What is a monitor? It is a commonly used high-precision medical instrument for monitoring the patient's condition in the hospital. It mainly monitors the physiological parameters of the human body that the medical staff needs to pay attention to, such as body temperature, respiration, blood pressure, heart rate, pulse rate, etc., especially special care is required. The patient, the monitor is one of the essential medical instruments for assisted treatment. With the development of medical technology, instrumentation technology and hardware technology, the monitor has been greatly improved in both performance and appearance. The ability of real-time monitoring is getting higher and higher, and it also bids farewell to the inconvenient disadvantage of being cumbersome to use. . Today's monitors are generally capable of simultaneously monitoring a variety of physiological monitors (multi-parameter monitors), with many detection parameters, compact design, small size, and easy to carry. Since it is a medically common device, electronic engineers working in the medical industry can learn more about its basic knowledge and working principles. This paper summarizes the principle of the monitor, including the analysis of the principle of the monitor from its system structure, circuit structure, etc., and also analyzes the principle of monitoring various physiological parameters, and summarizes its application in medicine, hoping to give everyone a learning And research brings help and inspiration. The system structure of the monitor is shown in Figure 1: Figure 1 System structure of the monitor System structure of the monitor The role of each part: (1) Sensor - pick up the physiological or biochemical parameters of the human body, and secondly convert the picked physiological signals into corresponding electrical signal outputs. (2) Signal processing system - electronic circuit and digital logic circuit or microprocessor, etc., to realize the processing and judgment of the sensor signal and output the correct electrical signal that can be displayed on the display (3) Display device - pointer display, digital display, oscilloscope or signal light, etc. (4) Alarm device - two types of alarms, sound and visual, which automatically notify the medical staff when there is a crisis situation. (5) Control system - refers to electronic and mechanical automatic control circuits, such as the intake speed of oxygen tanks, the flow rate of droplets, etc. (6) Recording device - will monitor the data archive According to its system structure, we conclude that its general working principle is as follows: The system adopts various preset sensors to perform signal detection and pre-processing modules of physiological parameters to convert biomedical signals into electrical signals, and performs pre-processing such as interference suppression, signal filtering and amplification on the electrical signals output by the sensors in the signal processing system. , the electrical signal output after the secondary processing is obtained. Then, the data extraction and processing module performs sampling, quantification, and calculation and analysis of each parameter, and the result is compared with the set threshold in the alarm device whether the supervised alarm is performed within the safe monitoring range, and the result data is real-time through the recording device. The storage to the RAM allows the medical staff to better see the changes of the various parameters before the patient, and the data from the signal processing system can also be transmitted to the display device in real time, and the parameter values ​​can be displayed in real time on the display device. Just the parameters that need real-time monitoring and control can be achieved through the control system. 8 Inch Face Access Control,8-Inch Touch Screen Access Control Device,8 Inch Face Recognition Attendance Access Control,Face Recognition Attendance Access System Shenzhen BIO Technology Co.,Ltd. , https://www.hfsecuritytech.com![[Dry goods] monitor principle, circuit structure and its application analysis](http://i.bosscdn.com/blog/6.jpg)