| 摘要 |
An injection device 100 for injection of an accurate dose of medicament contains a pre-filled syringe 10 with a stopper 22 for expelling medicament. A housing 110 contains the syringe, a plunger 142 for driving the stopper, and a priming mechanism having an operating member 152 which is movable with respect to the housing. The priming mechanism is arranged to move the syringe towards the plunger upon movement of the operating member, so that the stopper comes into contact with the plunger. Upon firing, the plunger moves a predetermined distance and so dispenses a known quantity of medicament. Rotation of the operating member causes a shuttle 170 to be axially displaced so it presses on the shoulder of the syringe barrel. A needle shield 30 is restrained and so this movement breaks the seal between the needle and the inner boot 32. Preferably, priming is driven by removing a cap from the injector. |
