Method for creating a virtual electrode for the ablation of tissue and for selected protection of tissue during an ablation
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United States of America Patent
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Dec 17, 2002
Grant Date -
May 16, 2002
app pub date -
Jul 6, 1999
filing date -
Jul 7, 1998
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The present invention provides an apparatus and a method for producing a virtual electrode within or upon a tissue to be treated with radiofrequency alternating electric current, such tissue including but not limited to liver, lung, cardiac, prostate, breast, and vascular tissue and neoplasms. An apparatus in accordance with the present invention includes a radiofrequency alternating electric current source and a radiofrequency ablating a fluid source. A surgical instrument is connected to both the current source and the fluid source for delivering a fluid and a current to a first portion of tissue to be ablated. The apparatus also includes a protective fluid source and a delivery system connected to the protective fluid source for delivery of protective fluid to a secondary portion of tissue whose ablation is not desired. A method in accordance with the present invention will include the steps of providing a radiofrequency ablating fluid to a first portion of tissue to be ablated, providing a radiofrequency alternating electric current to the first portion of tissue to be ablated, and providing a protective fluid to a second portion of tissue whose ablation is not desired.
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