Patent ID: 8167893

Claim:
An endoscopic treatment instrument comprising: a cylinder adapted to be fitted over a tip of an insertion section of an endoscope; a loop-shaped snare wire which protrudes in the cylinder from a snare sheath that is extendable and retractable with respect to the insertion section and which is extendable within the cylinder; a hooked portion which is radially inwardly extended from the circumference of a tip of the cylinder and which holds the snare wire within the cylinder; a locking portion provided on the hooked portion in front of a distal end of the snare wire and the snare sheath so as to face the distal end of the snare wire and the snare sheath; and an auxiliary hooked portion bent at an end part of the hooked portion and extending toward the proximal end of a cap portion, wherein when the snare wire advances to the locking portion, the locking portion contacts a folded-back portion of the snare wire and the locking portion and the auxiliary hooked portion holds the folded-back portion.