NONINVASIVE MEASUREMENT OF GLUCOSE THROUGH THE OPTICAL PROPERTIES OF TISSUE
摘要
Methods and apparatus for non-invasive determination of blood analytes, such as glucose, through NIR spectroscopy utilize optical properties of tissue as reflected in key spectroscopic features to improve measurement accuracy and precision. Physiological conditions such as changes in water distribution among tissue compartments lead to complex alterations in the measured absorbance spectrum of skin and reflect a modification in the effective pathlength of light, leading to a biased noninvasive glucose measurement. Changes (106) in the optical properties of tissue are detected by identifying key features responsive to physiological variations. Conditions (107) not conducive to non-invasive measurement of glucose are detected. Non-invasive glucose measurements that are biased by physiological changes in tissue are compensated (103). In an alternate embodiment, glucose is measured indirectly based on natural physiological response of tissue to glucose concentration. A spectroscopic device capable of such measurements is provided.