Surgery – Diagnostic testing – Liquid collection
Patent
1997-04-30
1999-01-19
Weiss, John G.
Surgery
Diagnostic testing
Liquid collection
600583, 210782, 210359, 210516, 422101, A61B 500, B01D 2126
Patent
active
058609377
ABSTRACT:
An assembly for collection of a sample of a body fluid from a subject's body of the present invention includes a hollow tube defining an axis with an open end and a closed end. The hollow tube defines a chamber therewithin for receiving a sample of a collected fluid from a subject. The tube has a resilient closure disposed in the open end to close the chamber and to form a seal capable of maintaining a pressure differential between atmospheric pressure and a pressure less than atmospheric pressure within the chamber. The chamber contains an aliquot of an aqueous additive for treating the fluid sample. The chamber also includes a matrix formed from a fibrous material having capillary spaces therein for absorbing the aliquot of the aqueous additive and an aliquot of a water immiscible liquid with a density greater than about 1.07 grams per milliliter to encapsulate the aqueous additive absorbed on the matrix. The tube has a normally closed resilient valve disposed in the chamber to contain the aqueous additive, the liquid and the matrix between the closed tube end and the valve. The valve is openable by centrifugation when there is a sample in the tube thereby allowing the lower density fractions of the sample and the aqueous additive to collect above the valve and to mix.
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patent: 5634474 (1997-06-01), Grippi
Becton Dickinson & Company
Cho David J.
Dawson Arthur D.
Weiss John G.
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