Methods and apparatus for isolating platelets from blood
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United States of America Patent
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Feb 10, 2015
Grant Date -
Nov 7, 2013
app pub date -
Jul 1, 2013
filing date -
May 3, 2002
priority date (Note) -
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Abstract
A platelet collection device comprising a centrifugal spin-separator container with a cavity having a longitudinal inner surface. A float in the cavity has a base, a platelet collection surface above the base, an outer surface. The float density is below the density of erythrocytes and above the density of plasma. The platelet collection surface has a position on the float which places it below the level of platelets when the float is suspended in separated blood. During centrifugation, a layer of platelets or buffy coat collects closely adjacent the platelet collection surface. Movement of a float having a density greater than whole blood through the sedimenting erythrocytes releases entrapped platelets, increasing the platelet yield.
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