Patent ID: 8663095
Filing Date: 2014-03-04
Classification: A61B

Abstract:
1. A marker used in an endoscopic treatment tool to be inserted in a guide sheath, the marker comprising: a body; a fixing portion which is provided at the body; and an engaging portion which is provided at a radial direction outside of the body rather than the fixing portion of the body, wherein the fixing portion includes an insertion hole in which the endoscopic treatment tool is inserted, the engaging portion includes an engaging groove for fixing the body and the guide sheath by press-fitting a base end of the guide sheath into the engaging groove, the engaging groove formed in an annular shape and having an even surface, the insertion hole has a square cross-section having sides, in a state that the endoscopic treatment tool is inserted into the insertion hole, the endoscopic treatment tool is in contact with a part of the sides of the insertion hole and there is a clearance between a corner of the insertion hole and the endoscopic treatment tool, the body is fixed at a position on the endoscopic treatment tool due to a frictional force generated between the inner wall of the insertion hole and the endoscopic treatment tool such that the marker is capable of sliding relative to the endoscopic treatment tool in an axis direction of the endoscopic treatment tool, a projecting length of the endoscopic treatment tool from the guide sheath is capable of being changed by adjusting a fixing position of the body on the endoscopic treatment tool when the body and the guide sheath are not fixed at the engaging portion, and by moving the endoscopic treatment tool to which the body is fixed relative to the guide sheath, a wall surface of the engaging groove at a side of the insertion hole is pressed to a direction of the insertion hole and a fixation between the body and the endoscopic treatment tool is enhanced accompanied by the proximal end of the guide sheath being pressed into the engaging groove, and thereby restricting a change of the projecting length of the endoscopic treatment tool from the guide sheath.