Method and apparatus for controlling the flow rate of washing solution during the washing step in a blood centrifugation bowl
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United States of America Patent
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Aug 13, 2013
Grant Date -
May 29, 2008
app pub date -
Nov 27, 2006
filing date -
Nov 27, 2006
priority date (Note) -
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Abstract
A method of washing blood mixed with undesirable elements not normally found in healthy whole blood to remove the undesirable elements, the method comprising: separating the blood into components according to relative densities of the components with a rotating centrifuge bowl; providing a port through which fluid exits the bowl, the exiting fluid having a concentration of undesirable elements; flowing washing solution into the centrifuge bowl at an initial flow rate; monitoring the fluid exiting the bowl with an optical sensor having an output signal indicative of the composition of the exiting fluid; and increasing and decreasing the flow rate of the wash solution as a function of the output signal.
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