| 摘要 |
ELECTROSURGICAL INSTRUMENT WITH EXTENDABLE SHEATH FOR IRRIGATION AND ASPIRATION An electrosurgical instrument having a protective, extendable and retractable sheath or sleeve is disclosed. The sheath is disposed around and coaligned with an elongated cylindrical rod, from which extends at least one electrode. A conductor extending from the electrode is joined to a conventional power supply cord for connection to a source of RF voltage. Power supply is regulated using either a conventional hand or foot switch. The sheath protects the distal electrode(s) as the instrument is inserted through a laparoscopic trocar or endoscope. It also provides an effective extension of an irrigation/aspiration lumen which extends along the length of the cylindrical rod. The proximal end of the irrigation/aspiration lumen is joined to a supply tube which either may be connected to a fluid reservoir for irrigation or to a collection reservoir for aspiration of fluids. Alternative embodiments feature alternative mechanisms for extending the sheath. In one embodiment, the sheath is retractable and shields the electrode(s) only when placed in a distal, extended position. When this sheath is disposed proximally, the electrode is exposed for use. When the sheath is disposed distally, it permits fluid travelling through the irrigation lumen to be delivered more precisely to a region of tissue, because the projection of the electrode no longer interferes with placement. In another embodiment, the cylindrical rod-shaped housing on which the electrode resides is retractable. When the cylindrical rod is withdrawn to a proximal, retracted position with the sheath, it shields the electrode and extends the effective end of the irrigation lumen.
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