Three-in-one lamp beads applied in heart rate blood oxygen health monitoring earphones

With the acceleration of the pace of life and the increase of work pressure, more and more people begin to pay attention to fitness. As a result, wearable fitness tracking devices have become very popular. Through the research on the principle of pulse oximetry, it has been found that the blood oxygen saturation can be calculated as long as the light intensity variation of two wavelengths of transmitted light in a complete pulse wave is measured. The heart rate sensing signal receiving chip can accurately measure information such as pulse waveform, heart rate value, blood oxygen value and vascular microcirculation parameters. The app can send data to the cloud, and use the "cloud" big data analysis technology to provide more information, such as blood pressure trends, respiratory rate, heart rate variability and other human health indicators.

The ear is second only to the fingertips and the place with the most abundant capillaries. Compared with the wrist, the optical measurement solution will make it easier to get high-quality PPG signals from the earphones, which is more conducive to more accurate exercise heart rate and blood oxygen. Effect test. Blood oxygen saturation (SpO2) is the percentage of the capacity of oxygenated hemoglobin (HbO2) in the blood to the total hemoglobin (Hb) capacity that can be combined, that is, the concentration of blood oxygen in the blood, which is an important physiological function of the respiratory cycle. parameter.
Heart rate and blood oxygen saturation are important indicators of human health parameters. Real-time monitoring of the dynamic changes of the two can provide a scientific guarantee for preventing the occurrence of diseases. Integrated into the earphone, the heart rate sensor signal receiving chip can track the time of exercise, monitor the heart rate during exercise, continuously monitor the pulse wave in static state, analyze the waveform, compare the data, and realize the early warning function of cardiovascular and cerebrovascular diseases.
The signal processing circuit processes the signal from the sensor, and the signal is amplified and filtered to obtain a signal with a certain amplitude. This signal is sent to the A/D conversion circuit to realize the conversion from analog to digital, and the digitized signal is calculated by the single-chip microcomputer according to the blood oxygen algorithm to obtain the blood oxygen saturation.
There are abundant capillaries inside the human auricle, the internal carotid artery system runs vertically along the ear canal area, and the capillary system runs through the tragus and earlobe. Moreover, since the skin of the ear is relatively thin, the stable absorption of the light beam by the non-blood tissue of the skin is reduced, the loss of light intensity is low, and the signal-to-noise ratio of the collected signal is improved.
In addition, after wearing the earphones, the heart rate sensing signal receiving chip will be closely attached to the auricle. Even when people engage in various sports, the ear position remains relatively stable. Therefore, the signal collected at this position has strong anti-interference performance, high stability, and is easy to carry.