| 摘要 |
A safety syringe includes two major components; a barrel and a plunger; a needle hub engaged with the barrel and a plunger slid ably received in the barrel to engage with the needle hub and to retract the needle hub into the barrel. A V-shape groove formed a thin membrane surround the needle hub. The V-shape groove separates the needle hub and the barrel into two peripheries-an inner periphery of the barrel and an outer periphery of the hub. The inner periphery of the barrel and the outer periphery of the hub are thicker than the thin membrane. Multiple pyramidal blocks extended from the outer periphery of the hub facing outward to the barrel. Multiple triangular cutouts with V-shape groove edge defined in the inner periphery of the barrel respectively correspond to one of the multiple pyramidal blocks.
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