Smith + Nephew

Myers Surgical Solutions, LLC

Douglas M Lorang

Karen Drucker

Matthew C Summitt

Kobi Iki

Mathew Erle Mitchell

Mark D Markel

Alan P Gannon

William M Ambrisco

Richard Ranalli

Ryland B Edwards, Iii

Daniel J Triplett

Matthew E Mitchell

Yan Lu

Daniel F Justin

Marie Meyer

Ephraim Akyuz

Andrew R Fauth

Joseph A Fritz

M Mary Sinnott

Thomas H Myers

Jason M Glad

An electrosurgical instrument for ablating cartilage while limiting collateral damage includes a non-conducting head with a small electrically conductive surface. The head of the instrument is coupled to a shaft by a flexible portion. The flexible portion biases the electrically conductive surface towards a tissue surface. The head is pivotably coupled to the shaft such that the electrically conductive surface is oriented substantially parallel to the tissue surface as the head slides across the tissue surface. A method of performing electrosurgery includes positioning the electrically conductive surface adjacent to the tissue surface, and sliding the shaft across the tissue surface with the head pivoting such that the electrically conductive surface is oriented substantially parallel to the tissue surface.

Cartilage treatment probe

A method and apparatus include determining a value of a parameter associated with operation of an electrosurgical probe having a particular probe design, and determining whether the value of the parameter is within a range of values that has been predetermined for the particular probe design to indicate that the probe is treating tissue in a desired manner. Power is delivered to the probe according to an algorithm based upon a determination that the value of the parameter is outside the range of values The algorithm delivers power in a pulsed profile including portions of low power and portions of high power. In one embodiment, the tissue treatment is ablation, the parameter is impedance, and the method limits tissue necrosis to less than 200 microns. In another embodiment, the tissue treatment is shrinkage, the parameter is temperature, and the method limits power delivery when the probe is not shrinking tissue.

Electrosurgical power control

An electrosurgical instrument includes a shaft, a flexible portion, and a head coupled to the shaft through the flexible portion and pivotably coupled to the flexible portion. The head includes a non-conductive surface and an electrically conductive surface. The flexible portion is configured to bias the non-conductive surface and the electrically conductive surface towards a tissue surface, such as cartilage. The non-conductive surface may include a material having a thermal conductivity less than or equal to about 30 W/m*K and/or a volume resistivity greater than or equal to about 1&#xd7;10ohm*cm. The non-conductive surface may include a ceramic such as Macor&#xae; ceramic, ZTA ceramic, and/or 99.5% alumina ceramic.

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Ripon, CA, United States of America

Douglas M Lorang