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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0737302 (1996-10-21) |
| 우선권정보 | GB-0000356 (1996-01-09) |
| 국제출원번호 | PCT/GB96/01472 (1998-06-20) |
| §371/§102 date | 19961026 (19961026) |
| 국제공개번호 | WO-9700646 (1997-01-09) |
| 발명자 / 주소 |
|
| 출원인 / 주소 |
|
| 대리인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 714 인용 특허 : 288 |
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 and a return electrode which is electricall
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 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.
[ We claim:] [1.] An electrosurgical instrument for the treatment of tissue in the presence of an electrically-conductive fluid, the instrument comprising an instrument shaft and an electrode assembly at one end of the shaft, the electrode assembly comprising:a tissue treatment electrode,a return el
[ We claim:] [1.] An electrosurgical instrument for the treatment of tissue in the presence of an electrically-conductive fluid, the instrument comprising an instrument shaft and an electrode assembly at one end of the shaft, the electrode assembly comprising:a tissue treatment electrode,a return electrode, andan insulation member which electrically insulates the return electrode from the tissue treatment electrode,the tissue treatment electrode being exposed at the extreme distal end of the instrument, andthe return electrode having a fluid contact surface axially spaced from the exposed end of the tissue treatment electrode by the insulation member so that, in use, the return electrode does not contact the tissue to be treated,wherein the instrument further comprises, a feeder for feeding cool 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 electrode and the return electrode, andan extractor for removing heated electrically-conductive fluid from the region of the exposed end of the tissue treatment electrode.
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