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Apparatus and method for using ultrasound to determine hematocrit

  • US 4,854,170 A
  • Filed: 10/12/1988
  • Issued: 08/08/1989
  • Est. Priority Date: 10/12/1988
  • Status: Expired due to Term
First Claim
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1. An apparatus for determining hematocrit comprising:

  • a microhematocrit capillary tube;

    a blood sample in the microhematocrit capillary tube;

    an ultrasound transducer for producing ultrasound energy;

    a frequency generator means for generating a preselected frequency signal for the ultrasound transducer;

    amplifier means for amplifying the frequency signal from the frequency generator and transmitting the amplified signal to the ultrasound transducer;

    coupling means for coupling the ultrasound energy from the ultrasound transducer into the blood sample; and

    a meniscus formed at the end of the blood sample, the meniscus forming a reflector for ultrasound energy in the blood sample thereby creating a standing wave in the ultrasound energy in the blood sample.

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