Patent ID: 8460179

Claim:
A balloon unit for an endoscope apparatus comprising: a first balloon for an endoscope apparatus having first and second openings and opposing each other at opposite ends of a bulbous region, each of said first and second openings having a different diameter than an inner diameter of said bulbous region so as to be formed in a cylindrical shape in which an insert member including one of an insert part of an endoscope and an insert supporter having the insert part inserted therein is inserted; and a cylinder body separate from said insert member and having an inner diameter larger than an outer diameter of the insert member; wherein the first opening of the first balloon is fitted over and fixed to the insert member therein; and the second opening of the first balloon is fitted over and affixed to the cylinder body to form a unit and the unit is attached to the insert member or detached from the insert member; and wherein a flow passage for supplying and sucking fluid into/from the balloon for an endoscope apparatus is formed in the cylinder body; a second balloon for attachment, through which the insert member is inserted, is provided on an inner side of the cylinder body, the cylinder body is fixed to the insert member by expanding the second balloon for attachment so that the second balloon for attachment presses an outer circumferential surface of the insert member, and further the flow passage of the cylinder body is branched to communicate with the second balloon for attachment; and a branch passage of the flow passage is provided with a check valve that prevents the fluid from flowing out from the second balloon for attachment.