| 摘要 |
An exchangeable prefilled syringe (4) is arranged in the front part (2) of the device. In the rear part (1), a gear mechanism (3) is arranged, the drive member of which is a driving sleeve (10) provided with a manipulating head (11), and the driven member of which is a threaded rod (12) mounted non-rotationally but longitudinally displaceably in the driving sleeve. The threaded rod (12) is seated in the female thread (22) of a gear element (20) which can be advanced, by exerting pressure on the manipulating head (11) in the axial longitudinal direction from a rest position into an end position against the force of a spring (26). In the rest position of the gear element (20), the threaded rod (12), located at a distance from the plunger (5) of the prefilled syringe (4), is threaded, by rotating the manipulating head (11), through the female thread (22) of the gear element (20) in correspondence with a plunger path required for the amount of liquid to be respectively injected, without the threaded rod (12) abutting against the plunger (5) during this step. Thereafter, the needle (7) is inserted, and the gear element (20) is advanced, by exerting pressure on the manipulating head (11), from the rest position into the end position. During the advancing stroke (h), the threaded rod (12) abuts against the plunger (5) and advances the latter in correspondence with the preselected plunger path. The device makes it possible to preselect an arbitrary amount of liquid by a corresponding rotation of the manipulating head (11) and to inject this amount of liquid, after insertion of the needle, by means of a single pressure exertion on the head (11).
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