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2.2 Major Applications and Scope
This device is applicable to home, hospital (including internal medicine,
surgery, anesthesia, pediatrics, emergency room etc.), oxygen bar, the
community medical center, alpine area and it also can be used before or
after sports, and the like. The Fingertip Oximeter can detect SpO
2
, pulse
rate and blood perfusion index.
This device is not appropriate to be used for continuous mon-
itoring.
2.3 Environment Requirements
Operating Temperature: 5°C~40°C
Operating Humidity: 30%~80%
Atmospheric pressure: 70kPa~106kPa
2.4 SpO
2
Common Knowledge
1. Meaning of SpO
2
SpO
2
is the saturation percentage of oxygen in the blood, so called O
2
concentration in the blood; it is defined by the percentage of oxyhemo-
globin (HbO
2
) in the total hemoglobin of the arterial blood. SpO
2
is an
important phy¬siological parameter to reflect the respiration function; it
is calculated by the following method:
SpO
2
= HbO
2
/ (HbO
2
+Hb)×100%
HbO
2
are the oxyhemoglobins (oxygenized hemoglobin), Hb are those
hemoglobins which release oxygen
2. Principle of Measurement
Based on Lamber-Beer law, the light absorbance of a given substance
is directly proportional with its density or concentration. When the light
with certain wavelength emits on human tissue, the measured intensity
of light after absorption, reflecting and attenuation in tissue can reflect
the structure character of the tissue by which the light passes. Due to
that oxygenated hemoglobin (HbO
2
) and deoxygenated hemoglobin
(Hb) have different absorption character in the spectrum range from red
to infrared light (600nm~1000nm wavelength), by using these charac-
teristics, SpO
2
can be determined. SpO
2
measured by this oximeter is
the functional oxygen saturation - a percentage of the hemoglobin that
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