| 摘要 |
An electrosurgical instrument is disclosed comprising a hollow tubular member open at one for connection by a hollow tubing to a source of vacuum and a side opening adjacent to the open end. The opposite end of the tubular member includes a tapered hollow nose portion which may be integral with the tubular member or a separate piece. An electrocauterizing blade is secured in and has one end extending outward from the end of the nose portion and the other end positioned inside the tubular member. Electric heating is provided for the electrocauterizing blade through an electric lead extending through the tubular member and through the side opening for connection to a power source. The electric heating is usually provided by application of high frequency current but may be provided by resistance heating. The nose portion has a plurality of openings adjacent to the tapered surface thereof for withdrawing smoke from a surgical area being cut and cauterized by means of vacuum connected to the end of the tubular member. Selectively control of the application of vacuum through the nose portion openings is provided by a tubular sleeve member supported for longitudinal movement on the nose portion to an extended position for selectively covering and uncovering the nose portion openings.
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