Oct 16, 2015
Non-Invasive measurement of arterial oxygen saturation in the blood.
Continuous Monitoring
Electrical Safe
R = Log10 (I1/Iin1) / Log10 (I2/Iin2) arn is the absorption coefficient of HbO2 at
wavelength n aon is the absorption coefficient of Hb at wavelength n
R = Log10 (Idc + ac/Idc) 1 / Log10 (Idc + ac/Idc) 2
Look-up Tables up to 85%
I=V/R1 Using feedback comparator
Need ?
Ra=56kOhm, Rb=3.3kOhm C=22nF
F=1/2RC
Accuracy Versus Saturation (up to 85%)
Saturation Versus Perfusion
Saturation Versus Motion Artifacts
Accuracy Versus Optical Artifacts
Effect of Temperature
Alarms
Proteus Simulation Studied
Understood Development Process
Possible Sources of Biases Identified