| 摘要 |
PCT No. PCT/GB96/01472 Sec. 371 Date Oct. 26, 1996 Sec. 102(e) Date Oct. 26, 1996 PCT Filed Jun. 20, 1998 PCT Pub. No. WO97/00646 PCT Pub. Date Jan. 9, 1997An 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 and a return electrode which is electrically insulated from the tissue treatment electrode by means of an insulation member. The tissue treatment electrode is exposed at the extreme distal end of the instrument, and the return electrode has a fluid contact surface spaced from the exposed end of the tissue treatment electrode by the insulation member. The instrument further comprises feed means for feeding electrically-conductive fluid to the region of the exposed end of the tissue treatment electrode 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.
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