Blood sampling assembly having porous vent means vein entry indi

Details Blood sampling assembly having porous vent means vein entry indi Blood sampling assembly having porous vent means vein entry indi

1978-06-15

1980-06-17

Howell, Kyle L.

Surgery

Truss

Pad

128764, 128218NV, 128274, 137854, 137197, A61B 514

Patent

active

042078709

ABSTRACT:
A blood sampling assembly is provided which has a cannula designed for intravenous penetration, a mechanism for applying negative pressure to the cannula, a chamber located between the cannula and the source of negative pressure, a one-way valve positioned within the chamber, and a venting member within the chamber which allows the venting of air as blood enters the chamber, but does not allow the passage of blood. A person drawing blood is enabled to visually determine when a needle is properly inside a vein through transparent walls of the chamber. Spillage of blood is avoided with the present assembly by the resistance of the one-way valve to flow distally from the intravenous cannula.

REFERENCES:
patent: 2913000 (1959-11-01), Roberts
patent: 3817240 (1974-06-01), Ayres
patent: 3859998 (1975-01-01), Thomas
patent: 3864979 (1975-02-01), Ayres
patent: 4016879 (1977-04-01), Mellor
patent: 4046144 (1977-09-01), McFarlane

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