In the past, devices such as blood pressure monitors, electrocardiographs, and oxygen sensors have become new favorites in the consumer market. As these applications become mainstream, people's interest in patient monitoring is growing.

Home, hospital, and image processing diagnosis are the three fundamental categories in the electronic medical industry, and wearable devices can measure various important parameters. According to different needs, the position of the device on the body will significantly affect what can be measured and what cannot be measured.

First, let's popularize the relevant knowledge of blood pressure. Blood pressure is the source of power for blood to push through the arterial wall. Be aware that when the organs beat and contract, it will cause blood to flow through arteries in other parts of the body. This force exerts pressure on the arteries, known as systolic pressure. Uniform systolic blood pressure equal to or less than 120 millimeters of mercury. The lower value of arterial pressure is called diastolic blood pressure, and its reasonable value is equal to or less than 80 millimeters of mercury.

So far, the accurate monitoring of arterial blood pressure can only be completed through machinery and heavy medical equipment, and it should be tightly wrapped around your arm. But Maxim's comprehensive treatment plan provides the possibility of easier tracking of blood pressure.

The designer was able to develop a blood pressure diagnosis and processing plan through the reference design of maxrefdes220 #, which includes a intact integrated optical sensor module, a microcontroller sensor center, and a detection algorithm. The measurement method is to place your finger on the instrument for 30-45 seconds, allowing you to measure your blood pressure anytime and anywhere.

An integrated pulse and blood pressure measurement and heart rate monitoring module with low noise optical and electronic components, communication stopped through an I2C compatible standard interface.

The principle of pulse blood pressure measurement is to apply the ability of the blood to absorb light of different wavelengths, which depends on different concentrations of oxygen. The wavelength of adult hemoglobin is usually around 805 nanometers, and the wavelength changes with oxygen levels.

At present, the method for measuring the percentage of oxygenated red blood cells is to use a finger sleeve type photoelectric sensor. When measuring, just put the sensor on a human finger, use the finger as a transparent container for containing hemoglobin, use the red light with a wavelength of 660nm and the near-infrared light with a wavelength of 940nm as the incoming light source, measure the light transmission intensity through the tissue bed, calculate the hemoglobin concentration and oxygen saturation, and the instrument can display the human oxygen saturation, Provided a continuous non-invasive blood pressure measurement instrument for clinical use. This requires a microelectronic processing plan with low bias current, high impedance, and fast 16 bit performance to handle the output of photodiodes that detect these wavelengths. In the process of oversampling, filtering and signal processing, the low-level signal in the motion artifact is cleared to stop the pulse frequency measurement.

Derived from sensor and hub, it is specially used for finger measurement of blood pressure, heart rate and oxygen saturation SpO2. Separate the MAX30101 pulse oximeter and heart rate monitoring module, and provide the original data to the host device through its I2C using the BPT algorithm. This algorithm is integrated into an independent micro sensor hub, greatly simplifying product design and freeing the main system microcontroller from sharing resources and horsepower with the algorithm. This problem always brings great trouble to software engineers.

Thanks to the advancement of technology, medical health has become increasingly convenient. More precise patient orientation effectively reduces costs, enabling monitoring of patient conditions outside the hospital. This frequent response to one's own health situation can inspire people to work harder to adhere to their health habits.