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Method and apparatus for continuously monitoring systolic blood pressure

  • US 4,030,485 A
  • Filed: 11/12/1974
  • Issued: 06/21/1977
  • Est. Priority Date: 11/12/1974
  • Status: Expired due to Term
First Claim
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1. A method for continuously monitoring systolic pressure in a human or animal subject by means of a calibrated instrument including light transducer means for converting variations in light intensity to variations in amplitude of an electrical quantity comprising:

  • detecting, with said transducer means, variations in light intensity corresponding to variations in blood volume of the tissue of said subject under said transducer means;

    whereby the output of said tranducer means comprises variations in amplitude of said electrical quantity corresponding to said variations in blood volume;

    differentiating said variations in amplitude of said electrical quantity with respect to time to provide a differentiated amplitude representative of the rate of said variations in blood volume;

    periodically selecting a sample of said differentiated amplitude; and

    adding to said sample an amplitude of a like electrical quantity representative of a reference pressure;

    to thereby produce an electrical signal whose amplitude is proportional to systolic pressure of said subject; and

    providing said electrical signal to a display means to drive said display means whereby the magnitude of said systolic pressure is displayed on said display means.

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