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9
Chapter 2 About This Product
2.1 Overview
SpO
2
stands for peripheral capillary oxygen saturation. Oxygen
saturation is defined as the ratio of oxyhemoglobin (HbO
2
) to the total
concentration of hemoglobin (i.e. Oxyhemoglobin + reduced
hemoglobin) present in the blood. It is an important physiological
parameter involved in respiration and circulation. The Pulse Oximeter
feature herein is small, portable, non-invasive and easy to use. The
user only needs to insert a finger into the chamber to measure
his/her SpO
2
level and pulse rate.
2.2 Working Principles
Oxygenated blood absorbs light
preferentially at 905nm (near
infrared light), whereas
deoxygenated blood absorbs light
preferentially at 660nm (red light).
A pulse oximeter works by passing
a beam of red and infrared light
through a pulsating capillary bed and then measure the amount of
red and infrared light emerging from the tissues via a sensor. To
Light Emitting
Diode
Light beams
sensor
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