| 摘要 |
<p>A medical safety syringe includes a needle assembly, a syringe assembly, a needle tip cutting edge limiting and positioning structure and an automatic retraction and protection structure of the needle. The automatic retraction and protection structure of the needle includes a latch (7) and a spring (6). The tip end of one end of the spring (6) extends outwards, which can stop the latch (7) and prevent the needle tip from escaping and protruding. The needle assembly includes an inner needle base (4) and an external needle base (1). The front half portion of the inner needle base (4) is configured with a square-shaped body (4c), the front end of the external needle base (1) is provided with a square-shaped hole (1a), and the square-shaped body (4c) and the square-shaped hole (1a) form the needle tip cutting edge limiting and positioning structure, which facilitates to position a needle tip cutting edge (2a) and the inner needle base (4) uniformly.</p> |
