Hypodermic needle with protection device

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

Patent

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Details

604110, 604263, A61M 532

Patent

active

055541313

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a hypodermic needle with a device for protecting against the risks of infection.
2. Description of the Related Art
It is known that the presently used hypodermic needles for sanitary use have not substantially changed compared with the commonly known type.
As a matter of fact some attempts have been carried out in order to prevent the needle from infecting a handler after the use of the hypodermic needle, but in practice they did not get the success they perhaps deserved, so that things are still in the well known initial state.
The only true realty is that at present in almost all cases disposable syringes and needles are used, i.e. adapted for just one use and properly protected before their using by suitably sterilised packagings, but not protected after use.


SUMMARY OF THE INVENTION

An object of the present invention is to overcome this drawback by providing a hypodermic needle which is easy and practical to be used and nevertheless equipped with an effective device for the protection against infection.
The protection device substantially comprises a cap or a hollow member having a cylindrical or truncated cone shape, with piercing-resistant walls having an inner irregular profile snap-secured to a base supporting the needle, and provided at its base with a resilient element formed like a coil or sheath with a marked propelling capability, and at the other end with a preferably eccentric hole.
Within the cap cavity there is provided a pocket, outwardly defined by the cap walls and inwardly by a pierceable metal foil, with such pocket containing an adhesive and air-hardening material, in case supported by a resilient spongy material.
Said adhesive and hardening material is to be understood as comprising a physical-chemical composition adapted to envelop the portion of the needle stuck thereinto after use, which occludes the hole and sets very quickly, so as to render the hypodermic needle no longer separable from the protection cap.
Said snap engagement of the cap to the needle supporting base provides three main different embodiments of the invention: a first manually operated one; a second which is semi-automatic; and a third one which is a fully automatic and actually preferred embodiment.
According to the first embodiment, the cap is locked onto the needle base by a series of cooperating snap retainers located on the inner wall of the cap and on the outer wall of the needle base mating the cap: a short manually imparted displacement of the cap causes the cap to be released from the base, and allows it to spring upward to wholly shelter the needle. It is to be understood that said displacement can even be imparted with the needle still inserted in the skin, so that the cap is released and springs forward to shelter the exposed portion of the needle 9, and remains ready to wholly cover it, as soon as it will be extracted from the skin.
According to the second embodiment, the cap is retained by the needle base through a series of retainers provided with an inclined surface: the pressure applied by the skin to the needle cap while pricking lowers said cap with respect to its mating base, causing said locks to slide along said inclined surfaces, so that the cap is rotated with respect to the base and it is disengaged from said base. In said case, the sheltering of the needle by the cap is ensured after the prick has been executed.
According to the third and actually preferred embodiment of the invention, the cap is linked to the base of the needle by a lever device, pivotally secured to the wall of the base and cooperating with a recess in the wall of the cap; as soon as the needle is inserted into the skin, the fluid displaced by the syringe piston acts upon said lever element and causes it to rotate enough to disengage it from the recess provided in the cap, thus allowing the action of the cap propelling means.


BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be now described with details with part

REFERENCES:
patent: 4725267 (1988-02-01), Vaillancourt
patent: 4728321 (1988-03-01), Chen
patent: 5232454 (1993-08-01), Hollister
patent: 5232455 (1993-08-01), Hollister

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