Patent ID: 8052682

Claim:
A high-frequency incision instrument for an endoscope, comprising: a flexible sheath; a rod electrode arranged at a distal end portion of the sheath, the rod electrode being remotely operated to move linearly along an axis of the sheath to protrude from/retract into the distal end portion of the sheath by an operation of an operating unit which is connected to a proximal end of the sheath; a stationary stopper fixed in the distal end portion of the sheath and a movable stopper provided at a proximal end portion of the rod electrode, the movable stopper contacting the stationary stopper to define a maximum protruding amount of the rod electrode from the distal end portion of the sheath, the proximal end portion of the rod electrode being screw-engaged with a member to which the movable stopper is formed, the rod electrode being rotatable by engaging a distal end portion of the rod electrode from outside the distal end portion of the sheath about an axis of the rod electrode to change a screw-engaged amount of the proximal end portion of the rod electrode with respect to the member to which the movable stopper is formed, a distance between a tip end of the rod electrode and the movable stopper being adjustable by rotating the rod electrode by engaging the distal end portion of the rod electrode outside the distal end of the sheath, wherein graduations are provided on an outer surface of the rod electrode over an entire extendible length of the rod electrode to indicate a protruding amount of the rod electrode with respect to the distal end of the sheath.