MULTI-STREAM SENSOR FOR NONINVASIVE MEASUREMENT OF BLOOD CONSTITUENTS
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Abstract
The present disclosure relates to a sensor having a set of photodetectors that are arranged at various locations to enable the measurement of blood glucose. The photodetectors are arranged across multiple locations. For example, the detector may comprise multiple photodetector arrays that are arranged to have a sufficient difference in mean path length to allow for noise cancellation and noise reduction. Walls may be used in the detector to separate individual photodetectors and prevent mixing of detected optical radiation between the different locations on the measurement site. A window may also be employed to facilitate the passing of optical radiation at various wavelengths for measuring glucose in the tissue.
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Citations
33 Claims
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1-13. -13. (canceled)
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14. A physiological, noninvasive detector configured to detect optical radiation from a tissue site in order to measure physiological parameters of pulsating blood in living tissue, said detector comprising:
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a set of photodetectors that each provide a signal stream indicating optical radiation that has been transmitted through the tissue site from a plurality of emitters, wherein the set of photodetectors are arranged in a logarithmically spaced configuration that provides a variation in path lengths between at least some of the photodetectors; and a conversion processor that provides information indicating an analyte in the tissue site based on ratios of pairs of the signal streams. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A physiological, noninvasive detector configured to detect optical radiation from a tissue site in order to measure physiological parameters of pulsating blood in living tissue, said detector comprising:
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a set of photodetectors that each provide a signal stream indicating optical radiation of light emitted from a plurality of emitters and attenuated by the tissue site, wherein the set of photodetectors are arranged in a spacial configuration that provides a variation in path lengths between at least some of the photodetectors, and the set of photodetectors are arranged in at least one row; and a conversion processor that provides information indicating an analyte in the tissue site based on ratios of pairs of the signal streams. - View Dependent Claims (24, 25, 26, 27, 28)
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29. A physiological, noninvasive sensor configured to obtain physiological information from a patient, the sensor comprising:
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an emitter configured to emit light into a digit or ear of the patient; and a set of photodetectors configured to detect optical radiation that has been transmitted through the digit or ear and each generate a signal responsive to the detected optical radiation, the set photodetectors being arranged in a two-dimensional grid that provides a variation in path lengths between at least some of the photodetectors, the signals being usable to determine physiological information concerning the patient. - View Dependent Claims (30, 31, 32, 33)
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Specification