Plastic syringe

Details Plastic syringe Plastic syringe

1993-07-13

1995-12-26

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

604218, 604232, 604243, A61M 500

Patent

active

054783216

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

This invention relates to a disposable syringe intended for single use.
Since use disposable syringes for medical purposes are well known and are in everyday use. Such syringes are more convenient than re-usable syringes as there is no need for the medical practioner to maintain sterilising facilities for the various components used with re-usable syringes. A disposable syringe can be prepackaged in a sterile condition and thus be available for use immediately when required. This makes such syringes particularly useful when administration of any particular injectable is required in emergency situations.
With respect to particular injectable solutions, it is often desirable that the disposable syringe be pre-filled so that it is not necessary to transfer the injectable solution from a separate ampoule prior to use.
An example of a pre-filled disposable syringe is described in Austrailian patent application 11603/88 in the name of the Applicant. This syringe is sealed at one end (remote form the stopper) by an integral closure which is adapted to be removed so to thereby reveal a needle fitting for the connection of an appropriate hyperdermic syringe and the contents of the syringe for injection.
Whilst the syringe described in Australian patent application 11603/88 is, by and large, a significant improvement over prior prefilled disposable syringes (and these advantages are described therein) it does still present some inconvenience in operation. In particular, the syringe described in this earlier specification requires two distinct and separate operations by the user before the syringe is available for use, namely: needling fitting.


SUMMARY OF THE INVENTION

It is an object of the present invention to provide a disposable pre-filled syringe which is easy to use and which overcomes some of the shortcomings of earlier disposable syringe systems.
According to the present invention, there is provided a pre-filled disposable plastics syringe comprising an open ended barrel having a needle fitting disposed at one end and being sealed at the other end of the barrel by a movable stopper wherein said needle fitting end of the barrel is sealed by a frangible closure which is integral with the needle fitting, said closure being adapted to co-operate with a hyperdermic needle support shaped to fit onto said needle fitting such that application of a downward force on said hyperdermic needle support onto said needle fitting causes said closure to separate from the needle fitting and move at least some way into the body of the syringe and thereby reveal the contents of the syringe for injection.
Preferably, the closure is in the form of a stem having a diameter approximately equal to or smaller than the smallest internal diameter of the needle fitting. It will be apparent to those skilled in the art that the frangible connection of the closure to the needle fitting can be positioned in a number of convenient locations. In one embodiment, this connection is located at the very end of the needle fitting. In the most preferred embodiment of the invention, the point of connection is located a small distance within the needle fitting. This position is preferred because it results in part of the closure member being located within the syringe prior to the application of any separating force. The top end of the needle fitting thereby acts as a guide ensuring that the closure member cleanly enters the body of the syringe upon the application of the separating force.
The closure is preferably of smaller cross section than the needle fitting opening and connected to the internal wall of the needle fitting by a circumferential web. Once this web tears, the closure is of appropriate size to readily move down inside the body of the syringe.
The body of the syringe can be seen as comprising two separate internal compartments. The first being immediately inside the needle fitting section of the syringe body ("the needle fitting compartment") and the second being the remaining section sealed by the stoppe

REFERENCES:
patent: 3577980 (1971-05-01), Cohen
patent: 3941128 (1976-03-01), Baldwin
patent: 4233975 (1980-11-01), Yerman
patent: 5017191 (1991-05-01), Yamada et al.
patent: 5383864 (1995-01-01), Van den Hevvel
International Search Report.

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