF output stage.

System and method for power control of electrosurgical resonant inverters

The electrosurgical systems and methods of the present disclosure include a tissue resistance measurement system that compensates for capacitive parasitics in a cable connecting an electrosurgical generator to and electrosurgical cable to estimate the real resistance of a tissue load. The electrosurgical generator includes an output stage coupled to an electrical energy source and generates electrosurgical energy. The electrosurgical generator includes a plurality of sensors sensing a voltage and current of the electrosurgical energy and a controller controlling the output stage. The controller includes a calculator that calculates a real part of an impedance based on the sensed voltage and current, an estimator that estimates a resistance of the tissue using a solution to a quadratic equation that is a function of the real part of the impedance, and a control signal generator configured to generate a control signal for the output stage based on the resistance of the tissue.

Systems and methods for measuring tissue impedance through an electrosurgical cable

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Broomfield, CO, United States of America

Eric J Larson