| 摘要 |
A needle-retractable safety hypodermic syringe is disclosed to include a barrel, a needle assembly at the front end of the barrel, a plunger mounted with a stopper for expelling medicine out of the barrel through the needle assembly and pulling the needle assembly into the inside of the barrel after the service, a first retaining portion formed inside the rear end of the barrel, and a second retaining portion formed on a connector at the plunger for engaging the fist retaining portion to secure the needle assembly firmly inside the barrel after the service of the safety hypodermic syringe.
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