Abstract
There is 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. The proposed device comprises an input unit (11) for receiving detection signals reflected back from 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 two photo-plethysmography, PPG, signals at two different wavelengths from said detection signals, and a processing unit (13) for computing the concentration of a desired substance in the blood of the subject based on said PPG signals, wherein said computation is adapted to the skin tone of the subject.
| Original language | English |
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| Patent number | WO2016083228 |
| IPC | A61B 5/ 1455 A I |
| Priority date | 24/11/14 |
| Publication status | Published - 2 Jun 2016 |