Self-locking disposable safety syringe
OwnerChi-Hsuan Hsuinventor
Life of this patent
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Abstract
A self-locking disposable safety syringe includes a hollow barrel having a front open end, a rear open end and a flange formed on an inner face of the barrel, a plunger extendable into the barrel from the rear open end, a needle hub connecting assembly selectively movable in the barrel for securely engaging with a needle hub which is inserted into the barrel from the front end, the needle hub connecting assembly having an annular ring expandable in the barrel, and a press movably received in the barrel and securely connected to the needle hub connecting assembly to selectively expand the annular ring so as to position the needle hub connecting assembly in the barrel.
Claims13
A self-locking disposable safety syringe comprising:
- a hollow barrel having a front open end, a rear open end, a flange formed on an inner face of the barrel and a stop formed above the flange;
- a plunger extendable into the barrel from the rear open end;
- a needle hub connecting assembly stopped by the flange and selectively movable in the barrel for securely engaging with a needle hub which is inserted into the barrel from the front end, the needle hub connecting assembly having an annular ring expandable in the barrel so as to engage with the stop;
- and
- a press movably received in the barrel and securely connected to the needle hub connecting assembly to selectively expand the annular ring so as to position the needle hub connecting assembly in the barrel,
- whereby when the annular ring is expanded, the needle hub connecting assembly is fixed in the barrel and when expansion of the annular ring is released, the needle hub connecting assembly is able to be pulled backward into the barrel by the plunger with the assistance of the press.
Dependencies are inferred from the claim text.