| 摘要 |
An injection device houses a syringe (4) and contains a drive spring (9), to urge the syringe (4) forwards to project its needle (6) and then eject the dose, and a return spring (14), to push the syringe (4) back into the housing (1, 2) and retract the needle (6). A trigger (12) is operated in one way to release the drive spring (9) and in another way to release the return spring (14), these operations being mutually exclusive and there being means (11, 24) for ensuring they are performed in the correct order.
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