Automatically blocked safety syringe

Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...

Patent

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Details

604195, A61M 500

Patent

active

052058263

ABSTRACT:
A syringe includes a hollow needle preliminarily held in a rigid blocking disk embedded in a rear disk socket perpendicularly formed in a flexible plug inserted in a front portion of the syringe for injection use having a needle head portion formed on a rear portion of the needle, and a plunger slidably held in the syringe for boosting a liquid medicine in the syringe to be injected into a patient through the hollow needle having a needle-head socket recessed in the plunger to be engageable with the needle-head socket for pushing the needle head portion of the needle frontwardly to drive the rigid blocking disk frontwardly to engage the blocking disk into a front disk socket which is normally inclinedly formed in the flexible plug and will be operatively perpendicularly biased in the plug when approximately exhausting the liquid in the syringe and finishing the injection, whereby upon a retraction of the plunger and the needle with the needle head portion received in and coupled to the plunger into the syringe to disengage the needle from the rigid disk, the flexible plug will restore the front socket and the rigid disk embedded in the front socket to be inclinedly positioned in the plug, thereby blocking an outward protruding of the needle retracted in the syringe for preventing its injury or infectious contamination to the surroundings.

REFERENCES:
patent: 4804370 (1989-02-01), Haber et al.
patent: 5104378 (1992-04-01), Haber et al.

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