| 摘要 |
Auto-injector for administering a dose of a liquid medicament comprising
- a cylindrical chassis arranged to contain a pre-filled syringe with a syringe barrel, an injection needle and a stopper for sealing the syringe barrel,
- a needle shroud slidably arranged within the chassis and adapted to rest on the skin of a patient receiving an injection,
- a plunger adapted to translate the stopper to expel the dose of the medicament through the injection needle,
- a coupling shroud slidably arranged within the chassis and releasably coupled to the plunger and
- a drive means. Upon release, the drive means is capable of driving the coupling shroud from a first position in a proximal direction. The proximal translatory movement of the coupling shroud with respect to the chassis
- translates the pre-filled syringe in the proximal direction to expose the injection needle,
- depresses the plunger connected to the stopper into the syringe barrel and
- advances the needle shroud to a safe position to surround the injection needle after the injection. The coupling shroud is arranged to be decoupled from the plunger at a second position. |
