| 摘要 |
A single use syringe (10) has a needle (14) which is biased back into the barrel (11) but which is prevented from doing so by a holding means (26) which has an outer part (25) and an inner part (27) which are connected together by a frangible portion (29). The needle (14) is held by the inner part (27). When the plunger (13) is pushed towards the front of the barrel (11), it contacts the outer part (25) and pushes it forwardly which stretches the frangible portion (29) until it bursts. When the frangible portion (29) breaks, the inner portion (27) containing the needle (14) is released and can shoot back into a hollow portion (15) in the plunger (13) through a frangible portion of the plunger head (12).
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