High-frequency knife for cutting living tissue has protrusion whose front end comprises electrical insulator which covers electrode so that edge portion at side of base of electrode extends to side of protrusion

摘要

The knife has a protrusion (66) popped in and out from front end of a main portion (20) in an axial direction. The front end of the protrusion has an electrical insulator (74) which covers an electrode (72) so that an edge portion at the side of base of the electrode extends to the side of the protrusion, exposing the electrode.