Patent ID: 7585298

Claim:
An endoscopic high-frequency knife, comprising: an insulating flexible sheath; a conductive wire inserted into said insulating flexible sheath; and a high-frequency cutting electrode, wherein said high-frequency cutting electrode is installed in said endoscopic high-frequency knife so that an outer surface of said high-frequency cutting electrode is exposed at a side surface of said insulating flexible sheath in the vicinity of an end thereof, wherein said conductive wire is electrically connected with said high-frequency cutting electrode, wherein said insulating flexible sheath includes a distal portion and a proximal portion which are separated from each other at a separation position behind said high-frequency cutting electrode on a proximal side thereof in the vicinity of said end of said insulating flexible sheath, wherein said distal portion and said proximal portion are connected to each other at said separation position to be freely rotatable relative to each other about a common axis which is also common with an axis of said insulating flexible sheath, so that said distal portion rotates about said common axis by rotating said conductive wire from a proximal end of said proximal portion, wherein a portion of said conductive wire in the vicinity of an end thereof is fixed to said distal portion to thereby prevent said distal portion from separating from said conductive wire even if said high-frequency cutting electrode breaks, and wherein an end of a core strand of said conductive wire, which is positioned in said proximal portion behind said high-frequency cutting electrode, is wound loosely around said conductive wire.