| 摘要 |
Prepackaged, disposable hypodermic syringes having a double-ended hypodermic needle comprising a cartridge ampoule and a syringe holder, as well as the syringe holders per se, are provided with restraint means to prevent accidental engagement between the hypodermic needle and the cartridge ampoule and consequent premature discharge of the ampoule contents prior to intended use.
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