Method and apparatus for non-invasively determining blood analytes
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United States of America Patent
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Apr 8, 1997
Grant Date -
N/A
app pub date -
Apr 6, 1995
filing date -
Apr 6, 1995
priority date (Note) -
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Abstract
Method and apparatus for determining concentration of blood analytes non-invasively. Blood carrying tissue is illuminated with incident light at a selected frequency or frequencies. Light diffusely reflected from or transmitted through the tissue is collected, a portion of the reflected or transmitted light being frequency shifted with respect to the incident light by interaction with blood moving within the tissue. The frequency shifted portion of the light is analyzed to determine the concentration of blood analytes. Preferred embodiments are used to determine glucose concentration or measure the oxygenation of blood.
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