Patent ID: 8507281
Filing Date: 2013-08-13
Classification: A61B,Y10T

Abstract:
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.