Patent ID: 8157811

Claim:
A treatment device for an endoscope, comprising a treatment portion in which an operation wire is forward/backward moveably inserted into a main tube of an elongated flexible tube to be inserted into a body, a tip end of the operation wire forms a loop for treatment by itself in a projection state from the main tube, and the loop is adapted to be retractable and storable in the main tube; wherein the treatment portion is formed with a wire rope comprising a single internal core strand wire having a substantially circular section and a plurality of side strand wires integrally formed on an outer periphery of the core strand wire and each having a substantially circular section, at least one side strand wire of the plurality of side strand wires is provided with a diameter larger than the other side strand wires so as to form a spiral convex portion continuous along the wire rope in a longitudinal direction, the sections of the other side strand wires each having a same diameter and together constitute a substantially circular section coaxial with the core strand wire having the substantially circular section, and a center of the at least one side strand wire which forms the spiral convex portion is located substantially on an outer circumference of a section of the substantial circular shape formed by the other side strand wires.