< Topic >Holding down the part to the smallest number, it pulls the injection needle securely and it is possible, to be packed, it offers the injector which cannot be utilized in the repetition.SolutionsHierarchical structure 21 to be provided in the toe of switch 20 inside, hierarchical structure 21 cone circular sulcus 22 and person in charge stopping circular sulcus to have 24 and annular projection 26, cone circular sulcus 22 and person in charge stopping circular sulcus 24 to display hierarchical, annular projection 26 the injection cylinder to be attached by the toe of switch 20 inside 2 which has been extended from the sill of cone circular sulcus 22 and the injection cylinder, around that, annular conical section 32 and person in charge lock part 34 to be consecutively provided from the bottom edge to the top, as for annular conical section 32 in cone circular sulcus 22It corresponds, person in charge lock part 34 corresponds to person in charge stopping circular sulcus 24, the bottom edge in annular projection 26 the person in charge movement possibly is stored inside the adapter and the injection cylinder which are stopped, that toe of switch 50 includes, moving to the bottom edge of the adapter, pushing, the plunger 5 which it concatenates with the bottom edge of the adapter and.< Choice figure >Drawing 2【課題】部品を最小数に抑えても、注射針を確実に引き込むことが可能であり、重複に利用できない注射器を提供する。【解決手段】内部の前端20に階段状構造21が設けられており、階段状構造21は円錐形環状溝22と係止環状溝24と環状突起26とを有し、円錐形環状溝22と係止環状溝24は階段状を呈し、環状突起26は円錐形環状溝22の下縁から突出している注射筒2と、注射筒の内部の前端20に組み付けられており、その周囲にはその底端から上端へ、環状円錐部32と係止部34とが順次に設けられており、環状円錐部32は円錐形環状溝22に対応し、係止部34は係止環状溝24に対応しており、底端は環状突起26に係止されているアダプターと、注射筒の内部に移動可能に収容され、その前端50は、アダプターの底端に移動して押付けて、アダプターの底端と連結する押子5と、を含む。【選択図】図2
