| 摘要 |
<p>A pneumatic retractable self-destructing syringe comprises a barrel (4), a hollow plunger (3), a needle hub (5), a sealing ring (6), a piston (8) and a seal joint (7). Matching connection structures are respectively arranged on the seal joint (7) and the needle hub (5); the forward-end inner wall of the barrel (4) and the forward-end outer wall of the needle hub (5) are hermetically sealed; stop devices (31) are arranged on the plunger (3) inner wall; an air-exhaust hole (33) is provided at the bottom end of the plunger (3). The present invention is structurally simple, easy and inexpensive to manufacture, and easily assembled. Self-destruction is divided into two steps; first, the seal joint (7) is inserted in the needle hub (5) inner hole by means of manual force, the seal joint loosens when the injection liquid is completely injected, as the sealing ring (6) continues to be pushed forward, air pressure is generated, then the seal joint (7) is ejected into the plunger by the release of the energy of the compressed air. The lower precision requirements of the product allow for simpler and more reliable self-destruction.</p> |
