Blood processing systems and methods using apparent hematocrit as a process control parameter
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United States of America Patent
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Issued Date -
Jul 19, 2001
app pub date -
Mar 2, 2001
filing date -
Jun 7, 1995
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Abstract
Blood processing systems and methods separate whole blood into red blood cells and a plasma constituent within a rotating centrifugal separation device. The systems and methods convey whole blood into the separation device through an inlet path including a pump operable at a prescribed rate. The systems and methods remove plasma constituent from the separation device through an outlet path including a pump operable at a prescribed rate. The systems and methods derive a value H.sub.b representing an apparent hematocrit of whole blood entering the separation device, where: 1 H b =H rbc( Q b - Q p )Q b and where H.sub.rbc is a value relating to hematocrit of red blood cells in the separation device. The systems and methods generate outputs and control commands based, at least in part, upon H.sub.b.
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