| 摘要 |
An electrosurgical instrument comprises a body portion, an actuator mechanism associated with the body portion, and first and second jaw members each having a jaw body. The first jaw member includes a first electrode having a relatively large area conductive seal surface and a relatively smaller area edge portion. The second jaw member includes a second electrode also having a relatively large area conductive seal surface and a relatively smaller area edge portion. The first jaw member comprises a third electrode associated with its jaw body, and an insulator separating the first electrode from the third electrode. Operation of the actuator mechanism moves one or both of the first and second jaw members between a first position in which the jaw members are open, a second position in which the first and second jaw members are sufficiently closed so as to be capable of grasping tissue therebetween, and a third position in which the first and second jaw members are further closed such that the conductive seal surfaces are adjacent to one another other such that predominantly the edge portions of one or both of the seal surfaces are exposed. The exposed area of the third electrode is greater than that of the exposed edge portions. When the electrosurgical instrument is connected to an electrosurgical generator, the electrosurgical generator is capable of directing a coagulating RF waveform between the first and second electrodes when the jaw members of the electrosurgical instrument are in their second position with tissue grasped therebetween. The electrosurgical generator is also capable of directing a cutting RF waveform between one or both of the first and second electrodes and the third electrode, when the jaw members of the electrosurgical instrument are in their third position.
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