| 摘要 |
An auto-injector (1) for administering a dose of a liquid medicament (M) is disclosed. It is an object of the present invention to provide an improved auto-injector. One trigger button causes the injection to activate and then retract automatically after administering the medicament. The auto-injector comprising an elongate case (12) arranged to be held by a user with a tubular chassis (2) telescoped in the case (12) and biased against the case (12) so as to protrude from it. Additionally a syringe (3) with a hollow injection needle (4), a drive spring (8) and a plunger (9) for forwarding load of the drive spring (8) to a stopper (6) of the syringe (3) is contained within the case. A trigger button (13), distally arranged in or on the case (12), is initially coupled to the case (12) so as to protrude distally from the case (12) and interlocked to the chassis (2) in a manner preventing the trigger button (13) from disengaging the case (12) and thus preventing actuation of the trigger button (13) in an initial position. The case (12) is also arranged to translate in the proximal direction (P) against the bias relative to the chassis (2) when the chassis (2) is pressed against an injection site thereby also translating the trigger button (13) releasing the interlock to the chassis (2) so as to allow actuation of the trigger button (13). The trigger button (13) is arranged to lock in a more proximal position on actuation. |
