Patent ID: 8663238

Claim:
A treatment tool that is used in conjunction with an endoscope comprising: a flexible sheath having a lumen which extends along an axial direction of the flexible sheath; a pair of hole portions placed on a distal end portion of the flexible sheath in the axial direction of the flexible sheath, the pair of hole portions penetrating the flexible sheath from the outside of the flexible sheath; a wire passed through the pair of hole portions and having an exposed portion which is exposed to the outside of the flexible sheath between the pair of hole portions and an un-exposed portion which is located inside the lumen of the flexible sheath, the exposed portion being configured to deform so as to expand outwardly or contract inwardly in a radial direction of the flexible sheath; and a wire restricting portion fixed to an inside of the lumen at the vicinity of at least one of the pair of hole portions in the lumen of the flexible sheath so as to prevent a relative movement of the wire restricting portion to the pair of hole portions, the wire restricting portion having a guide groove formed along the radial direction and a pair of wall portions positioned at both sides of the guide groove in the radial direction of the flexible sheath, wherein when the exposed portion of the wire is expanded outwardly in the radial direction of the sheath for treatment, the un-exposed portion of the wire is capable of being inserted into the guide groove, the un-exposed portion of the wire is capable of being in contact with the pair of wall portions, the guide groove is configured to allow both the exposed portion and the un-exposed portion to move in the radial direction of the flexible sheath with respect to the wire restricting portion, the pair of wall portions are configured to allow the exposed portion to move in a circumferential direction of the flexible sheath with respect to the wire restricting portion, and the pair of wall portions are further configured to prevent the un-exposed portion of the wire from moving in the circumferential direction of the flexible sheath with respect to the wire restricting portion.