Patent ID: 7063661

Claim:
An endoscopic mucous membrane resection instrument comprising: a transparent cap section detachably attached to a distal end portion of an endoscope, the cap section including a cylindrical body having a distal end and a proximal end; a flexible tube for insertion of treatment instruments, the tube having a distal end portion and a proximal end portion, the tube being extended along an insertion section of the endoscope and the distal end portion of the tube being fixed in a state in which the distal end portion of the tube communicates with the cap section, when the cap section is attached to the endoscope; a first endoscopic treatment instrument for a mucous membrane resection work, which has an insertion section to be removably inserted in the tube, the first treatment instrument having a first loop portion for mucous membrane resection at a distal end portion of the insertion section thereof, the first loop portion being inserted in the tube such that it is projected from the distal end of the tube; an engagement portion which is provided at the distal end portion of the cylindrical body of the cap, the engagement portion being configured to removably fix the first treatment instrument at a first fixing position inside the cylindrical body; a second endoscopic treatment instrument having an insertion section to be removably inserted in the tube, the second endoscopic treatment instrument being inserted in the tube when the first treatment instrument is extracted from the tube after a first mucous membrane resection work by the first endoscopic treatment instrument, thereby performing a second mucous membrane resection work, the second treatment instrument having a second loop portion for mucous membrane resection at a distal end portion of the insertion section thereof; and an abutting portion which is provided in the cylindrical body of the cap, the abutting portion being configured to introduce the second loop portion to a second fixing position inside the cylindrical body when the second treatment instrument is inserted in the tube, and the second fixing position introduced by the abutting portion being closer to the proximal end of the cylindrical body than the first fixing position.