The invention relates to a single-use injector and to a two-chamber system, wherein at least one first chamber is part of a cylinder-piston unit that can be received in the single-use injector, and wherein the second chamber is part of a container having at least one opening, and closed at least intermittently by means of a stopper and place in a container adapter releasably supported on the single-use injector. To this end, the stopper and the container adapter can be permanently latched to each other. When the container is inserted, the container adapter closes off the opening and displaces the stopper. When the container is inserted into the container adapter, the adapter connects the interior of the cylinder-piston unit to the interior of the container. By means of the present invention, a single-use injector and a two-chamber system having a reduced number of components is developed.
