Motion compatible sensor for non-invasive optical blood...

A - Human Necessities – 61 – B

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A61B 5/00 (2006.01) A61B 5/1455 (2006.01)

Patent

CA 2267414

A non-invasive optical sensor (40) which uses the motion signal to calculate the physiological characteristic being measured. For pulse oximetry, a least squares or a ratio-of-ratios technique can be applied to the motion signal itself. This is made possible by selecting a site on the patient where variations in motion produce signals of two wavelengths which are sufficiently correlated. In particular, it has been determined that a sensor (40) placed on a nail, in particular a thumbnail (42), exhibits the characteristics of having the red and infrared signals correlated when used for pulse oximetry, and the resulting signals correlate to arterial oxygen saturation.

La présente invention concerne un capteur, de type optique et non invasif, qui utilise le signal du mouvement pour calculer la caractéristique physiologique à mesurer. Dans le cas de l'oxymétrie pulsée, on applique au signal du mouvement lui-même une technique des plus petits carrés ou une technique de rapport de rapports. Cela est possible en choisissant un site sur le patient où les variations de mouvement produisent des signaux de deux longueurs d'ondes qui sont suffisamment corrélées. En particulier, on a trouvé qu'un capteur placé sur un ongle, notamment l'ongle du pouce, a pour caractéristique de présenter des signaux du rouge et de l'infrarouge en corrélation lorsqu'on utilise ce capteur pour l'oxymétrie pulsée, et qu'en plus, les signaux résultants sont en corrélation avec la saturation artérielle en oxygène.

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