Patent ID: 7749156

Claim:
A retractable treatment instrument for an endoscope, comprising: a flexible sheath comprising at least a tip portion thereof formed of a flexible tube; an operation wire inserted in the flexible sheath, the operation wire configured to move in an axial direction within the flexible sheath; and a front-end treatment member attached to a tip of the operation wire, a tip portion of the front-end treatment member comprises a flat rod, and a flat shape of the flat rod being oriented along the axial direction of the flexible sheath, wherein the front-end treatment member is configured to move back and forth—along the axial direction with respect to a tip of the flexible sheath, the front-end treatment member having a wide part elongated in a radial direction of the flexible tube, wherein the wide part is configured to press and broaden the flexible tube from an inside of the flexible tube, the wide part being formed integrally with a base portion of the front-end treatment member, corner portions of the wide part being cut away such that each edge of the wide part bends at a predetermined degree, wherein the flexible sheath has at least one expanded part in which the wide part of the front-end treatment member is configured to fit, the at least one expanded part being located at a part of the flexible sheath comprising the flexible tube, and wherein the at least one expanded part is formed by pressing a part of the flexible tube from both sides of the flexible tube so that the part of the flexible tube is expanded in a direction perpendicular to a pressing direction in which the flexible tube is pressed.