Patent ID: 8038597

Claim:
An instrument for an endoscope, which is able to move reciprocally in a channel of the endoscope along a guide wire, comprising; a sheath portion having a guide lumen into which the guide wire is inserted and another lumen disposed along the guide lumen, the proximal end of the sheath portion being bifurcated into a first sheath portion having the guide lumen and a second sheath portion having the another lumen; an instrument distal end portion for carrying out treatment on a portion to be treated, connected to the distal end of the sheath portion; a first operating portion for inserting and pulling out the guide wire, connected to the proximal end of the first sheath portion; a second operating portion for operating the instrument distal end portion, connected to the proximal end of the second sheath portion; and a second connection portion provided on the first operating portion, and which allows the second operating portion to detachably engage and disengage with the first operating portion; wherein one end of the second connection portion is fixed to the first operating portion, the second operating portion is attachable to and detachable from another end of the second connection portion fixed to the first operating portion; and when the second operating portion is attached to the first operating portion via the second connection portion, a center axis of the first sheath portion connected to the first operating portion and a center axis of the second sheath portion connected to the second operating portion are maintained at a predetermined angle and predetermined distance with respect to each other, the predetermined angle being an acute angle.