Patent ID: 7611491

Claim:
A device for automatically injecting injection liquids, comprising an axially subdivided housing comprising at least two parts which are connectable with each other, wherein an axially displaceable pressure pin ( 5 ) is guided in a first housing part ( 2 ), which pin is capable of being inserted against a force accumulator ( 6 ) and locked in the inserted position and extended upon relief of the force accumulator ( 6 ), and an injection needle ( 15 ) fixed in a needle guide ( 14 ) and an ampoule ( 13 ) are mounted in a second housing part ( 3 ) so as to be axially displaceable relative to each other, wherein the injection needle ( 15 ) on its side facing the ampoule ( 13 ) is designed as a perforation piece for the ampoule ( 13 ), wherein the ampoule ( 13 ) with its end facing the injection needle ( 15 ) is mounted to reach into a sleeve ( 16 ) fixed within the second housing part ( 3 ), said sleeve ( 16 ) having an inner diameter that substantially corresponds to an outer diameter of the ampoule ( 13 ), radially inwardly protruding projections ( 17 ) are formed on an inner periphery of the sleeve ( 16 ), and the sleeve ( 16 ) comprises locking members cooperating with locking members ( 20 ) of the needle guide ( 14 ), whereby an axial displacement of the ampoule ( 13 ) in a direction toward the needle guide ( 14 ) while overcoming displacement resistance exerted by the projections ( 17 ) causes release of the locking members ( 20 ) and axial displaceability of the needle guide ( 14 ).