| 摘要 |
A safety syringe includes: a plunger slidably held in a syringe cylinder having a flexible coupling rod normally longitudinally formed at a central portion of the plunger, and a needle device detachably secured in a front portion of the syringe cylinder having a tilting hole inclinedly formed in a rear portion of the needle device, whereby upon finishing the injection of the syringe by engaging the flexible coupling rod with the tilting hole to couple the used needle device with the plunger, and upon a rearward retraction of the plunger with the coupled needle device into the syringe cylinder, the flexible coupling rod will automatically resiliently restore to inclinedly bias the coupled needle device within the cylinder to prevent outward protruding of the used needle device for safety protection.
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