Device, system and method for determining the concentration of a substance in the blood of a subject
US10531820B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 2015 |
| Grant date | Jan 14, 2020 |
| Priority date | — |
| Expiry date | Nov 7, 2038 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2576/00
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In a device, system and method for determining the concentration of a substance, such as the oxygen saturation in the blood of a subject, the influence of specular reflection is reduced or removed. An input unit is configured to receive 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 is configured to extract at least two photo-plethysmography, PPG, signals at two different wavelengths from the detection signals. A processing unit is configured to compute the concentration of a selected substance in the blood of the subject based on the PPG signals taking into account a skin tone of the subject.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.