The invention relates to a single-use injector comprising a housing (10), arranged inwhich are at least one mechanical spring energy store (50), at least one piston-cylinder unit(100), which can be effectively filled at least for a certain time, at least onepiston-actuating stem (60) and at least one triggering unit (80). The spring energystore comprises at least one pretensioned spring element. The spring-loaded piston-actuatingstem has at least one draw rod, which can be moved transversely, at least in certainregions, and by means of a supporting portion supports the tensioned spring energystore on at least one resting surface of the housing. When actuation occurs,the triggering element releases the supporting portion to allow it to move awayfrom the resting surface.
