Helical needle apparatus for creating a virtual electrode used for the ablation of tissue
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United States of America Patent
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Mar 25, 2003
Grant Date -
Dec 5, 2002
app pub date -
Jul 6, 1999
filing date -
Jul 7, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A surgical apparatus for delivering a conductive fluid to a target site for subsequent formation of a virtual electrode to ablate bodily tissue at the target site by applying a current to the delivered conductive fluid. The surgical apparatus includes an elongated device forming a helical needle. The helical needle is configured to engage bodily tissue and is hollow for delivering conductive fluid from a fluid source. Finally, the helical needle terminates in a needle tip. In one preferred embodiment, an electrode is associated with the helical needle for applying a current to conductive fluid delivered from the helical needle. During use, following delivery of conductive fluid, the electrode applies a current to the delivered conductive fluid for creating a virtual electrode. The virtual electrode ablates bodily tissue contacted by the conductive fluid.
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