High-frequency treatment tool for endoscope

A high-frequency treatment tool for an endoscope, the high-frequency treatment tool comprising;

• an electrically insulating flexible tube insertable into an instrument channel of the endoscope;
• an operating wire comprising a core wire and a plurality of strand wires twisted around the core wire, wherein the operating wire is configured to be electrically conductive and movable inside the flexible tube in an axial direction of the flexible tube;
• the plurality of strand wires being removed from the operating wire at a distal end portion of the operating wire while a remaining portion of the core wire, at the distal end portion of the operating wire, defines a high-frequency electrode, wherein the high-frequency electrode is configured to be protrusible and retractable from a distal end of the flexible tube in the axial direction of the flexible tube according to movement of the operating wire;
• and
• a tubular member fitted on the distal end portion of the operating wire, the tubular member being plastically deformed and immovably attached onto the distal end portion of the operating wire in which the strand wires are maintained around the core wire, the deformation of the tubular member being caused as at least a part of the tubular member is deformed to interfere with an inner circumferential surface of the flexible tube so that the operating wire is halted with respect to the flexible tube at an arbitrary position in the flexible tube by frictional resistance caused between an interfering part of the tubular member and the inner circumferential surface of the flexible tube, and the high-frequency electrode to be protruded and retracted from the distal end of the flexible tube is halted in an arbitrary position.