Syringe for use in the withdrawal of arterial blood

Details Syringe for use in the withdrawal of arterial blood Syringe for use in the withdrawal of arterial blood

1981-10-16

1984-01-24

Cohen, Lee S.

Surgery

Truss

Pad

604187, A61B 514

Patent

active

044270151

ABSTRACT:
A syringe for the collection of arterial blood, that offers near zero resistance to blood flow, eliminates arterial-venous admixing due to aspiration, prevents air trapping, and does not require a lubricant. The syringe embodies a tubular body, a plunger with valve and capillary bore for its entire length. The forward end of plunger is concaved to center at 45 degrees. The capillary bore is communicated with the chamber through said concave surface. The plunger is valved to provide for the withdrawal, and trapping of arterial blood in the chamber. The capillary bore and valve assist operation with self-aspirating analyzers. By nature of friction between the plunger and chamber wall, the device is volume selective.

REFERENCES:
patent: 3577980 (1971-05-01), Cohen
patent: 3648684 (1972-03-01), Barnwell et al.
patent: 3960139 (1976-06-01), Bailey
patent: 3965897 (1976-06-01), Lundquist
patent: 4008718 (1977-02-01), Pitesky
patent: 4073288 (1978-02-01), Chapman
patent: 4091677 (1978-05-01), Oshikubo
patent: 4326541 (1982-04-01), Eckels

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