One-way evacuated tube stopper

Details One-way evacuated tube stopper One-way evacuated tube stopper

1977-06-08

1979-01-16

Wolk, Morris O.

Bottles and jars

Closures

Self-sealing, piercable-type closure

128 2F, 128DIG5, 215260, 422 99, B65D 5100, A61B 514

Patent

active

041345126

ABSTRACT:
Stopper for an evacuated tube with an open end for collecting fluid such as blood samples. The stopper includes a plug adapted to be mounted in the opening in the tube so as to normally seal the tube. The plug permits access of a fluid sample needle therethrough into fluid communication with the reduced pressure interior of the tube so that fluid is collected in the tube from the needle. A check valve is on the plug to automatically open when the needle is inserted through the plug and subjected to the reduced pressure in the tube and to automatically close when subjected to a predetermined amount of pressure from within the tube such as that caused by backflow thereby preventing any fluid passing into the needle from the tube. The check valve includes a chamber which can be used as a reagent holder prior to the tube use.

REFERENCES:
patent: 2969066 (1961-01-01), Holter et al.
patent: 3405706 (1968-10-01), Cinqualbre
patent: 3417750 (1968-12-01), Carson
patent: 3463159 (1969-08-01), Heimlich
patent: 3817240 (1974-06-01), Ayres
patent: 3848603 (1974-11-01), Throner
patent: 3874367 (1975-04-01), Ayres

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