| 主权项 |
1. An insertion device that is inserted into a lumen, and is positioned relative to both of a first position inside of the lumen and a second position outside of the lumen, the insertion device comprising:
an insertion portion that includes a distal end and a proximal end in an axial direction, and includes a part having a fixing portion that is arranged at the distal end to be inserted into the lumen, and fixes the distal end side to the lumen at the first position, a part arranged at the proximal end side relative to the part having the fixing portion, and is not fixed to the lumen inside of the lumen, and a part arranged outside of the lumen; and a positioning portion that is attached to the part of the insertion portion arranged outside of the lumen, and positions the insertion portion at the second position, wherein the insertion portion applies a force of pulling the lumen from the first position fixed by the fixing portion to an entrance side of the lumen to shorten the lumen, the positioning portion slides relative to the insertion portion to be positioned at a peripheral region of the entrance of the lumen while being in contact with the peripheral region, and is fixed to the insertion portion by a force stronger that a force of elongating the shortened lumen. |
