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Systems and methods for sensing red blood cell hematocrit

  • US 6,419,822 B2
  • Filed: 07/10/2001
  • Issued: 07/16/2002
  • Est. Priority Date: 09/03/1999
  • Status: Expired due to Term
First Claim
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1. A blood processing system comprisinga separation chamber for processing blood to obtain a blood suspension containing a quantity of red blood cells, a sensing assembly outside the separation chamber to optically sense presence of red blood cells, and a fluid circuit including an umbilicus coupled to the separation chamber, a blood inlet tube extending beyond the umbilicus outside the separation chamber for conveying a flow of blood into the umbilicus, a component collection tube extending beyond the umbilicus outside the separation chamber for conveying a flow of the blood suspension from the umbilicus, and a fixture including a holder to hold the blood inlet tube and the component collection tube in an adjacent, spaced-apart relationship for handling as a bundle outside the separation chamber, the fixture being movable into releasable engagement with the sensing assembly outside the separation chamber to hold the component collection tube within the holder in a predetermined relationship with the sensing assembly so that presence of red blood cells in the component collection tube can be sensed.

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