| 摘要 |
A syringe (1) comprises a barrel (2) for containing a substance to be injected, a needle carrier (12) for carrying a needle (10), and a plunger (3) which is adapted to be movable in the barrel 2 to expel the substance to be injected from the needle (10). The plunger (3) has a first part (3a), a second part (3b) and a resilient member (6) therebetween, the first (3a) and second (3b) parts being adapted to be releasably locked together to hold the resilient member (6) in a compressed state. In use, the first part 3a of the plunger (3) and the needle carrier (12) are adapted to engage one another following expulsion of the substance, and the second part (3b) of the plunger (3) is adapted to be unlocked from the first part (3a) following said engagement, allowing the resilient member (6) to expand to propel the needle carrier (12) into the barrel (2). |
