Patent ID: 7857749

Claim:
A tubular treatment tool for an endoscope, comprising: a flexible tubular member, a groove traversing said flexible tubular member in a direction of a diameter of said flexible tubular member; an operation wire positioned within said flexible tubular member, said operation wire being movable relative to said flexible tubular member along an axis of said flexible tubular member; and a tissue collecting device attached to the distal end of said flexible tubular member, one circumferential portion of a distal end of said operation wire being secured to an inner circumferential surface of the tissue collecting device by brazing and a second circumferential portion of the distal end of said operation wire is not secured to the tissue collecting device, wherein a proximal end portion of the tissue collecting device is provided with protruded portions having a wedge-shaped cross-section that prevents removal of the tissue collecting device from the flexible tubular member, wherein the protruded portions are acuate, and wherein a gap exists between the second circumferential portion of the distal end of said operation wire and the inner circumferential surface of the tissue collecting device.