Blood oxygen saturation is the percentage of the capacity of
HBO2 in the blood which is combined with oxygen in the total
capacity of Hb. That is, the concentration of blood oxygen,
which isavery important physiological parameter of the
respiratory and circulatory system. Many respiratory
diseases can cause the decrease of oxygen saturation. In
addition, the dysfunction of the body's automatic regulation
caused by anesthesia, surgical trauma and some injuries
caused by medical examination may lead to the patient's
oxygen supply problems and reduce the human oxygen
saturation, resulting in some adverse reactions such as
vertigo, vomiting, weakness and other symptoms. If the
treatment measures are not taken in time, the patients' lives
will be endangered. Therefore, it is very important for doctors
to find out the problem in time by knowing the patient's
oxygen saturation in time.
◆The finger clip type pulse oximeter (hereinafter referred to
as the oximeter) has the advantages of small volume, low
power consumption, simple operation and convenient
carrying. When measuring, as long as the finger is extended
into the finger clamp photoelectric sensor, the display screen
will directly display the measured blood oxygen saturation
value.
◆The measurement principle of the oximeter is based on the
spectral characteristics of hemoglobin and oxyhemoglobin
with different absorption rates in the red and infrared light
areas, and the empirical formula of data is established by
using "lamert beer" law. The working principle of the
instrument is to use photoelectric blood oxygen detection
technology combined with volume pulse tracing technology.
Two different wavelengths of light (660nm red light and
940nm near-infrared light) are used to irradiate the fingernail
of human body through absorption perspective clip sensor,
and the measurement signal is obtained by the photosensi-
tive element. The obtained information is displayed on the
◆Measurement principle
Summary
1
