Patent ID: 7588580

Claim:
A mucosa excising device using an endoscope comprising: a snare wire having a loop portion at a distal end portion of the snare wire; a substantially cylindrical cap including a cylindrical wall, and a holding mechanism configured to hold the loop portion of the snare wire along an inner peripheral surface of the cylindrical wall; and an attachment portion which attaches the cap to an end portion of the endoscope, wherein the holding mechanism has a plurality of engagement pieces and a plurality of corresponding portions which are arranged along the inner peripheral surface of the cylindrical wall, and engage the loop portion to hold the loop portion of the snare wire between the engagement pieces and the corresponding portions, said plurality of engagement pieces being inwardly protruding from the cylindrical wall and being respectively distanced from each other in a circumferential direction of the cylindrical wall; wherein when the snare wire is drawn in a proximal direction, at least protruded ends of the engagement pieces are displaced in the proximal direction by the loop portion, thereby allowing the loop wire to be released from between the engagement pieces and the corresponding portions, so that the loop portion is disengaged from the holding mechanism.