Separator float and tubular body for blood collection and separation and method of use thereof
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United States of America Patent
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-
Oct 1, 1996
Grant Date -
N/A
app pub date -
Dec 13, 1994
filing date -
Dec 13, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
A separator float has a generally cylindrical body and a water swellable band having a selected outer diameter fitted circumferentially around a portion of the generally cylindrical body. The water swellable band is made of a water swellable material so that upon being exposed to water the water swellable band swells to a greater outside diameter. The separator float is preferably used in a blood collection tube and has a specific gravity between specific gravities of a light phase and a heavy phase of the blood. After the blood has been collected and centrifuged the separator float moves to a position between the light phase and the heavy phase and the water swellable band is exposed to water in the blood causing the band to swell and create a seal. Thereafter, the serum or plasma as well as white blood cells, lymphocytes, monocytes and platelets can be removed from the blood collection tube.
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