Novel injector

The utility model relates to a novel injector belongs to the relevant technical field of medical instrument. Mainly include: including needle cap, syringe needle, barrel and piston. The needle cap includes the cap body, and the cap body is hollow cylindrical structure, the top of the cap body is the enclosed construction, and the bottom is open structure, the lateral part of the cap body has firstlogical groove, the inner wall of the cap body passes through connecting plate and sleeve pipe fixed connection, the sheathed tube top is the enclosed construction, and the bottom is open structure,the sheathed tube lateral part has the second and leads to the groove, be provided with the cowl who is used for sealing first logical groove between the sleeve pipe and the cap body, cowl's one sideand straight baffle fixed connection, cowl's opposite side and elastomeric element's one end fixed connection, elastomeric element's the other end and connecting plate fixed connection, straight baffle protrusion in the cap bod