Safety syringe

Abstract

Disclosed is a safety syringe that comprises a needle sleeve (), a needle base () and a core rod (). First claws () on the needle base () are configured to clamp in a first groove () on an inner wall of the needle sleeve (), one of a proximal end of the needle base () and a distal end of the core rod () is provided with second claws (), and the other one thereof is provided with a position-limiting member; the second claws () are configured to abut against the position-limiting member along a slanted surface. When the core rod () slides towards a distal side to perform injection, the second claws () are forced to slide along the slanted surface to pass over the position-limiting member and become hooked onto the position-limiting member, thereby realizing interlocking of the needle base () and the core rod (), and during this process, the core rod () slides to drive the first claws () to slip out of the first groove (); or when the core rod () retracts, the core rod () exerts a pulling force on the needle base () towards the proximal side so as to force the first claws () to slip out of the first groove (); the needle base () slides towards the proximal side together with the core rod (), thereby simplifying the structure of the safety syringe.