Device, system and method for determining the concentration of a substance in the blood of a subject

G. de Haan (Inventor), M.J. Rocque (Inventor)

Research output: PatentPatent publication

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Abstract

The present invention relates to a device, system and method for determining the concentration of a substance, such as the oxygen saturation, in the blood of a subject, which reduce or remove the influence of specular reflection and/or subject motion. The proposed device comprises an input unit (11) for receiving detection signals reflected back or transmitted through a skin area of the subject in response to irradiation of the skin area by a radiation signal, a signal extraction unit (12) for extracting at least three photo-plethysmography, PPG, signals at different wavelengths from said detection signals, a processing unit (13) for normalizing said at least three PPG signals and forming a first difference signal between a first normalized PPG signal and a second normalized PPG signal and a second difference signal between a third normalized PPG signal and one other of the at least three normalized PPG signals and for forming a ratio between said first difference signal and said second difference signal, and an concentration detection unit (14) for calculating the concentration of a substance in the blood of the subject based on said ratio.

Original languageEnglish
Patent numberWO2015197383
IPCA61B 5/ 1455 A I
Priority date23/06/14
Publication statusPublished - 30 Dec 2015

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