Filter and valve assembly for hypodermic syringe

Details Filter and valve assembly for hypodermic syringe Filter and valve assembly for hypodermic syringe

1980-08-01

1982-06-01

Yasko, John D.

Surgery

Respiratory method or device

Ozone or ion generation

1282723, A61M 500

Patent

active

043322492

ABSTRACT:
Medicinal fluid to be injected into a patient is drawn into a hypodermic syringe barrel through the valve portion of a combination valve and filter assembly, and is ejected through the filter, thereby preventing particulate contamination of the injected medicine. The valve and filter assembly comprises a generally cylindrical, porous filter element, and an elastomeric valve having a generally annular skirt portion overlying the distal end of the filter element and a central portion extending into the central passage in the filter. The central portion of the valve has a slit therein which opens to permit the flow of medicinal fluid therethrough in a distal-to-proximal direction, but closes to block the flow of fluid therethrough in a proximal-to-distal direction.

REFERENCES:
patent: 3736932 (1973-06-01), Satchell
patent: 4066079 (1978-01-01), Chiarolla
patent: 4133314 (1979-01-01), Bloom et al.
patent: 4230112 (1980-10-01), Smith

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