Electrosurgical instrument
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United States of America Patent
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Jan 16, 2001
Grant Date -
N/A
app pub date -
May 26, 1999
filing date -
Jun 23, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An electrosurgical instrument, which is used to treat tissue in the presence of an electrically-conductive fluid, comprises an instrument shaft and an electrode assembly at one end of the shaft. The electrode assembly comprises a tissue treatment electrode (11) and a return electrode (12) which is electrically insulated from the tissue treatment electrode by means of an insulation member (15). The tissue treatment electrode (11) is exposed at the extreme distal end of the instrument, and the return electrode (12) has a fluid contact surface spaced from the exposed end of the tissue treatment electrode by the insulation member (15). The instrument further comprises feed means (17) for feeding electrically-conductive fluid to the region of the exposed end of the tissue treatment electrode (11) in such a manner as to define, in use, a conductive fluid path that completes an electrical circuit between the tissue treatment and the return electrode (12).
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