Patent ID: 8535263

Claim:
In combination with a single-use injector having a housing ( 200 ), in which or on which there are arranged—in each case at least in some areas—at least one mechanical spring energy store ( 50 ), at least one cylinder-piston unit ( 100 )—that can be filled at least temporarily with active substance—, at least one piston-actuating ram ( 60 ) and at least one triggering unit ( 80 ), the piston-actuating ram ( 60 ) is positioned between the spring energy store ( 50 ) and the piston ( 111 ) of the piston-cylinder unit ( 100 ), the spring energy store comprises at least one pretensioned spring element ( 50 ), the piston ( 111 ) of the cylinder-piston unit ( 100 ) can be separately moved by means of a pump rod ( 140 )—when the spring element ( 50 ) is pretensioned, the pump rod ( 140 ) can be releasably coupled to the piston ( 111 ) or to a piston rod of the piston ( 111 ), the spring-loaded piston-actuating ram ( 60 ) is supported by way of housing-side supporting portions ( 231 , 241 , 251 ) and the contact zone situated between the individual supporting portions ( 231 , 241 , 251 ) and the piston-actuating ram ( 60 ) represents part of an outwardly forcing wedge gear pairing, the improvement which comprises: the housing ( 200 ) is composed of a thin-walled sheet-metal part ( 201 , 202 ) the sheet-metal part ( 201 , 202 ) has at least two branches ( 220 , 250 ), the at least two branches ( 220 ) each have at the free ends an angled retaining element ( 221 ) or a recess—as a means of receiving the cylinder ( 101 ) of the cylinder-piston unit ( 100 ) and the sheet-metal part ( 201 , 202 ) that is elastic at least in some areas has at least two pressure rods ( 240 ) or at least two tension hooks ( 250 ), the free ends of which are each bent at an angle to form a supporting portion ( 241 , 251 ) for the piston-actuating ram ( 60 ), or the sheet-metal part ( 201 ) has as branches ( 220 ) elastic flexural beams, which are each bent away in the shape of a z or an s in the middle area to form a supporting portion ( 231 ) for the piston-actuating ram ( 60 ).