Testing of body fluid constituents through measuring light reflected from tympanic membrane
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United States of America Patent
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May 19, 1992
Grant Date -
N/A
app pub date -
Apr 19, 1990
filing date -
Apr 19, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus and method are disclosed for determining a level of a constituent such as glucose in a body fluid such as blood. The apparatus and method utilize a light generator for generating a testing light of known intensity with the testing light including a wavelength absorbable by the constituent being measured. The light generator also generates a reference light of known intensity having a wavelength not absorbable by the constituent being measured. The testing light and reference light are directed toward a fluid containing an unknown concentration of a constituent. A light detector is provided for measuring the intensity of the testing light and reference light being spectrally modified by the fluid. A light path distance measurer is provided for measuring a distance of a light path traveled by the testing light and reference light. A circuit is provided for calculating a level of the constituent in the fluid in response to a reduction in intensity of the testing light and reference light and in response to the measured distance.
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