Sensor for transcutaneous measurement of vascular access...

A - Human Necessities – 61 – B

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A61B 5/00 (2006.01) A61B 5/026 (2006.01) A61M 1/36 (2006.01) G01N 21/03 (2006.01)

Patent

CA 2433278

An optical sensor includes photoemitter and photodetector elements at multiple spacings (d1, d2) for the purpose of measuring the bulk absorptivity (.alpha.) of an area immediately surrounding and including a hemodialysis access site, and the absorptivity (.alpha.o) of the tissue itself. At least one photoemitter element and at least one photodetector element are provided, the total number of photoemitter and photodetector elements being at least three. The photoemitter and photodetector elements are collinear and alternatingly arranged, thereby allowing the direct transcutaneous determination of vascular access blood flow.

L'invention concerne un capteur optique comprenant des éléments de photoémetteur et de photodétecteur au niveau de plusieurs espacements (<i>d¿1?</i>, <i>d¿2?</i>) aux fins de mesure de l'absorptivité de substances en vrac (.alpha.) d'une zone comprenant et entourant de façon immédiate un site d'accès d'hémodialyse et aux fins de mesure l'absorptivité (.alpha.¿o?) du tissu. Au moins un élément de photoémetteur et au moins un élément de photodétecteur sont prévus, le nombre total d'éléments de photoémetteur et de photodétecteur étant égal à au moins trois. Les éléments de photoémetteur et de photodétecteur sont colinéaires et disposés de manière alternée, permettant ainsi la détermination transcutanée directe du débit sanguin d'un accès vasculaire.

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