Blood Oxygenation Sensor
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United States of America Patent
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Issued Date -
Aug 23, 2007
app pub date -
Feb 18, 2007
filing date -
Feb 21, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A planar dielectric waveguide sensor is used to determine the concentrations of oxygenated and deoxygenated hemoglobin and other blood constituents such as pH, sugar. The planar waveguide core is in direct contact with the blood such that evanescent field of the light propagating within the core is selectively attenuated at specific wavelengths of interest. The planar waveguide has a construction that promotes strong interaction of the evanescent field with blood cells that contact it. In preferred embodiments, the waveguide is constructed of a low refractive index core to propagate an evanescent wave comparable in size to a red blood cell.
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