Vented syringe

Details Vented syringe Vented syringe

1985-06-03

1987-09-01

Kamm, William E.

Surgery

Truss

Pad

128766, 604231, 604236, A61B 514

Patent

active

046901540

ABSTRACT:
A vented blood gas syringe is capable of allowing arterial blood to enter into a specimen chamber due to blood pressure or due to the aspirating the blood into the chamber where insufficient blood pressure of the patient exists. The blood gas syringe is fabricated of conventional parts modified for venting. The plunger of a conventional syringe has air passages through the lower rib thereof to allow air to pass into the air space formed by the body of the plunger. The passages are further sized to restrict the flow of blood therethrough. A slice is made in the upper rib and at least one air passage is provided from the air space between the ribs to the slice. The upper portion of the upper rib above the slice becomes a flap which can act as a valve resting on a seat formed by the slice to allow air to pass upward but not downward.

REFERENCES:
patent: 3577980 (1971-05-01), Cohen
patent: 3776218 (1973-12-01), Svensson
patent: 4257426 (1981-03-01), Bailey
patent: 4266557 (1981-05-01), Merry
patent: 4299238 (1981-11-01), Baidwan et al.
patent: 4372325 (1983-02-01), Raitto
patent: 4424817 (1984-01-01), Williams
patent: 4466446 (1984-08-01), Baidwan et al.

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