Problem to be solved: to provide an anastomotic surgical device introduction device capable of sufficiently sealing air tightness and securing the airtightness even when the outer tube is placed outside the anus.A transanal surgical instrument introduction device 1 includesAn outer tube 7 to which inner tube 10 is mounted inwardAn inner annular member 15 and an outer annular member 16 which are fixed on both sides of the tubular opening member 14 and arranged inside and outside of the anus, respectively.An opening 4 is attached to the anus 3 and holds the anus 3 in an open stateAn opening side portion 18 having a proximal annular member 18 and a distal annular member 19 fixed to an opening at both sides of the cylindrical extension member 17, andThe joint part 5 is hermetically joined with the opening 4 and the opening extension partA reducer 8 is attached to the distal side annular member 19 to connect the outer tube 7 airtightly to the opening extension portion 6.Diagram【課題】アウターチューブを肛門部よりも体外側に配置した場合でも十分に気腹を行ってその気密性を確保できる経肛門手術具導入装置を提供する。【解決手段】経肛門手術具導入装置１は、インナーチューブ１０が内側に取り付けられるアウターチューブ７と、筒状開口部材１４の両側に固定されて肛門部の内側及び外側にそれぞれ配置される内側環状部材１５及び外側環状部材１６を有し、肛門部３に装着されて肛門部３を開口状態に保持する開口器４と、筒状延長部材１７の両側の開口部にそれぞれ固定された近位側環状部材１８及び遠位側環状部材１９を有する開口延長部６と、開口器４と開口延長部６とを気密に接合する接合部５と、遠位側環状部材１９に取り付けられてアウターチューブ７を開口延長部６に気密に接続するリデューサ８とを備える。【選択図】図１
