Indirect measurement of tissue analytes through tissue...

A - Human Necessities – 61 – B

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A61B 5/00 (2006.01) G01N 21/35 (2006.01) G01N 21/31 (2006.01) G01N 21/33 (2006.01) G01N 21/65 (2006.01)

Patent

CA 2471564

Methods and system for noninvasive determination of tissue analytes utilize tissue properties as reflected in key features of an analytical signal to improve measurement accuracy and precision. Physiological conditions such as changes in water distribution among tissue compartments lead to complex alterations in the measured analytical signal of skin, leading to a biased noninvasive analyte measurement. Changes in the tissue properties are detected by identifying key features in the analytical signal responsive to physiological variations. Conditions not conducive to the noninvasive measurement are detected. Noninvasive measurements that are biased by physiological changes in tissue are compensated. In an alternate embodiment, the analyte is measured indirectly based on natural physiological response of tissue to changes in analyte concentration. A system capable of such measurements is provided.

L'invention concerne des méthodes et un système permettant de déterminer des analytes tissulaires non invasifs par spectroscopie en proche infrarouge (NIR), qui utilise les propriétés optiques d'un tissu telles qu'elles sont reflétées dans l'exactitude et la précision d'une mesure spectroscopique clé. Des états physiologiques tels que des changements dans la répartition de l'eau dans des compartiments tissulaires conduisent à des altérations complexes de signal analytique mesuré de la peau qui amènent à une mesure d'analyte non invasive faussée. On détecte les changements (106) des propriétés optiques des tissus par identification de caractéristiques clé sensibles à des variations physiologiques. On détecte également des états (107) qui ne sont pas générateurs de mesures non invasives. On compense (103) les mesures non invasives faussées par les changements physiologiques dans un tissu. Dans un autre mode de réalisation, on mesure indirectement l'analyte en fonction d'une réponse tissulaire physiologique naturelle à une concentration d'analyte. L'invention concerne un dispositif spectroscopique capable d'effectuer lesdites mesures.

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