| 摘要 |
A driver sleeve (8) is pivoted in the casing (1) of the unit which is driven by a motor controlled by a control device and supplied by a battery. A threaded rod (11) forming the piston rod of an injection ampule (15) is placed into the driver sleeve (8) in a non-rotary but longitudinally shiftable fashion. A nut (21) provided with an external toothing (20) is rigidly held on the rear end of the injection ampule (15) in the casing (1). A connecting part (27) provided with a catheter (32) receives the outlet piece (30) of the injection ampule (15) and is screwed to the casing (1) so that the exchangeable injection ampule (15) is completely surrounded by the casing (1) and the connecting part (27) and the outlet piece (30), resting close to the connecting part (27), of the injection ampule (15) communicates with the catheter (32). The threaded rod (11) is placed into the piston (14) of the injection ampule (15) with the nut (21) being screwed on and is placed into the casing (1) together with the injection ampule (15). When the driver sleeve (8) is driven, it moves, with the advancing of the piston (14), through the nut (21) held tightly in the casing (1) adjacent to the rear end of the injection ampule. The unit guarantees a reliable advance of the piston rod even with a low torque of the driving device and has only a length as required by the injection ampule and the necessary piston rod length.
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