PROBLEM TO BE SOLVED: To provide a device for an alimentary canal, which is used for a bypass operation effective for diabetes and obesity treatment, and which can suitably prevent the onset of diarrhea and dumping syndrome.SOLUTION: A device 100 for an alimentary canal includes: a cylinder part 110 that has a through-hole 111 an indwelling part 120 that is provided on the base end side of the cylinder part and that indwells the cylinder part in an organism an opening 180 that is formed in the cylinder part to flow digestive juice, which is secreted within the organism, into the through-hole and a guide part 190 for guiding the digestive juice to the opening.COPYRIGHT: (C)2015,JPO&INPIT【課題】糖尿病や肥満治療に有効なバイパス術に用いられる消化管用デバイスであって、下痢やダンピングの発症を好適に防止することができる消化管用デバイスを提供することを目的とする。【解決手段】消化管用デバイス100は、貫通孔111を備える筒部110と、筒部の基端側に設けられ、筒部を生体内に留置する留置部120と、筒部に形成され、生体内で分泌された消化液を貫通孔に流入させる開口部180と、開口部へ消化液を案内する案内部190と、を有する。【選択図】図1