Rising posture: refers to how the blood oxygen meter works!

At the time of the outbreak, many related medical devices and protective equipment have become a hot product, pulse oxycometer is one of them, a common symptom of new coronary pneumonia patients is "lower blood oxygen content", so oxyoxometer as a self-screening option, sales continue to rise.Since it is blood oxygen measurement, have you ever thought about how we get the "blood oxygen" measured every day? What about the data we measured? How to make better use of the finger oxygen meter to monitor the patient's blood oxygen?Today, Berry small editor to give everyone a rising posture:what is a pulse oxycodone?
Pulse oxygen meters provide a method for measuring blood oxygen saturation or arterial hemoglobin saturation in a noninvasional manner. The pulse oxygraph can also detect arterial pulsations, so the patient's heart rate can also be calculated and communicated. Pulse oxyoxometer is a medical device that measures the amount of oxygen in the blood of a patient's arteries.

➤
SpO
2
x oxygenated hemoglobin capacity / all binding hemoglobin capacity ×100% ➤
SpO
2
s HbO
2
/ (HbO
2
sHb) ×100% ➤
except
HbO
In addition to

and
Hb
,
actually has many other proteins in the body that can bind to oxygen, but the
ratio in normal people is relatively small
and is not closely related to tissue oxygen supply, so most oxygen meters simplify spO2 calculations to
and only calculate
these two
parameters
.Measurement Principle
➤
has a luminescence source that emits two wavelengths of light, and HbO
2
and Hb have different
absorptions of these two wavelengths
.➤
artery throbbing, the blood volume of the measuring site changes,
forming a certain waveform
, which means that the oxygen meter calculates SpO
2
based on
waveforms and absorption
.➤
addition to arteries, veins and surrounding soft tissue absorb light waves from light emitters, which is a "background noise" for arterial
oxygen
.➤
arteries have obvious throbbing, the opposite receiver received the light strength will appear with the artery's throbbing
guang strength periodic changes
, the oxygen meter can determine which light strength by the arteries Hb and HbO
2
absorption, so as to calculate SpO2 through the formula.➤
, try to choose soft
tissue thinner, arterial blood flow is rich
parts, such as hands, toes, earlobes.
Blood Flow Perfusion Index PIBlood Flow Perfusion Index
based on the throbbing waveform in the figure above,
reflects the blood flow perfusion at the point measured by the monitor. The higher the PI measured at the measuring point, the more accurate the spO
2
measured.
Factors that affect accuracyWhen the principles are described earlier, it is found that the hemoxometer assumes that only Hb and HbO
2
in the arterial blood change with the volume of the blood vessels, while the veins are stationary. However
model is ideal, the reality is bone-
. The accuracy of the oxygen meter is affected by many factors:interference (finger shake, etc.), ambient light, optical detection circuits, etc.Therefore,
wait a few
, the pulse waveform stabilizes and the reading is more accurate.Suitable measurement range ➤
usually blood oxygen within 70%-100%, accuracy of up to ±2% to ±3%.➤
SpO2 as low as 50%, the measurement accuracy is about ±10%today's consumer oxygen meters are more focused on smart wear and professional fitness expansion, while professional medical oxygen meters prefer high-precision measurement, data monitoring and early warning. Berry oxygen meter, pay more attention to high precision, high quality, multi-functional. Berry Bluetooth Oxygen Meter, which connects to the Blood Oxygen app, allows you to view and analyze monitoring data on your phone! At present, the company is also stepping up production, urgent customer urgency, for the world's epidemic prevention and control out of a force! (Shanghai Berry Electronics Technology Co., Ltd. public number)