Patent ID: 8961558
Filing Date: 2015-02-24
Classification: A61B

Abstract:
1. A treatment tool for an endoscope comprising: a forcep sheath; a first forcep member and a second forcep member which are attached to a distal end of the forcep sheath, and which cooperate with each other to be openable/closable; an operation wire which is movably arranged in the forcep sheath along an axial direction thereof, which is connected to at least one of the first forcep member and the second forcep member, and which opens/closes at least one of the first and second forcep members relative to the other of the first and second forcep members when moved in the axial direction, wherein a sharp needle-shaped portion having a tip to pierce a biopsy tissue is formed on a distal end of the first forcep member, the sharp needle-shaped portion extending farther distally than a distal end of the second forcep member, the tip of the sharp needle-shaped portion projects in a direction substantially parallel with a central axis of the forcep sheath in order to pierce a biopsy tissue during a distal movement of the forcep sheath while at least the first forcep member is in a closed state, and the sharp needle-shaped portion is arranged so that at least a portion thereof overlaps the second forcep member in a direction perpendicular to the axial direction when the first and second forcep members are in the closed state when viewed from a location distal to the first forcep member along the central axis of the forcep sheath, and the sharp needle-shaped portion comprises a triangular pyramid shape which includes first, second and third ridges, the first ridge being arranged further from the central axis of the sheath in the direction perpendicular to the axial direction than the second and third ridges; wherein the portion of the sharp needle-shaped portion includes a projection which is exposed in the direction perpendicular to the axial direction when the first and second forcep members are in the closed state.