LED light source-based instrument for non-invasive blood analyte determination
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United States of America Patent
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Nov 9, 2004
Grant Date -
Apr 11, 2002
app pub date -
Sep 17, 2001
filing date -
Sep 26, 2000
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Expired
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Abstract
A compact, lightweight instrument for non-invasive blood analyte determination employs a light source incorporating an assembly of LED's interconnected within a thermally stable substrate. A large diameter mixer couples the signal to a fiber optic probe for delivering the signal to a tissue measurement site. Back-diffused light is collected and dispersed across an array of photo detectors in a miniature spectrometer instrument. A high-speed DSP executes an algorithm for predicting concentration of a target analyte, which is output to a LCD display. Instrument control is by means of keypad or voice recognition. High conversion efficiency of the light source results in extremely low power dissipation and virtually no heat generation, making incorporation of the light source and the spectrometer into a single unit practicable. High-speed pulsing of the signal allows application of high-sensitivity, synchronous detection techniques. Speed and flexibility in sequencing LED's allows simultaneous measurement and skin temperature control.
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