1. Application requirements The clinical help call (monitoring) is an important means of transmitting clinical information. The ward call system is an emergency call tool for patients to request on-duty doctors or nurses for diagnosis and care. It can quickly transmit patient requests to the on-duty doctors or nurses in the duty room An accurate and complete record is left on the computer of the monitoring center, which is one of the necessary equipment to improve the level of care in hospitals and wards. The quality of the call system is directly related to the safety of the patients, and has always been widely valued by major hospitals. That is to say, regardless of whether the patient is in the ward or outdoors, when abnormal conditions occur, they should be treated in time. Therefore, the calling system must be timely, accurate, reliable, and simple. Second, the status quo of development The traditional ward call (monitoring) system generally uses a wired call system, which is installed on the bedside equipment and communicates with the host through buttons. This kind of system not only has complicated wiring and installation, inconvenient maintenance, low utilization rate, but also has poor real-time performance. Although the wireless calling (monitoring) system has no wiring problems, its reliability is poor, and radio waves can interfere with other medical equipment. At present, most hospitals do not use such wireless calling systems. 3. Advantages of applying Zigbee technology The wired ward calling system is very inconvenient for some patients who often need to move and those who need temporary extra beds. Therefore, we need to use a wireless data transmission method to deal with, it becomes more convenient. This requires that the wireless system should be timely, accurate, reliable, anti-interference, simple and feasible. With the continuous development of wireless communication technology, in recent years, the technology for wireless networking of low-cost devices has emerged-ZigBee, which is a close range, low complexity, high reliability, low power consumption, low data rate, low The cost of two-way wireless communication technology is mainly suitable for automatic control, remote control field and home equipment networking. The advantages of applying ZigBee wireless technology to the wireless communication of the ward call system are mainly reflected in the following aspects: 1. Real-time monitoring In the actual situation of the hospital, patients with severe illness may have lesions at any time, so it is necessary to call the system with real-time monitoring function. Our company's ZigBee wireless technology fully meets the needs of this real-time online monitoring. No matter where the patient is in the hospital, when there is a sudden lesion, the ZigBee wireless pager worn on the patient can send the automatic result detection result to the hospital emergency center, so that the patient can get timely assistance and protect the patient Life safety. 2. Low cost To realize the hospital's wireless call system, a network that can cover the entire building area of ​​the hospital needs to be formed, and a wireless caller must be worn on each patient. Therefore, the construction cost is quite high, and the one-time investment cost we use ZigBee networking technology is very low, and the operating cost is almost no. 3. Flexibility of networking The size of the network is determined by the number of patients, so the system's networking must be flexible. When the number of patients increases or decreases, the ZigBee wireless network can also flexibly increase or decrease the pager without complicated parameter setting work. 4. Low power consumption Because the wireless call module is worn on the patient, it is not realistic to use a wired power supply. The use of battery power requires the caller to have the advantage of low power consumption, so as to ensure that the patient's situation is sent to the relevant department in a timely and accurate manner, reflecting the advantages of the on-line call system. The dotted call module of ZigBee technology can run for about 2 years using the button battery power supply, which greatly meets the system's requirements for low power consumption. 5. Large network capacity A ZigBee network can accommodate up to 254 network nodes and a network coordinator, and more than 200 ZigBee networks can exist simultaneously in an area. This will undoubtedly bring great convenience to the future development and expansion of the hospital. Fourth, ZigBee-based hospital call system wireless communication network Through the previous analysis of the communication technology requirements of the patient monitoring system, combined with ZigBee technical characteristics and technical advantages, we use the ZigBee technology wireless data communication system to realize the hospital ward call system is a very ideal wireless data communication solution. 1. The call nodes in the room are connected by a star network, and one of the nodes acts as a ZigBee router, which is responsible for connection with the central network and data relay and forwarding; 2. The wireless call system must be used for inpatient wards, physical therapy rooms, emergency wards, infusion rooms, and toilets; 3. The wireless call system can use the handle button to facilitate the use of the call system for patients with physical inconvenience; 4. Optional mobile receiver is available. Nurses can use mobile receivers to receive related information when they are not in a fixed position or moving. Nurses can also use mobile receivers on duty. 5. All ZigBee routers form a cellular mesh network, and then connect with the ZigBee central node. The central node is set in the management center to build a complete ZigBee wireless network, which is a very reliable communication network structure. Wuxi Lerin New Energy Technology Co.,Ltd. , https://www.lerin-tech.com