Patent ID: 9565991
Date: 2017-02-14
CPC Classifications: A61B

Claim:
1. An advance and retreat assist tool for an endoscopic treatment instrument, the advance and retreat assist tool comprising: a base unit comprising a hole portion through which the endoscopic treatment instrument to be inserted into an endoscope passes; an attachment portion which attaches the base unit to a treatment instrument insertion portion of the endoscope so that the hole portion faces a treatment instrument insertion hole portion provided in the treatment instrument insertion portion; a tubular member provided to advance and retreat relative to the base unit coaxially with a central axis of the hole portion; a fixing portion which fixes the endoscopic treatment instrument to the tubular member; a rotary portion which has an axis different from an axis of the tubular member, which rotates around an axis of the rotary portion and which is operated by a finger of a hand of an operator grasping a grasping portion of the endoscope; and an advance and retreat mechanism comprising a protrusion portion which is provided along a diametrical direction of the tubular member and which is engaged with an outer circumferential surface of the tubular member, and a spiral groove portion which is spirally provided in an outer circumferential surface of the rotary portion to wind around the axis of the rotary portion and with which the protrusion portion is engaged, the advance and retreat mechanism converting a rotation force of the rotary portion during the rotation of the rotary portion to an advance and retreat force to advance and retreat the tubular member in an axial direction of the tubular member, the advance and retreat mechanism transmitting the advance and retreat force to the tubular member and thereby advancing and retreating the tubular member.