SYSTEMS AND METHODS FOR ELECTROSURGICAL TISSUE TREATMENT IN THE PRESENCE OF ELECTRICALLY CONDUCTIVE FLUID

WIPO Patent Application WO2000009053

A9

Systems and methods are provided for applying a high frequency voltage in the presence of an electrically conductive fluid to create a relatively low temperature plasma for ablation of tissue adjacent to, or in contact with, the plasma. In one embodiment, an electro-surgical probe (20) or catheter is positioned adjacent the target site so that one or more active electrode(s) (120) are brought into contact with, or close proximity to, a target tissue in the presence of electrical conductive fluid. High frequency voltage is then applied between the electrode terminal(s) (120), and one or more return electrode(s) (112) to generate a plasma adjacent to the active electrode(s), and to volumetrically remove or ablate at least a portion of the target tissue. The high frequency voltage penetrates electric fields around the active electrode(s) with sufficient energy to ionize the conductive fluid adjacent to the active electrode(s). Within the ionized gas or plasma, free electrons are accelerated, and electron atoms collisions liberate more electrons. The process cascades until the plasma contains sufficient energy to break apart the tissue molecules, causing molecular dissociation, and ablation of the target tissue.

BAKER MICHAEL A
BRUNELL STEPHEN M
WOLOSZKO JEAN
UNDERWOOD RONALD A
THAPLIYAL HIRA V
EGGERS PHILIP E

PCT/US1999/018289

August 22, 2002

August 11, 1999

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ARTHROCARE CORP (US)

A61B18/12; A61B18/00; A61B18/14; A61M25/01; A61B17/00; A61B17/22; A61B19/00; A61F2/02; A61F2/06; A61F2/84; A61M1/00; A61M3/02; (IPC1-7): A61F7/12

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