Non-invasive continuous blood glucose monitoring

A - Human Necessities – 61 – B

Patent

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Details

A61B 6/00 (2006.01) A61B 5/00 (2006.01) G01J 5/00 (2006.01) G01K 13/00 (2006.01)

Patent

CA 2290957

A method and an instrument for a continuous non-invasive detection of an analyte, (e.g., glucose) concentration in a human body tissue such as blood, is disclosed. The instrument remote sensor assembly (7) mounted in subject's ear canal continuously measures analyte concentration by detecting the infrared radiation naturally emitted by a human body. It uses an infrared detector (7) with a combination of adequate filters (6) such as, for example, a negative correlation filter or narrow band filters or other detector filter assemblies. The method and instrument is based on the discovery that natural infrared emission from the human body, especially from the tympanic membrane (1), is modulated by the state of the emitting tissue. Spectral emissivity of human infrared radiation from the tympanic membrane (1) consists of spectral information of the tissue, (e.g., blood) analyte, (e.g., glucose). This can be directly correlated with the blood analyte concentration, for example, the blood glucose concentration.

L'invention concerne un procédé et un instrument de suivi continu non invasif de la concentration d'un analyte (par exemple le glucose), dans des tissus du corps humain tels que le sang. L'ensemble de télédétection dudit instrument (7), monté sur le conduit auditif du sujet, mesure en continu la concentration en analyte, en détectant le rayonnement infrarouge naturellement émis par tout corps humain. Cet instrument utilise notamment un détecteur de rayonnement infrarouge (7) ainsi qu'un ensemble de filtres appropriés (6), par exemple un filtre à corrélation négative, des filtres à bande étroite, ou d'autres ensembles filtres de détection. Ce procédé et cet instrument s'appuient sur la découverte selon laquelle le rayonnement infrarouge émis naturellement par le corps humain, en particulier par la membrane du tympan (1), est modulé par l'état du tissu émetteur. Le pouvoir émissif spectral de ce rayonnement infrarouge humain, provenant de la membrane du tympan (1), est constitué de données spectrales concernant les tissus (par exemple le sang), ou l'analyte (par exemple le glucose). Ces données peuvent être directement mises en corrélation avec la concentration en analyte dans le sang, par exemple la concentration en glucose dans le sang.

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