Patient monitor is a device or system to measure and control patient physiological parameters, compare them with known set values, and send an alarm in case of exceeding the standard. The sensor senses various physiological changes, and then the amplifier strengthens the information and converts it into electrical information. The data is calculated, analyzed and edited by the data analysis software, and then displayed in each functional module in the display screen, or recorded and printed as required. When the monitored data exceeds the set index, the alarm system will be activated, Send a signal to attract the attention of medical staff.