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Apparatus and process for producing sphygmometric information

  • US 3,903,872 A
  • Filed: 02/25/1974
  • Issued: 09/09/1975
  • Est. Priority Date: 02/25/1974
  • Status: Expired due to Term
First Claim
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1. In an apparatus for producing information indicative of the physical condition of a living test subject, said apparatus including means for applying a selectively changeable pressure to the test subject adjacent a blood vessel and means for measuring a fluctuating quantity proportional to a sum, said sum comprising a time-dependent fluctuating component representative of the pulsatile pressure within the blood vessel, plus the selectively changeable pressure applied externally adjacent the blood vessel, the improvement comprising:

  • means for converting said quantity into an electronic representation of a time derivative of at least the fluctuating component thereof;

    means for analyzing changes in said electronic representation of said time derivative induced by changing the applied pressure; and

    means for producing an output from said analyzing means indicative of the physical condition of the living test subject

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