Patent ID: 8092419

Claim:
A disposable injector comprising: a housing ( 10 ), in which or on which respectively at least in certain areas at least one mechanical spring-energy storage ( 50 ), at least one cylinder-piston unit ( 100 ) which can be filled at least occasionally with active ingredient, at least one piston-actuating plunger ( 60 ) and at least one actuating unit ( 80 ) are arranged, at least one piston-actuating plunger ( 60 ) is positioned between the spring-energy storage ( 50 ) and a piston ( 111 ) of the cylinder-piston unit ( 100 ), at least one spring-energy storage ( 50 ) includes at least one pre-stressed spring-loaded element, the at least one spring-loaded piston-actuating plunger ( 60 ) has a plunger disc ( 73 ) for supporting the spring-energy storage ( 50 ) the at least one spring-loaded piston-actuating plunger ( 60 ) on the plunger disc ( 73 ) is supported on the housing ( 10 ) via at least one support rod ( 21 ), the at least one support rod ( 21 ) is formed respectively on the housing ( 10 ) being affixed at only one end thereof and the at least one support rod ( 21 ) being an elastic flexional beam ( 28 ), the at least one support rod ( 21 ) includes a cam ( 22 ) at the free end of the rod ( 21 ), each of the at least one individual support rods ( 21 ) forms a wedge gear combination with the plunger disc ( 73 ) at a contact zone, the wedge gear combination operatively exerts force on the respective support rod ( 21 ) in a radially outward direction, the piston-actuating plunger ( 60 ) has on its front end averted from the spring-loaded element ( 50 ) at least in certain areas flat wedged faces or in certain areas single frustoconical faces ( 74 , 75 ), the actuating unit ( 80 ) includes at least one actuating element ( 82 ) with the at least one actuating element ( 82 ) mounted on the housing ( 10 ), the at least one support rod ( 21 ) in operational arrangement with the at least one actuating element ( 82 ), in a locked engagement position ( 8 ) the at least one support rod ( 21 ) bears on, and forces radially outwards the at least one actuating element ( 82 ), the actuating element ( 82 ) is a slide sleeve mounted slidably on the outside of the housing ( 10 ), the actuating unit ( 80 ) further includes a securing actuating lever ( 86 ) fastened to or formed integrally with the actuating element ( 82 ) or the actuating unit ( 80 ) further includes a retaining ring ( 97 ) mounted in operative position with the housing ( 10 ) proximate the slide sleeve actuating element ( 82 ), whereby the actuating element ( 82 ), as part of the at least one actuating unit ( 80 ), can be brought by displacement into an actuating position ( 9 ) that releases the piston-actuating plunger ( 60 ) and has no supporting action.