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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0049728 (1998-03-27) |
| 우선권정보 | GB-0000355 (1996-01-09) |
| 발명자 / 주소 |
|
| 출원인 / 주소 |
|
| 대리인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 854 인용 특허 : 290 |
In an electrosurgical instrument for the treatment of tissue in the presence of an electrically conductive fluid medium, a bipolar electrode assembly has an active electrode with an exposed tissue treatment portion, a return electrode having an exposed fluid contact surface, and an insulating member
In an electrosurgical instrument for the treatment of tissue in the presence of an electrically conductive fluid medium, a bipolar electrode assembly has an active electrode with an exposed tissue treatment portion, a return electrode having an exposed fluid contact surface, and an insulating member positioned between and electrically insulating the active electrode and the return electrode. The insulating member serves to space apart the exposed active electrode treatment portion and the exposed fluid contact portion of the return electrode. The dimensions and configurations of the exposed portions of the electrodes and of the insulating member are such that, when the electrode assembly is immersed in a conductive fluid medium, the ratio between the longest and shortest conduction path lengths between the active and return electrodes is greater than or equal to 1.25 to 1. The invention also includes a combination of an electrosurgical instrument and a radio frequency generator.
[ We claim:] [1.] An electrosurgical instrument for the treatment of tissue in the presence of an electrically conductive fluid medium, the instrument comprising an instrument shaft and an electrode assembly at a distal end of the shaft, wherein the electrode assembly comprises:a single active elect
[ We claim:] [1.] An electrosurgical instrument for the treatment of tissue in the presence of an electrically conductive fluid medium, the instrument comprising an instrument shaft and an electrode assembly at a distal end of the shaft, wherein the electrode assembly comprises:a single active electrode having an exposed tissue treatment portion,a return electrode having an exposed fluid contact surface, andan insulating member positioned between and electrically insulating the active electrode and the return electrode and serving to space apart the exposed treatment portion of the active electrode, and the exposed fluid contact surface of the return electrode, the fluid contact surface of the return electrode being set back in the direction of a treatment axis of the assembly from the active electrode exposed treatment portion,and wherein the dimensions and configuration of the exposed treatment portion, the exposed fluid contact surface and the insulation member are such that when the electrode assembly is immersed in a conductive fluid medium the ratio of (i) the length of the shortest conduction path (P.sub.1) through the fluid medium between the exposed fluid contact surface and that part of the exposed treatment portion which is furthest from the exposed fluid contact surface, to (ii) the length of the shortest conduction path (P.sub.2) through the fluid medium between the exposed fluid contact surface and the exposed treatment portion, is greater than or equal to 1:25 to 1.
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