PROBLEM TO BE SOLVED: To provide a flow path sealing member capable of securing the large flow path of a step part when a part of the flow path sealing member is abutted to the annular step part inside a tube after fracture.SOLUTION: In the flow path sealing member 1 comprising a cylindrical fixed base part 2 fixed to the inner surface of the tube and opened at both ends, a blocking part 3 forming a gap with the tube and blocking the opening end on the downstream side of the fixed base part 2, and a fracture part 4 formed between the fixed base part 2 and the blocking part 3, the blocking part 3 includes a main body 5, a groove 6 formed on the surface of the main body 5 along the axial direction of the main body 5, and a pair of projection bodies 7 formed so as to be projected to the radial direction outer side more than the main body 5 on both sides of the downstream end of the groove 6.COPYRIGHT: (C)2009,JPO&INPIT【課題】破断後、流路封止部材の一部がチューブ内の環状の段差部に突き当たったとき、段差部の流路を大きく確保できる流路封止部材を提供する。【解決手段】チューブの内面に固定され、両端が開口形成された筒状の固定基部2と、チューブと隙間を形成し、固定基部2の下流側の開口端を閉塞する閉塞部3と、固定基部2と閉塞部3との間に形成される破断部4と、を備えた流路封止部材1において、閉塞部3が、本体5と、本体5の表面に本体5の軸方向に沿って形成される溝6と、溝6の下流端両側において、本体5よりも径方向外側に突出するように形成される一対の突出体7と、を備える構成とした。【選択図】図3
