Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1991-07-10
1994-08-30
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604198, 604263, A61M 500
Patent
active
053423089
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a single-use syringe of a type which comprises a tubular body wherein a plunger is slidable in sealed relationship, a needle mounted in said tubular body at a first axial end thereof and being movable between a first, safe position and a second, working position whereat said needle is retracted into and extended from said body, respectively, through an opening in the latter, a spring biasing said needle toward its retracted position, said needle being temporarily lockable in its working position.
Re-use of a syringe by many is one of the factors that promotes the spreading of diseases whose infection is passed on by contact with infected blood.
Typical is the spreading of AIDS among people addicted to injectable drugs, where there is a habit of sharing one syringe with several persons.
The most popular of know syringes, while explicitly intended for single use, may nevertheless be used more than once without impairing their mechanical efficiency.
Further, and besides the risk represented by possible re-use thereof, such syringes involve a serious risk of incidental pricking because the needle is left exposed on the tubular body after use of the syringe with no safeguard of sort.
In an effort to obviate such drawbacks, syringes have been developed which incorporate provisions to prevent their re-use and/or a retractable needle, to thereby eliminate the risks connected with the handling of a used syringe.
Typical examples of such improved syringes are described in U.S. Pat. Nos. 4,675,005; 4,747,829; 4,692,156; PCT Application No. W088/06461; European Patent Application No. 282097; and U.S. Pat. No. 4,747,830.
However, it has been found that the engineering of these prior types of syringes has resulted in relatively elaborate constructions, quite unsuited to syringes which may be small in size as are use, in particular, by drug addicts. In addition, some of these syringes can be returned to a working condition after use by relatively simple operations to permit their re-use.
The problem underlying this invention is to provide a single-use syringe which is structured and operated in such a manner as to first eliminate any problems in handling a used syringe, and secondly, make re-use of the syringe practically impossible.
SUMMARY OF THE INVENTION
This problem is solved according to the invention by a syringe which comprises an expansible retaining member attached to one end of the needle extending inside said tubular body, at least one step defined in said tubular body at a set distance from said first end, wherefore said step is overridden by said retaining member as said needle is moved from said first to the second position, an expander device for the retaining member carried removably on said plunger and adapted to be received and held in a first socket of the retaining member so as to expand it upon the step being overridden and hold the needle in the working position with said retaining member abutted against the step, and a means of dislodging the expander device from the first socket on completion of a working stroke of the plunger so as to disengage the retaining member from the step and release the needle for return to the first position.
BRIEF DESCRIPTION OF THE DRAWINGS
The features and advantages of this invention will be more clearly apparent fromt he following detailed description of a preferred, but not exclusive, embodiment thereof, shown by way of non-limitative example in the accompanying drawings, where:
FIGS. 1 to 5 are fragmentary sectional views of a syringe embodying this invention, shown at various stages of its operation; and
FIG. 6 is a longitudinal section view of a modified embodiment of a detail of the syringe shown in the previous Figures.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Generally indicated at 1, in FIGS. 1 to 5, is a syringe according to this invention. The syringe 1 comprises a tubular body 2 wherein a plunger 3 is slidable in sealed relationship and is provided, at an axial end thereof, with a piston 4 m
REFERENCES:
patent: 4747829 (1988-05-01), Jacob
patent: 4767413 (1988-08-01), Haber et al.
patent: 4775369 (1988-10-01), Schwartz
patent: 4921486 (1990-05-01), DeChellis et al.
patent: 4955869 (1990-09-01), Bin
patent: 5026353 (1991-06-01), Bartman
patent: 5114404 (1992-05-01), Payton
Alexander V.
BRIEF S.r.l.
Yasko John D.
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