| 摘要 |
The invention relates to an automatic injection device (1) comprising a housing that is sub-divided in the axial direction, the parts of said housin g being interconnectable. An axially displaceable stud (5) is guided in a firs t part (2) of the housing, and an injection canula (15) blocked in a canula guiding mechanism (14) is mounted, with an ampule (13), in the second part ( 3) of the housing in such a way that they can be displaced in relation to each other. According to the invention, the injection canula (15) is embodied as a puncturing part (32) for the ampule (13), on the side thereof facing the ampule (13), and the end of the ampule (13) facing the injection canula (15) is plunged into a sleeve (16) blocked in the second part (3) of the housing, the inner diameter of the sleeve essentially corresponding to the outer diameter of the ampule (13). Radially inwardly protruding projections (17) a re formed on the inner circumference of the sleeve (16), and the sleeve (16) comprises locking elements which co-operate with locking elements (20) of th e canula guiding mechanism (14). An axial displacement of the ampule (13) in t he direction of the canula guiding mechanism (14), overcoming the displacement resistance exerted by the projections (17), causes the release of the lockin g elements (20) and the axial displaceability of the canula guiding mechanism (14). |
