| 摘要 |
In an over tube 50 of the present invention, an air release hole 80 is formed at a base end part side from a second balloon attaching position of the over tube 50, and the air release hole 80 is opened at a base end part of a tube body 51 via an air tube 82 as a suction port 84. When an operation of drawing in an intestinal canal 70 is performed by performing a drawing operation of the over tube 50, the air stored in a gap between the tube body 51 and an intestinal wall flows in from the air release hole 80 of the tube body 51, and is discharged to outside air from the suction port 84 formed at the base end part of the tube body 51 via the air tube 82. <IMAGE> |
