Self-destructing syringe with high level of safety and convenient assembly

摘要

Disclosed is a self-destructing syringe, comprising an outer casing, a core bar, a piston, a conical head component, a syringe needle and a protecting jacket. The syringe needle is fixed in the conical head component, and the conical head component consists of a threaded conical head, a sealing ring, a transition part and a hollow wedge. The protecting jacket is put around the syringe needle and is movably connected to the needle base of the syringe needle; the conical head component is fixed in the inner cavity at the front end of the outer casing; the piston is installed on the core bar; the main part of the core bar is sheathed inside the outer casing; and the front end of the core bar is inserted into the conical head component and is able to make the syringe needle return inside the outer casing.

主权项

1. A self-destructive syringe, comprising:
a barrel; a plunger; a piston; a conical connector assembly; a syringe needle; and a protective cap; wherein:
the syringe needle has a needle seat which is mounted in the conical connector assembly;the protective cap is mounted above the syringe needle to cover the syringe needle and is movably connected to the needle seat of the syringe needle;the conical connector assembly is mounted in an inner cavity of a front end of the barrel;the piston is mounted at a front end of the plunger;a main body portion of the plunger is mounted in the barrel;the front end of the plunger is configured to insert into the conical connector assembly during an injection operation and drive the syringe needle mounted on the conical connector assembly to retract into the barrel;the conical connector assembly comprises:
a thread conical connector having an upper portion engaged with the needle seat of the syringe needle;a sealing ring;a transition part; anda hollow wedge;wherein:
a lower portion of the thread conical connector is configured to be inserted into an annular groove and an annular recess of the transition part;the sealing ring is press fitted among joint surfaces of the thread conical connector, the transition part and an inner cavity wall surface of the front end of the barrel, andthe hollow wedge is insertedly mounted in the transition part and has two annular inclined steps configured to expand spaced blades at a lower part of the transition part, to locate the conical connector assembly in the inner cavity of the front end of the barrel.