MULTI-STREAM DATA COLLECTION SYSTEM FOR NONINVASIVE MEASUREMENT OF BLOOD CONSTITUENTS
First Claim
1. A noninvasive device capable of producing a signal responsive to light attenuated by tissue at a measurement site, the device comprising:
- an optical source configured to emit optical radiation at least at wavelengths between about 1600 nm and about 1700 nm; and
a plurality of photodetectors each configured to detect the optical radiation from said optical source after attenuation by said tissue of said measurement site and each output a respective signal stream responsive to said detected optical radiation.
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Accused Products
Abstract
The present disclosure relates to noninvasive methods, devices, and systems for measuring various blood constituents or analytes, such as glucose. In an embodiment, a light source comprises LEDs and super-luminescent LEDs. The light source emits light at least wavelengths of about 1610 nm, about 1640 nm, and about 1665 nm. In an embodiment, the detector comprises a plurality of photodetectors arranged in a special geometry comprising one of a substantially linear substantially equal spaced geometry, a substantially linear substantially non-equal spaced geometry, and a substantially grid geometry.
594 Citations
34 Claims
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1. A noninvasive device capable of producing a signal responsive to light attenuated by tissue at a measurement site, the device comprising:
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an optical source configured to emit optical radiation at least at wavelengths between about 1600 nm and about 1700 nm; and a plurality of photodetectors each configured to detect the optical radiation from said optical source after attenuation by said tissue of said measurement site and each output a respective signal stream responsive to said detected optical radiation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 11, 16, 17, 18)
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8. A noninvasive, physiological sensor capable of outputting a signal responsive to a blood analyte present in a monitored patient, said sensor comprising:
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a sensor housing; an optical source positioned by said housing with respect to a tissue site of a patient when said housing is applied to the patient; and photodetectors positioned by said housing with respect to said tissue site when said housing is applied to the patient with a variation in path length among at least some of the photodetectors from the optical source, the photodetectors configured to detect a sequence of optical radiation from said optical source after attenuation by tissue of said tissue site, said photodetectors each configured to output a respective signal stream responsive to said detected sequence of optical radiation and wherein an output signal responsive to one or more of the signal streams is usable to determine the blood analyte based at least in part on the variation in path length. - View Dependent Claims (9, 10, 12, 13, 14, 15, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method of measuring an analyte based on multiple streams of optical radiation measured from a measurement site, said method comprising:
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emitting a sequence of optical radiation pulses to the measurement site; detecting at a first location a first stream of optical radiation from the measurement site; detecting at least at one additional location different from the first location an additional stream of optical radiation from the measurement site; and determining an output measurement value indicative of the analyte based on the detected streams of optical radiation. - View Dependent Claims (30, 31, 32, 33, 34)
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Specification