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Methods, systems, and kits for the extracorporeal processing of blood

  • US 7,004,924 B1
  • Filed: 10/19/1998
  • Issued: 02/28/2006
  • Est. Priority Date: 02/11/1998
  • Status: Expired due to Term
First Claim
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1. A system for processing blood, said system comprising:

  • a pump having a known relationship between pump speed and output flow rate;

    a processing unit connectable to receive blood from the pump;

    a blood draw line connectable between a patient and the pump;

    a blood return line connectable between the processing unit and the patient;

    an external flow detector that can be positioned adjacent to an exterior surface of the blood return line to provide a measured blood flow rate; and

    a control unit connectable to the pump and the external flow detector, wherein the control unit adjusts the pump speed to maintain the measured flow rate at a control point;

    wherein the control unit determines an expected blood flow rate based on the adjusted pump speed, determines a difference between the expected flow rate and the measured flow rate, and initiates an alarm condition when the difference exceeds a threshold value.

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