Non-invasive measurement of blood oxygen saturation

A - Human Necessities – 61 – B

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A61B 5/145 (2006.01) A61B 5/1455 (2006.01)

Patent

CA 2684903

The invention relates to a method for non-invasive determination of oxygen saturation of blood within a deep vascular structure of a human patient comprising locating on skin of the patient in a vicinity of the deep vascular structure of interest emitter and receiver elements of a light oximeter device, wherein optimal location of said elements is achieved through matching of a plethysmography trace obtained from the oximeter device to known plethysmography characteristics of the deep vascular structure of interest, and wherein oxygen saturation is determined from a ratio of light absorbed at different wavelengths by haemoglobin in the blood within the vascular structure of interest. The invention also relates to modified oximetry devices capable of carrying out the method.

L'invention concerne un procédé de détermination non invasive de la saturation en oxygène du sang dans une structure vasculaire profonde d'un patient humain. Le procédé selon l'invention comprend la disposition sur la peau du patient, à proximité de la structure vasculaire profonde d'intérêt, d'éléments émetteur et récepteur d'un dispositif d'oxymètrie léger. Selon l'invention, la disposition optimale desdits éléments est obtenue par correspondance d'une trace de pléthysmographie obtenue à partir du dispositif d'oxymètrie à des caractéristiques connues de pléthysmographie de la structure vasculaire profonde d'intérêt et la saturation en oxygène est déterminée à partir d'un rapport de lumière absorbée à différentes longueurs d'onde par l'hémoglobine du sang dans la structure vasculaire d'intérêt. L'invention concerne également des dispositifs d'oxymétrie modifiés capables de mettre en AEuvre le procédé.

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