Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1992-05-20
1994-12-06
Kruter, Jerome L.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604194, 604218, A61M 500
Patent
active
053706196
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a single-use syringe provided with a retractile needle and a self-locking device preventing the syringe from being filled again after the first injection.
As known it is of foremost importance to solve safety problems linked with the undue or irresponsible handling of used syringes, both for the contact risks with the used needle and for the contagious danger involved in a repeated use of the same syringe.
Recently, several syringes have been developed which show the use of retractable needles, and devices to prevent their re-use. However, the structure of these syringes is too elaborate and too expensive to manufacture.
This invention seeks to provide a solution to the above mentioned problem by means of a syringe providing ease of use, protection and inaccessibility of the needle once having made the injection.
SUMMARY OF THE INVENTION
According to the invention there is provided a syringe comprising a cylindrical body provided with a fore end, a plunger sliding in said cylindrical body, a needle receivable in said cylindrical body, said needle moving under control of the plunger from an operative position, in which it is integral with the fore end of the syringe, and projects therefrom, to a protected position where it is locked in said cylindrical body. The locking of the needle both to the body of the syringe and the plunger is made easy and reliable, and above all the syringe is prevented from being used again after the first injection.
This has been achieved by providing the base of the needle with self-engaging means which at the end of the first injection, when the plunger is at the end of its stroke, locks automatically and unreleasably the needle to the plunger and constrains it to enter the body of the syringe again if the plunger is retracted.
BRIEF DESCRIPTION OF THE DRAWING
The invention will be now described with reference to the annexed drawings showing preferred embodiments of the invention as illustrative non-limitative examples.
In the drawings:
FIG. 1 shows the syringe according to the invention with the needle releasably engaging the plunger ready to be moved to the operating position;
FIG. 2 shows the syringe after the first injection;
FIGS. 1a, 1b and 1c are sectional views respectively of the needle base, of the end spout and of the syringe's fore end;
FIG. 3 shows in an enlarged scale the syringe with the extracted needle ready for use and the plunger at the beginning of the filling;
FIG. 4 shows a different embodiment of the device preventing the syringe from being re-used.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
With reference to FIG. 1 numeral 100 designates a body of a syringe of proper size and suitable material which is provided with a fore end or cylindrical spout 102 opened outwardly and provided with inner longitudinal grooves 103. At the other end, body 100 carries the hold flange 105.
Sliding within body 100 of the syringe is a plunger 106 having a thumbpush 107 and disc 25 carrying a rubber gasket 124 abutting against a disc 125 integral with a generally cylindrical fore end 108. Fore end 108 is provided with a cavity 119 and radial cuts 118 allowing the fore end to be opened like a corolla.
The third member of FIG. 1 is a needle 109 integral with a joint or base 110 having outer dimensions corresponding to the inner cavity of projection 102. Base 110 is provided inside with a seat 111 the size of which corresponds to the fore end 108. Formed on the inner walls of seat 111 (FIG. 3) are projections or teeth 112 intended to engage corresponding notches or grooves 113 formed on fore end 108. Seat 111 communicates with needle 109 through a conical projection 114 hanging from socket 115 at the base of needle 109. Socket 115 is provided with tabs 116 radially projecting and facing grooves 103 and projections 104 in spout 102. Projecting tabs 116 and the corresponding projections 104 are three in number but it is evident that this number may be varied.
In operation, the syringe appears as in FIG. 3, needl
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