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11. REFERENCE
Measurement Principle
Oxygen Saturation Monitor PULSOX-2 is a photometric instrument
that non-invasively and continuously measures the oxyhemoglobin
saturation of arterial blood (SpO
described by the equation:
SpO
=
2
C (HbO
where
C (Hb):
Concentration of reduced hemoglobin
C (HbO
): Concentration of oxyhemoglobin
2
The light-absorption characteristics of reduced hemoglobin (Hb) are
very different from those of oxyhemoglobin. The PULSOX-2
measures the changes in the absorption of red and infrared lights
passing through the tissue to determine the SpO
this method is free from the effects of skin color, muscles, bones,
and veins.
Spectral Absorption of Hb and HbO
cm
-6
10
mole
20
C (HbO
)
2
) + C (Hb)
2
2
Red light
1.0
0.5
HbO
2
600
665
) and the pulse rate. SpO
2
100 (% SpO
2
Hb
700
800
Wavelength
)
2
of the blood. Thus,
2
Infrared light
880
900 nm
is
2
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