Measurement device for non-invasively determining the concentration of polarising substances
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United States of America Patent
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Nov 18, 1997
Grant Date -
N/A
app pub date -
Jun 15, 1995
filing date -
Dec 15, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device and method are disclosed for noninvasively measuring the concentration of sugar in the blood of a human subject. The method includes generating a beam of monochromatic light, confining the light beam to a predetermined optical path to impinge on a preselected portion of the body of the subject, polarizing the light beam, and performing both a static extinction measurement using the monochromatic light and a dynamic polarization measurement using the polarized light to obtain a measurement of the concentration of sugar in the blood in the preselected body portion. The dynamic polarization measurement is performed by analyzing the polarized light beam after impingement on the body portion while rotating the beam to produce a measurement signal indicative of the angle of polarization thereof, generating a reference signal indicative of influence of rotation of the beam on the angle of polarization thereof in the absence of blood in the optical path, and comparing the measurement signal and the reference signal to determine the angle of deflection of the light beam attributable to the presence of blood sugar in the optical path as a measure of the concentration of sugar in the blood flowing through the body portion.
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