Disposable injector with a flexurally elastic piston-actuating ram

摘要

A disposable injector with a cylinder/piston unit that can be filled at least temporarily with active substance, with a housing in which a pretensioned and releasable mechanical spring energy reservoir is arranged, and with at least one piston-actuating ram positioned between the spring energy reservoir and the piston of the cylinder/piston unit. The piston-actuating ram has two draw hooks that engage around the housing in some areas. In addition, the piston-actuating ram is separable from the housing by the relaxing spring energy reservoir. With the present invention, a disposable injector is developed which, with a small overall size, comprises only a small number of components and, while being easy to handle, ensures safe storage and operation.

主权项

1. A disposable injector (4) including a cylinder/piston unit (100) including a cylinder (101) that can be filled at least temporarily with active substance in operative arrangement with a piston (111), an inner housing (200) in which a pretensioned and releasable helical compression spring (50) is arranged, and a piston-actuating rain (60) in operative arrangement with the helical compression spring (50) and the piston (111) of the cylinder/piston unit (100), an improvement of the disposable injector (4) comprises:
the piston-actuating rain (60) is U-shaped and consists of a middle rain plate (73) and two flexurally elastic draw hooks (78) oppositely disposed on opposite sides of the middle rain plate (73) that extend upwardly from the middle rain plate (73) and externally of the helical compression spring (50), each of the draw hooks (78) having at an end thereof an angled collar hook (79), each of the angled collar hooks (79) extends inwardly towards a centre line (5) of the disposable injector (4) in operative engagement with an end plate (210) of the inner housing (200) in some areas prior to actuation of the disposable injector (4), the end plate (210) has no bores or apertures passing through the center thereof, the helical compression spring (50) operatively disposed between the two flexurally elastic draw hooks (78) and above the middle rain plate (73) and below the end plate (210), the piston-actuating rain (60) is separable from the inner housing (200) by means of releasing the helical compression spring (50), and both the inner housing (200) and also the piston-actuating rain (60) are thin-walled sheet-metal parts.