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Noncontactive arterial blood pressure monitor and measuring method

  • US 4,846,189 A
  • Filed: 06/29/1987
  • Issued: 07/11/1989
  • Est. Priority Date: 06/29/1987
  • Status: Expired due to Fees
First Claim
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1. An apparatus for automatically measuring a person'"'"'s blood pressure comprising:

  • means for applying pressure to a body part of the person in response to a pressure supply signal, and for temporarily occluding the flow of blood on said body part by application of said pressure;

    means for directing light toward the body part and an artery in the body part;

    means for directing the intensity of light passing through or reflected by the body part and artery and for producing therefrom a signal V(t) representing the relative volume of a unit length of the artery, and having an AC component and DC component;

    means for detecting the pressure applied to the body part and producing a signal Pc (t) representing said detected pressure; and

    processor means for(a) calculating means pressure Pm and systolic pressure Ps from said signal Pc (t) and said AC component of said signal V(t)(b) thereafter controlling said means for applying pressure so as to remove the pressure from the body part,(c) calculating a formulation of arterial pressure P(t) as a function of relative arterial volume V(t) using said means pressure Pm and systolic pressure Ps, and(d) for continuously using said signal V(t) for calculating the arterial pressure P(t) of the person from said signal V(t).

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