Non-invasive measurement of blood analytes using photodynamics
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Abstract
The determination of blood glucose in an individual is carried out by projecting illuminating light into an eye of the individual to illuminate the retina with the light having wavelengths that are absorbed by rhodopsin and with the intensity of the light varying in a prescribed temporal manner. The light reflected from the retina is detected to provide a signal corresponding to the intensity of the detected light, and the detected light signal is analyzed to determine the changes in form from that of the illuminating light. For a biased sinusoidal illumination, these changes can be expressed in terms of harmonic content of the detected light. The changes in form of the detected light are related to the ability of rhodopsin to absorb light and regenerate, which in turn is related to the concentration of blood glucose, allowing a determination of the relative concentration of blood glucose. Other photoreactive analytes can similarly be determined by projecting time varying illuminating light into the eye, detecting the light reflected from the retina, and analyzing the detected light signal to determine changes in form of the signal due to changes in absorptivity of a photoreactive analyte.
9 Citations
37 Claims
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1-28. -28. (canceled)
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29. A method for measuring blood glucose level in an individual, comprising:
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illuminating a portion of the retina positioned outside the normal retinal vasculature to alter the concentration of a visual pigment in the portion of the retina;
measuring a rate of change of the visual pigment concentration in the portion of the retina outside the retinal vasculature; and
determining the blood glucose level of the individual based on the measured rate of change of visual pigment concentration. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
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Specification