| 摘要 |
A hypodermic syringe comprising a pump body, a plunger slidingly mounted in the pump body and a hollow needle for discharging fluid expelled from the pump body by the plunger. The syringe also comprises a first lock to detachably secure the needle to the pump body and a second lock to secure the needle to the plunger for completely drawing the needle into the pump body when the needle is detached from the pump body.
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