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Blood pressure measuring device and method of calibrating thereof

  • US 9,204,809 B2
  • Filed: 02/01/2012
  • Issued: 12/08/2015
  • Est. Priority Date: 02/01/2012
  • Status: Active Grant
First Claim
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1. A method of operating a blood pressure measurement device adapted for measuring blood pressure on an external surface of a user, comprising the steps of:

  • a) determining an optimal location for calculating said blood pressure by a processing unit of said device based on a plurality of optical pulses and a plurality of pressure pulses obtained from an optical sensing unit and a pressure sensing unit of said device substantially simultaneously while applying a first constant external pressure by controlling an actuating unit of said device;

    b) performing a cuff calibration to obtain parameters for said blood pressure calculation by said processing unit;

    c) calculating said blood pressure based on an optical pulse, a pressure pulse and an optimal external pressure measured at a location of measurement which is aligned to said optimal location and said parameters for said blood pressure calculation by said processing unit, andd) determining whether further cuff calibration is needed based on said pressure pulse at said location of measurement, said optimal external pressure and said optical pulse at said location of measurement by;

    (1) comparing said pressure pulse at said location of measurement against a first threshold;

    (2) comparing a percentage difference between said optimal external pressure and a reference external pressure against a second threshold;

    (3) comparing a percentage difference between said optical pulse at said location of measurement and a reference optical pulse against a third threshold;

    (4) comparing a ratio of a weighted combined amplitude of said optimal external pressure and said optical pulse at said location of measurement to a weighted combined amplitude of said reference external pressure and said reference optical pulse against a fourth threshold; and

    (5) waiving said further cuff calibration ifi. said pressure pulse at said location of measurement is larger than said first threshold,ii. said percentage difference between said optimal external pressure and said reference external pressure is less than said second threshold,iii. said percentage difference between said optical pulse at said location of measurement and said reference optical pulse is less than said third threshold, andiv. said ratio of weighted combined amplitude of said optimal external pressure and said optical pulse at said location of measurement to said weighted combined amplitude of said reference external pressure and said reference optical pulse is less than said fourth threshold.

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