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System and method for in-vivo hematocrit measurement using impedance and pressure plethysmography

  • US 6,128,518 A
  • Filed: 07/23/1998
  • Issued: 10/03/2000
  • Est. Priority Date: 10/04/1990
  • Status: Expired due to Fees
First Claim
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1. A method of measuring the hematocrit of blood perfusing a living body part, the method comprising:

  • driving first and second alternating currents of different frequencies between separate points on the body part;

    monitoring first and second signals induced in the body part by the respective first and second currents;

    generating first and second pulsatile signals and first and second baseline signals from the respective first and second induced signals; and

    determining the hematocrit of the blood from the first and second pulsatile signals and the first and second baseline signals.

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