G - Physics – 01 – N
Patent
G - Physics
01
N
73/55
G01N 21/84 (2006.01) A61B 5/00 (2006.01) G01N 27/74 (2006.01) G01N 33/48 (2006.01)
Patent
CA 1177275
BLOOD CONSTITUENT MEASURING DEVICE AND METHOD Abstract A non-invasive blood constituent measuring device and method are disclosed for measuring changes in blood thickness of predetermined blood constituents relative to total change in blood thickness at a test area to thereby determine the concentration of such constituents in the blood in a living body, which measured constituents may be, for example, hemo- globin and oxyhemoglobin to enable determination of oxygen saturation of blood. The device includes a plurality of light emitting diodes operationally controlled by timing cir- cuitry for sequentially emitting light at different predeter- mined wavelengths toward a blood containing tissue sample, such as an ear lobe. A linear sensor receives emitted light passing through the sample and a train of AC modulated pulses indicative thereof is formed and then the signal representa- tive of the light received from each emitter is scaled so that the DC components of each are normalized to a predeter- mined reference level with the pulse train being divided into channels at a decoder where remaining DC offset is re- moved and the DC component in each channel is then removed at a low pass filter, after which the AC signals in each channel are multiplexed and converted to a digital signal in- dicative of changes in the thickness of blood constituents for processing in a digital processor to determine therefrom the saturation of the measured blood constituents. A test unit is also included for testing operation of the device by introducing known AC modulated test signals into the cir- cuitry.
400235
Biox Technology Inc.
Kirby Eades Gale Baker
LandOfFree
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