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With the continuous development of modern medical technology and the continuous research and development of medical equipment, medical monitoring equipment has become an indispensable type of instruments in medical electronic equipment and plays a crucial role in modern hospital treatment and monitoring. In addition to electrocardiogram and blood pressure, the measurement of oxygen saturation in the human blood is also very important in medical monitoring. So, what is the working principle of a SpO2 probe?

Introduction to the working principle of the SpO2 probe

The SpO2 saturation probe, also known as the SpO2 probe, is fixed on the patient's fingertip, using the patient's finger as a transparent container for hemoglobin to obtain physiological data such as spo2, pulse rate, and pulse wave. It is usually connected to the electrocardiographic monitor and is applied to monitor the patient's SpO2. Pulse SpO2 is a percentage value of the SpO2 content and capacity, and it is a safe, reliable, fast-acting, non-invasive continuous monitoring indicator that has been recognized by modern medicine.

Currently, it is widely used in surgery, PACU, ICU, and anesthesia. Based on the spectral characteristics of the oxygenated hemoglobin (HbO2) and the reduced hemoglobin (Hb) in the red and near-infrared regions, it can be known that HbO2 and Hb have a significant difference in absorption in the red light region (600-700nm). Oxygen saturation has a great impact on the light absorption degree and light scattering degree of blood. The light absorption degree and light scattering degree of blood are mainly affected by the hemoglobin content. Therefore, the difference in absorption spectrum between HbO2 and Hb can accurately reflect the saturation of arterial blood or venous blood in the blood vessel.

The pulse SpO2 is related to the R value

Because, in the pathway of light conduction, in addition to arterial blood hemoglobin absorption, other tissues (such as skin, soft tissue, venous blood, and capillary blood) can also absorb light. Light can be absorbed by pulsatile blood and other tissues at the same time, but the intensity of light absorbed by the two is different. The intensity of light absorbed by pulsatile arterial blood (AC) changes with arterial pressure waves. The intensity of light absorbed by other tissues does not change with pulsation and time. Therefore, the ratio of light absorption between two wavelengths can be calculated. Regarding the working principle and function of the SpO2 probe, we believe you have a general understanding after reading the above.

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