The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 2021
Filed:
May. 24, 2016
Koninklijke Philips N.v., Eindhoven, NL;
Olaf Thomas Johan Antonie Vermeulen, Oss, NL;
KONINKLIJKE PHILIPS N.V., Eindhoven, NL;
Abstract
The invention relates to a photoplethysmography apparatus (), comprising a source of light () configured to provide source light () of at least a first and a second spectral position directed at a tissue (); alight detector () configured to detect scattered source light, and to provide at least a first and a second sensor signal () indicative of the scattered source light of the first and second spectral position; and a processing unit (). The processing unit is configured to calculate a corrected sensor signal (), indicative of a variation in blood absorbance within the tissue, by removing a tissue-path error signal component, indicative of a variation in optical path length through the tissue over time, and a light-coupling error signal component, indicative of a variation of source light intensity of the source light emitted at the tissue, from the at least first and second sensor signals.