Patent ID: 7785333

Claim:
An overtube comprising: an insertion portion that has a distal end portion and a proximal end portion, and at least the distal end portion thereof is adapted to be inserted into a subject; a first lumen that is formed in the insertion portion and that allows freely inserting and removing a device for carrying out medical procedures in the subject; puncture needles that pass through the insertion portion, have a control member connected to the proximal end portion of the insertion portion, and are adapted to puncture tissue; and one or more second lumens provided inside the first lumen, through which one or more of the puncture needles are passed, a distal portion of each of the one or more second lumens having an opening at a distal side of the first lumen, wherein the distal portion of each of the one or more second lumens has a direction with at least a radially inward component.