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Method of separating the constituents of the blood

  • US 4,968,295 A
  • Filed: 09/21/1987
  • Issued: 11/06/1990
  • Est. Priority Date: 09/22/1986
  • Status: Expired due to Term
First Claim
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1. A method for separating constituents of whole blood which is withdrawn from a donor, mixed with anticoagulant, and supplied to a speed-adjustable blood centrifuge from which blood constituents are withdrawn and thereafter partially collected and partially returned to the donor, which method comprises:

  • measuring flow rates of the whole blood, anticoagulant and of the blood fractions; and

    adjusting a speed of rotation of the centrifuge upon a variation of the flow rate of whole blood according to transition function, which transition function is chosen such that a ratio of volume parts of the blood fractions separated in the centrifuge per unit time to a volume of the whole blood and anticoagulant supplied to the centrifuge in a unit time is approximately the same before an after the variation in the flow rate of whole blood.

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