Syringe with retractable needle

Details Syringe with retractable needle Syringe with retractable needle

1994-12-13

1996-01-30

Yasko, John D.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604195, 604218, A61M 500

Patent

active

054877326

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

This invention relates to hollow needle applicators suitable for administering cartridged drugs etc.
Dangers of infection and cross-infection, much high-lighted by the spread of AIDS, mean there is a need for hollow-needle devices as drug etc applicators with automatic retraction and designed for single use only, i.e. designedly not lending themselves to re-use. This is, perhaps, particularly the case for cartridged drugs etc supplied as a one-dose item complete with applicator. Indeed, there have been many proposals over the years for such applicators, especially recently, but most are of doubtful practicality or of complex and costly construction, even both. We have, ourselves, made basic proposals (PCT application GB92/00652) for practical and low-cost single use hypodermic syringes (and body-fluid samplers) with automatic needle retraction, including usable with cartridged drugs etc, but not particularly complete pre-loaded applicator devices, nor with self-powering provision also affording automatic needle extension before cartridge discharge and needle retraction.


SUMMARY OF THE INVENTION

It is a general object of this invention to make further proposals for pre-loaded drugs etc applicators also having potential for practical and low-cost implementation.
In using the term "drug etc" herein, there is no intention to limit application of this invention to drugs as such, even to antidote substances. This invention is seen as generally applicable to any usefully injectable substance; and to doing so into any appropriate receiver, I.e. whether or not that is tissue of a human or even animal subject.
Since filing U.K. Patent Applications from which priority is claimed for the present patent application, we have become aware of a European Patent Application published on 2nd Dec. 1992 under the serial number 0516473. The latter concerns a proposed self-powered cartridged drug etc applicator with automatic sequential needle extension, cartridge contents expression, and needle retraction. An outer body accommodates a drug etc cartridge with a hollow needle within one end of the outer body and extensible therethrough when retraction bias acting on an outwardly flared rearward mouth of the cartridge is overcome. Within the other end of the outer body is a piston actuator and associated power drive spring with a twist then press down arrangement for selectively releasing and power driving the piston actuator to overcome the retraction bias in causing needle extension and cartridge contents expression.
Coupling between the piston actuator and discharge piston of the cartridge is by a piston rod carrying the cartridge piston at one end, and (in the main embodiment) having slotting at its other end further provided with first outwardly extending projections preventing entry of the piston rod into a bore of the piston actuator. Spaced second outwardly extending projections can enter the cartridge at the end of contents expression with the intention of squeezing together the piston rod parts flanking the slotting to allow the slotted end of the piston rod to enter the piston actuator bore. Particular reliance is placed on providing two spaced internal ledgings of the outer body, which, together with specific spacer elements, serve to limit movement of the cartridge and the piston actuator.
Amongst perceived disadvantages of the applicator of EPA 0516473 is manifest requirement for its outer body to be fabricated from separately made components, at least in order to provide the required spaced internal ledgings. Also, illustrated piston rod slotting affords little leverage for the second outwardly extending projections in squeezing together the piston rod parts flanking the slotting; and there is clearly limited entry of a short portion only of the piston rod into the piston actuator bore, actually much less than the lengths of the slotting and the piston rod parts flanking the slotting. The latter effectively defines retraction thus exposable extent of the hollow needle, and further con

REFERENCES:
patent: 5019043 (1991-05-01), Pastor et al.
patent: 5092853 (1992-03-01), Couvertier, II
patent: 5120310 (1992-06-01), Shaw

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