Self-locking safety disposable syringe with needle protection after use

摘要

The invention refers to the field of self-locking safety disposable syringes with needle protection after use. The syringe comprises a hollow barrel ( 1 ) ending on its lower side with an internal seat ( 2 ) adapted to receive a hub ( 3 ) carrying a cannula ( 4 ). A hollow driving rod ( 5 ) adapted to house a spring ( 6 ) is inserted in the hollow barrel. Such rod is closed at its lower end by an extracting element ( 8 ) that can slide into the hollow driving rod. The extracting element has an annular notch ( 9 ) in which a sealing ring rubber gasket ( 10 ) is housed that seals the internal wall of the hollow barrel ( 1 ). The extracting element ( 8 ) with related sealing ring gasket ( 10 ) form a liquid sucking and compressing plunger.