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. Oxyhemo 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