Importance

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Abstract

In an overtube, an effective length of an outer tube is 1200 mm or longer and 1700 mm or shorter, an effective length of an inner tube is 1400 mm or longer and 2000 mm or shorter, a first maximum protrusion length of an endoscope insertion part from a distal end of the inner tube is 100 mm or longer and 550 mm or shorter, and a second maximum protrusion length of the inner tube from a distal end of the outer tube is 200 mm or longer and 700 mm or shorter. A total maximum protrusion length, which is a sum of the first and second maximum protrusion lengths, is 300 mm or longer and 800 mm or shorter, and a maximum protrusion length ratio, which is a ratio of the first maximum protrusion length to the second maximum protrusion length, is 0.15 or more and 1.0 or less.

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First Claim