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Measuring the change of intravascular blood volume during blood filtration

  • US 5,230,341 A
  • Filed: 02/25/1991
  • Issued: 07/27/1993
  • Est. Priority Date: 08/13/1988
  • Status: Expired due to Term
First Claim
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1. Apparatus for measuring the change in intravascular blood volume occurring during a blood filtration procedure by measuring the change of the hematocrit of the blood, said apparatus being adapted for use with a blood purification device in which the filtration procedure is carried out and which has an extracorporeal blood circuit connected to a patient, said apparatus comprising:

  • a measuring device comprising ultrasonic sensor means adapted to be connected to the extracorporeal blood circuit of the device for ultrasonically examining the blood flowing in the circuit and for providing a signal indicative of the hematocritic properties thereof; and

    an evaluating unit coupled to said sensor means, said evaluating unit including means for receiving the signal from said ultrasonic sensor means, said evaluating unit including means for storing a signal from said ultrasonic sensor means obtained at the start of the blood filtration procedure, and said evaluating unit including means for determining the change in the signal from said ultrasonic sensor means occurring during the blood filtration procedure for determining the change in the hematocrit of the blood and thus the change in the intravascular blood volume.

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