| 摘要 |
A disposable safety syringe consists of a needle, a connecting part, a barrel and a piston. The connecting part is inserted inside an inner tube of the barrel so as to prevent solution therein from leaking. The needle is disposed on a tubular bearing on front surface of the connecting part. The piston is removable-being pushed forwards and pulled backwards. By pushing the piston forwards, the solution passes the connecting part and the needle to be injected into a patient. The device is featured on that a pivotal piece with certain thickness is integrated and connected with a rear-end surface of the connecting part by a connecting piece. The connecting piece acts as a pivot. A round insertion hole with certain diameter is arranged on the center of the pivotal piece. A projecting post having a conic head with a hook on top side thereof, corresponding to the insertion hole, is disposed on a front-end surface of the piston. After finishing injection, the piston is pushed continuously so as to make the conic head insert through the insertion hole of the pivotal piece and hook with the pivotal piece. Thus when pulled the piston backwards, the connecting part is moved by the pivotal piece on one side and both the connecting part and the needle retracts into the barrel and are inclined so as to achieve safety use of the syringe.
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