Patent ID: 8147450

Claim:
A disposable self-destruction safety syringe without fluid residua, comprising a syringe tube, a push rod, a needle mount and a needle, wherein the needle is mounted on the needle mount and in fluid communication with a chamber of the needle mount, the needle mount and the push rod are mounted in the syringe tube, and a plunger slidably fitting with an inside wall of the syringe tube is further provided on a front end of the push rod, wherein an automatic retraction means is mounted at a front end of a chamber of the push rod, the automatic retraction means comprises a retraction rod, a compression spring fit around the retraction rod, an elastic rubber washer mounted on a terminal end of the retraction rod and a position-limiting ring provided on an inside wall of the push rod, wherein the elastic rubber washer is engaged with the position-limiting ring so as to form an interference fit with each other to securely locate the automatic retraction means at the front end of the chamber of the push rod, and the retraction rod of the automatic retraction means and the needle mount are each provided with a respective snap-latch member, the two snap-latch members are engaged with each other so as to form an interference fit for connecting the needle mount with the automatic retraction means, wherein each of the snap-latch members is provided with a fluid pass channel, the fluid pass channels are formed to be in fluid communication with the chamber of the syringe tube and the needle mount when the two snap-latch members engage with each other to form interference fit so that fluid remaining inside the syringe tube flows through the fluid pass channels into the chamber of the needle mount and into the needle, so as to be injected into the human body.