Surgery – Instruments – Electrical application
Reexamination Certificate
2007-10-02
2007-10-02
Johnson, III, Henry M (Department: 3739)
Surgery
Instruments
Electrical application
C606S032000, C606S050000
Reexamination Certificate
active
10661118
ABSTRACT:
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 electrosurgical probe or catheter is positioned adjacent the target site so that one or more active electrode(s) are brought into contact with, or close proximity to, a target tissue in the presence of electrically conductive fluid. High frequency voltage is then applied between the active electrode(s) and one or more return electrode(s) to non-thermally 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 generates 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, and the process cascades until the plasma contains sufficient energy to break apart the tissue molecules, causing molecular dissociation and ablation of the target tissue.
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pat
Davison Paul O.
Jenkins Tom
Woloszko Jean
ArthroCare Corporation
Johnson, III Henry M
Szymczak Brian E.
LandOfFree
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