Importance

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Abstract

Provided is an overtube with improved insertability of a distal end side of the overtube into a digestive tract. An overtube includes a supply and discharge port for supplying and discharging a fluid, a first region that is located on a distal end side with respect to the supply and discharge port and includes an outer tube, an inner tube, and a shape-deformable body, and a second region that is located on the distal end side with respect to the first region and includes the outer tube and the inner tube. The first region is switchable between a first state in which the fluid is supplied to a tube inner space between the outer tube and the inner tube via the supply and discharge port and a second state that is stiffer than the first state and in which the fluid is discharged, and the second region is softer than the second state of the first region.

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First Claim