| 摘要 |
<p>An injection device holds a syringe in the form of a capsule (4, 35) having a needle (5, 36) projecting from its forward end and a plunger (15, 34) extending from its rear end. The rear end (3, 53) of the plunger is received in a drive member (8, 32) which, when released, is urged forwards by a coil spring (12; 66, 69), this projecting the needle (5, 36) and then expressing the dose. The drive member (8, 32) is held captive in its rearward primed position by a detent (6, 59) provided by the body (1, 31) of the device. A sleeve (2, 61) covering a substantial part of the body (1, 31) can shift longitudinally of it from an initial rearward position to a forward position in which it either disengages the drive member (8) from the detent (6) or in which a trigger (55) is freed for actuation to release the drive member (32). Initially the drive member (8, 32) and the coil spring (12; 66, 69) are telescoped together, with the spring acting against the rear end (3, 53) of the body (1, 31) and the drive member (8, 32) being held at its forward end.</p> |
