Patent ID: 6743203
Filing Date: 2004-06-01
Classification: A61M

Abstract:
A device for automatically injecting injection liquids, including an axially subdivided housing whose parts are detachably connectable, wherein an axially displaceable pressure pin is guided in a first housing part, which pin is capable of being inserted against a force accumulator and locked in the inserted position and extended upon relief of said force accumulator, and wherein an injection needle fitted within a needle guide and an ampoule are mounted in a second housing part in an axially displaceable manner, wherein the injection needle (4) is mounted so as to be displaceable in the axial direction relative to the ampoule (3) and, on its side facing the ampoule (3), is designed as a perforation piece (23) for the ampoule (3), characterized in that a helical spring (7) is arranged in the interior of the second housing part (1) between the housing end, including the passage opening for the injection needle (4) and the needle guide (5), that the needle guide (5), on its jacket, comprises at least one inwardly salient, axially resilient abutment piece (19) for the ampoule (3) and the needle guide (5), on its jacket, comprises at least one outwardly salient resilient abutment piece (20) which cooperates with an appropriate stop (21) of the second housing part, and that the second housing part (1), on its open end facing the first housing part (13), carries a thread or a bayonet capable of being screwed or latched with a counter-thread (10) or counter-bayonet, respectively, of the first housing part (13), or a sealing cap (11).