Disposable syringe and injector

Details Disposable syringe and injector Disposable syringe and injector

1991-08-16

1993-03-02

Pellegrino, Stephen C.

Surgery

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

Treating material introduced into or removed from body...

604 68, 604222, A61M 530

Patent

active

051905230

ABSTRACT:
In general, syringes for needleless injectors must be resonably accurately dimensioned, and the barrel of the injector must be formed of metal in order to prevent expansion of the syringe under pressure. A simple alternative is a syringe including an elongated tubular body with one open end and a closed end containing an injection orifice, and a plug slidable in the body with a prong at one end of the plug extending towards the orifice end of the body, the prong carrying an O-ring and an annular seal which prevents squeezing of the O-ring between the body of the syringe and the plug under injection pressures. An alternative form of syringe includes a pair of valves, one of which normally closes the injection orifice, and the other of which is mounted on the plug. the orifice valve opens under injection pressure to permit the passage of medicine from the syringe body through the orifice, and the other valve opens when the plug, which contains a longitudinally extending passage, is moved away from the orifice end of the syringe body. With such syringes, the body of the injector can be manufactured from plastic, as can the barrel for receiving the syringe. Moreover parts no longer need to be particularly accurately dimensioned.

REFERENCES:
patent: 3859996 (1975-01-01), Mizzy et al.
patent: 4059107 (1977-11-01), Iriguchi et al.
patent: 4941880 (1990-07-01), Burns
patent: 5062830 (1991-11-01), Dunlap
patent: 5064413 (1991-11-01), McKinnon et al.

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