Patent ID: 8486100

Claim:
A guide tube equipped with a balloon for puncture, comprising: a main body tube equipped with a balloon on a main body tube tip end-side surface, the main body tube having: a main lumen for insertion of an endoscope, which penetrates from a rear end to the tip end-side; and a sub lumen brought in gas/liquid communication with the inside of the balloon, the main lumen being provided, at a main lumen rear end, with an endoscope insertion part, and the sub lumen being provided, at a sub lumen rear end, with connectors for inflating and contracting operations of the balloon, wherein the balloon on the tip end-side surface is used as an outer balloon, a needle through hole, through which a puncture needle passes, is formed in a wall surface of the main body tube located inside the outer balloon, the needle through hole is blocked air-tightly with an inflatable sheet material, and the inflatable sheet material is provided as an inner balloon, the inner balloon being so formed that, upon inflation of the outer balloon, the inner balloon inflates and projects from the needle through hole toward the inside of the main lumen due to internal pressure of the outer balloon, so that a tip end of the puncture needle can be pierced into an inflating and projecting part.