Tissue modulation process for quantitative noninvasive in...

A - Human Necessities – 61 – B

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A61B 5/1455 (2006.01)

Patent

CA 2333565

Methods are provided for noninvasively measuring blood volume and analyte concentration and for obtaining spectroscopic information relating to immobile tissues, such as skin. One method is for determining concentration of an analyte, such as glucose, in blood of a subject. The method comprises irradiating a region of tissue, such as a fingertip, of the subject with a light source; collecting fluorescence spectra by the region of tissue, the quantity of fluorescence spectra being indicative of blood volume; and collecting Raman spectra emitted by the region of tissue at a wavelength range that corresponds to the analyte. The method further comprises dividing the collected Raman spectra by the collected fluorescence spectra to obtain a number proportional to the concentration of analyte per unit blood volume. The method can further comprise determining the integral of net collected spectra, net collected spectra being a difference between spectra collected while the region of tissue is in a blood-replete state and spectra collected while the region of tissue is in a blood-depleted state. The method can further comprise enhancing the spectra collected by performing adjacent averaging smoothing operations. Blood volume in a region of tissue for spectroscopic measurement can be modulated by applying an ultrasonic transducer to the region of tissue, and also by applying a tourniquet.

La présente invention concerne des procédés permettant de mesurer de façon non invasive la masse sanguine et la concentration en analyte et d'obtenir des informations spectroscopiques concernant des tissus immobiles tels que la peau. L'un des procédés précités permet de mesurer la concentration d'un analyte, comme le glucose, dans le sang d'un patient. Ledit procédé consiste à irradier une région de tissu telle qu'un bout de doigt avec une source lumineuse; à recueillir les spectres de fluorescence émis par la région de tissu, la quantité des spectres de fluorescence indiquant la masse sanguine; et à recueillir les spectres Raman émis par la région de tissu dans une gamme de longueurs d'ondes correspondant à l'analyte. On divise ensuite les spectres Raman recueillis par les spectres de fluorescence recueillis afin d'obtenir un nombre proportionnel à la concentration d'analyte par unité de masse sanguine. On peut également mesurer l'intégrale des spectres nets recueillis, l'intégrale des spectres nets recueillis représentant la différence entre les spectres recueillis lorsque la région de tissu se trouve en état d'irrigation sanguine et les spectres recueillis lorsque ladite région ne se trouve pas en état d'irrigation sanguine. On peut aussi accentuer les spectres recueillis en effectuant des opérations de lissage de moyennages adjacents. On peut moduler la masse sanguine dans une région de tissu dans le but d'effectuer les mesures spectroscopiques en appliquant un transducteur ultrasonique sur ladite région et en appliquant un tourniquet.

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