EINWEG-INJEKTOR

A disposal injector capable of preventing an injector mix-up accident from occurring by filling chemicals therein beforehand and being capable of being easily and safely disposed off by storing an injector needle after use in a piston so as not to be reused, comprising an injector body having an injector needle mounting part formed at one end of a tubular body part and an opening part for accepting the piston formed at the other end, the injector needle mounted on the injection needle mounting part, and the piston inserted into the opening part, the tubular body part further comprising a means for restricting the movement of the piston formed by filling the chemicals therein beforehand and closing the chemicals by the piston, wherein the piston movements restriction means is formed by covering the piston rod of the piston with a bellows formed of the peripheral surface parts with flat surfaces of a specified width and bottom parts alternately continued with each other and a fixing sheet is adhered to the peripheral surface of the bellows.