| 摘要 |
The invention provides a handpiece which can prevent a visual field of an endoscope from being disturbed by jetting of irrigation liquid, and which can perform safely and reliably selective separation of biological tissue such as a blood vessel or the like by ultrasonic vibration, in operation under a visual field of an endoscope which is restricted in operation. The handpiece for surgical operation in which a tip section has a length thereof corresponding to 5/4 or 7/4 times wavelength, a forward end of the tip section is curved in an arcuate form, and a tip cover is provided with a tip top cover at a forward end of the tip cover, which is detachable, which is semi-transparent or transparent, and which has an inclined surface, to prevent irrigation liquid from scattering. Further, the tip cover of an ultrasonic surgical knife is provided with an auxiliary cavity for a laser probe, and a spatula-like projection is provided at the forward end of the cover, whereby the applied scope or range is further widened. The main cavity and the auxiliary cavity for the tip are closed by an O-ring gas-tight packing or a gas-tight closure to prevent pneumoperitoneum gas within an abdomen cavity from leaking.
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