| 摘要 |
An over tube comprises an over tube body that has an inner diameter fitting over the outer diameter of an insertion part, and is flexible and expandable in the direction of the outer diameter, a gas supply port provided on the base end side of the over tube body, an expansion/contraction part that is formed integrally with the gas supply port, provided to communicate from the base end side to a predetermined position on a distal end side, and can expand in the direction of the outer diameter by injecting a gas from the gas supply port, and at least one channel that is provided between the inner and the outer diameters of the over tube body, and penetrates from the distal end of the over tube through the base end side.
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