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Method of removing abnormal data and blood component spectroscopy analysis system employing the same

  • US 8,507,281 B2
  • Filed: 01/07/2004
  • Issued: 08/13/2013
  • Est. Priority Date: 01/07/2003
  • Status: Expired due to Fees
First Claim
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1. A method of removing abnormal data in a blood component analysis system using spectroscopy to estimate a concentration of a blood component by analyzing a photo-plethysmographic (PPG) signal obtained by radiating light of first and second wavelengths reacting to the blood component on a subject and detecting light corresponding to the first and second wavelengths output from the subject, the method comprising:

  • (a) collecting the PPG signal corresponding to the first and second wavelengths for a predetermined unit period of time, the collected PPG signal including “

    n”

    pulse data for each of the first and second wavelengths, the “

    n”

    pulse data representing a group of n pulses in the PPG signal corresponding to the first wavelength and a group of n pulses in the PPG signal corresponding to the second wavelength, n being a positive integer larger than 1;

    (b) calculating a ratio between a maximum intensity value and a minimum intensity value for each pulse of the “

    n”

    pulse data for each of the first and second wavelengths, and obtaining “

    n”

    first ratio values corresponding to the n pulses of the first wavelength and “

    n”

    second ratio values corresponding to the n pulses of the second wavelength;

    (c) calculating third ratio values between the “

    n”

    first ratio values and respective “

    n”

    second ratio values, the third ratio values defining “

    n”

    parameter values with respect to the “

    n”

    pulse data included in the collected PPG signal;

    (d) calculating an average of the “

    n”

    parameter values;

    (e) among the “

    n”

    parameters, determining a number “

    m”

    of parameter values whose deviations from the average calculated in (d) are greater than a predetermined standard deviation, wherein when the first and second wavelengths correspond to an isosbestic point, the predetermined standard deviation is set to ±

    3.5% through ±

    4.5%;

    (f) comparing a ratio m/n with a predetermined removal reference value, and determining whether the “

    n”

    pulse data is valid; and

    (g) replacing invalid “

    n”

    pulse data with new “

    n”

    pulse data, the new “

    n”

    pulse data being new pulse data in a newly collected PPG signal.

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