Patent ID: 6312607
Filing Date: 2001-11-06
Classification: A61M,B01D,B04B

Abstract:
A blood processing system comprisingan input to receive a value indicating a desired platelet volume,a separation chamber assembly operating to separate blood into constituents including a plasma constituent containing platelets and having an optical density,an outlet path for conveying a volume of the plasma-constituent from the separation chamber during a processing period, the volume of plasma constituent containing a platelet volume,a sensor assembly operating to detect the optical density of the plasma constituent in the outlet path during several sample intervals within the processing period and generate for each sample interval a sampled opacity value expressing the detected optical density as a function of incremental plasma volume processed during the respective sample interval,a first processing element coupled to the sensor including an element that is operable to sum the sampled opacity values over the processing period and generate an integrated opacity value output, anda second processing element which receives as input the integrated opacity value output and generates a second output based, at least in part, upon the integrated opacity value output, comprising a value indicating a blood volume that needs be processed to obtain the desired platelet volume.