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Apparatus and process for determining systolic pressure

  • US 4,009,709 A
  • Filed: 05/15/1975
  • Issued: 03/01/1977
  • Est. Priority Date: 05/15/1975
  • Status: Expired due to Term
First Claim
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1. An apparatus for determining systolic pressure, comprising:

  • a pressure cuff attachable to a living test subject adjacent a blood vessel;

    means for changing pressure in the cuff and thereby applying pressure to the subject;

    means communicating with said cuff for measuring a quantity proportional to a time-dependent fluctuating component representative of the pulsatile pressure within the blood vessel, said means having a frequency response of at least about five times the pulse rate of the subject whereby said quantity is proportional to the amplitude of said pulsatile pressure;

    means for determining the maximum value attained by said quantity as the applied pressure is changed;

    means for storing a representation of said maximum value;

    means for determining when said quantity is substantially equal to about one-half of said maximum value for an applied pressure greater than the pressure applied when said maximum value results; and

    means for reading out applied pressure corresponding to said quantity being substantially equal to about one-half of said maximum value, said read-out pressure corresponding to the systolic pressure of said subject.

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