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Method and apparatus for cuff-less blood pressure measurement in a mobile device

  • US 10,398,324 B2
  • Filed: 08/31/2018
  • Issued: 09/03/2019
  • Est. Priority Date: 03/03/2016
  • Status: Active Grant
First Claim
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1. A system for measuring blood pressure, comprising:

  • a mobile device including a processor and a display unit; and

    an encasing configured to encase the mobile device, wherein the encasing includes;

    a sensing unit integrated into the encasing and configured to measure blood pressure at a fingertip of a user, wherein the sensing unit includes a reflectance-mode photo-plethysmography (PPG) sensor configured to measure blood volume oscillations and a force sensor configured to measure pressure applied by the fingertip; and

    a visual guide disposed on the encasing and arranged in relation to the sensing unit, where the visual guide comprise indicia to guide the user in placing a base of fingernail and a center of the finger in relation to the sensing unit;

    wherein the system includes a non-transitory computer-readable medium that stores instructions that, when executed by the processor, cause the processor to;

    measure pressure applied to the sensing unit by a fingertip of a user,measure blood volume oscillations in the fingertip,guide the user via the display unit to vary pressure being applied to the sensing unit while the blood volume oscillations and pressure are measured,generate an oscillogram from the measured pressure and the measured blood volume oscillations, where the oscillogram plots amplitude of blood volume oscillations as a function of the measured pressure,calculate a blood pressure value from the oscillogram, andpresent the blood pressure value on the display unit.

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