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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
SpO2
, 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 SpO2 Common Knowledge
1. Meaning of SpO2
SpO2
is the saturation percentage of oxygen in the blood, so called O2
concentration in the blood; it is dened by the percentage of oxyhemo-
globin (HbO2) in the total hemoglobin of the arterial blood.
SpO2
is an
important phy¬siological parameter to reect the respiration function; it
is calculated by the following method:
SpO2 = HbO2/ (HbO2 +Hb)×100%
HbO2 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, reecting and attenuation in tissue can reect
the structure character of the tissue by which the light passes. Due to
that oxygenated hemoglobin (HbO2) 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,
SpO2
can be determined.
SpO2
measured by this oximeter is
the functional oxygen saturation - a percentage of the hemoglobin that
ENGLISH
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