Summary This article introduces the design method of the data acquisition terminal in the telemedicine system based on GPRS. The system is mainly composed of four parts: body temperature acquisition, ECG acquisition, main control circuit and Bluetooth communication module. In addition, there is a corresponding small amount of data processing software. The body temperature collecting part adopts NTC Thermistor as the sensor, and performs nonlinear compensation in hardware and software; the ECG collecting part uses metal plate electrode as the sensor, and amplifies and filters the collected ECG signal. And designed a digital filter to further filter the ECG signal, thereby obtaining a highly reliable ECG waveform; the main control circuit mainly includes real-time clock, data storage, liquid crystal display, low battery alarm and communication interface. The single chip microcomputer of the main control circuit adopts MSP430C1351 in the MSP430 series; the system is equipped with a liquid crystal display module, which can provide the user with real-time ECG waveform and body temperature; the data storage function can store the user's various physiological information for medical personnel to diagnose Reference; the system terminal can communicate with the monitoring center computer through the COM port and USB port. The Bluetooth communication module is used to collect data communication between the terminal and the GPRS module. This article also introduces software methods for processing data. In the processing of body temperature signals, a linear interpolation method is introduced for linear compensation; in the processing of ECG signals, a digital filter is designed to further filter and a method of ECG data compression is introduced. 1 Introduction Telemedicine refers to the use of information and telecommunications technology to exchange medical clinical data and expert opinions of patients who are separated from each other. Telemedicine includes telemedicine consultation, telemedicine education, and the establishment of a multimedia medical care consulting system. Telemedicine is the use of computers, communications, medical technology and equipment, through the long-distance transmission of data, text, voice and image data, to achieve a "face-to-face" consultation between experts and patients, experts and medical personnel. Telemedicine is not only a medical or clinical problem, but also includes communication network, database and other issues, and they need to be integrated into the network system. 1.1 The research purpose and significance of the subject With the improvement of people's living standards, the requirements for modern medical treatment are increasing; many diseases are more harmful and sudden, and the diseases are very random, and the timeliness of rescue is very high; at the same time, because of our country The population is large, the density is high, and the aging is serious. How to ensure people get proper medical care will be an urgent problem to be solved. The development of mobile communication technology has made us see the dawn of mobile medical technology. Just like the development of mobile communication technology, the development of remote mobile medical technology and related technologies will also enter a period of rapid development, and the technology will gradually mature and improve. Although wired transmission does not need to increase power during long-distance transmission, the cost is low, and it is convenient to use the existing telephone communication line to transmit signals and guide measurement. However, if telemedicine uses wired transmission technology, it will limit the activity of the measured object and bring users Come in great inconvenience. Moreover, with the acceleration of life rhythm and lifestyle changes, the use of cable transmission technology has been unable to meet people's needs. With the existing wireless network, this problem can be solved. It can send all the information of the monitored object to the monitoring center anytime and anywhere, and the monitoring center can make corresponding treatment according to the information. Telemedicine based on wireless networks will become the main form of telemedicine in the future. GPRS-based remote mobile medical treatment can monitor real-time outdoor objects and send real-time data to the monitoring center. At the same time, the medical information platform can also provide various medical services. Therefore, the monitoring and first aid system with wireless mobile communication function will play an increasingly important role in clinical medicine. The remote mobile medical system uses sensor technology and modern communication technology to continuously monitor various physiological parameters of the user in real time, and allows the collected parameters to be sent to the monitoring center. The system shortens the distance between doctors and patients. Doctors can also refer to the data returned to provide timely medical services for patients. The range of monitoring system can not only be limited to hospitals and other medical institutions, it can monitor any place reached by the communication network. Especially with the intensification of social aging, remote mobile medical treatment can solve this problem. The system monitors various physiological parameters of the elderly in real time and sends back the data. The medical staff in the monitoring center judges the elderly's physical condition based on the data and provides emergency services in an emergency. The remote mobile medical system is developed in accordance with social development and people's medical needs. With the development of various technologies, the telemedicine system will also have breakthrough development. 1.2 Development status of telemedicine at home and abroad Mobile medicine has been a research hotspot in the field of telemedicine in recent years, but it is a relatively weak link in telemedicine. It provides a method for studying the physiological functions of remotely moving objects through continuous monitoring of their physiological parameters [2]. Most of the domestic researches on telemedicine use telephone lines to transmit medical images or use the network for remote consultation. For example: "Heart BP machine" is also the use of fixed-line data transmission; the head of the technical department of Zhongwei Lai Kang Technology Development (Beijing) Co., Ltd. said that remote heart monitoring technology mainly consists of information collection, data transmission and data processing. Partial composition. The information collection technology is modified on the basis of traditional mobile devices based on mobile characteristics and is quite mature. Some people have been worried about whether the current network can accurately transmit the large amounts of complex data required for remote cardiac monitoring. In fact, this is no longer a technical problem in the current 2.5G network environment. Looking at the 3G network environment, the data transmission rate will be faster, the user will be more convenient to use, and the expected usage fee will also be cheaper. It can achieve the transmission of ECG data and other contents in an instant, thereby realizing long-term real-time monitoring of large amounts of data ; "CTTM-1000 Remote ECG Central Monitoring System" has been developed by Fuzhou University. The ECG monitoring and sending device on the user side is composed of wireless transmission and landline. It can work in the basic sound disaster and wireless transmission and forwarding working methods. By transmitting data through the telephone line, the patient's ECG can be monitored and dynamically analyzed, abnormal ECG can be stored and alarmed, and the patient can transmit the stored or real-time ECG signal at any time to the hospital monitoring center through digital modulation via the public telephone network [5]; In addition, the Ministry of Health of the General Logistics Department of the PLA has proposed the "three major projects" of the information construction of the military health system, and they are listed as the national "Golden Guardian Project" military projects 1, 2 and 3, of which The No. 2 project is to build a military medical and health information network and a remote medical consultation system; 1995 Shanghai Education and Research Network Shanghai Medical teleconsultation project started, and set up a telemedicine consultation lab. Shanghai Medical University has established and experimented with the first relatively complete telemedicine system model based on the Internet in China. The system model mainly uses a client / server framework structure, with a SYBASE database supporting distributed concurrency and multimedia processing as the main background. The database server uses the currently widely used desktop video conferencing system as the technical backbone of the remote expert consultation, and has achieved relatively successful experience in the experiment and promotion process. On January 12, 2006, the launching ceremony of "China's remote ECG monitoring network system" was held in the Great Hall of the People to solve the cardiovascular disease in China, reduce the incidence, recurrence rate, disability rate and mortality rate, and raise the awareness of universal health care [ 6]. In the 1960s, foreign countries began to conduct research on mobile medicine. United Airlines is putting into operation a remote medical system for trial operation, which provides a full range of vital signal detection, including heart, blood pressure, breathing, etc. During the flight, you can get timely medical support from all over the world through the mobile communication system; Greece also has a monitoring system installed in ambulances. It can get in touch with the hospital ’s monitoring center through the GSM network to monitor patient physiological parameters at any time and obtain timely Doctors guide to fight for rescue time. This system has been put into use in Greece, Sweden, Italy, Cyprus; a telemedicine team at Hokkaido University in Japan has studied a variety of mobile communication remote monitoring systems, which can be used in aircraft, ships, and ambulances. Patient monitoring under mobile conditions; Georgia Education Medical System (CSAMS) is currently the world's largest and most extensive tele-education and tele-medicine network, which can carry out wired, wireless and satellite communication activities, tele-medicine network is one of them portion. At present, telemedicine monitoring systems for families and individuals have become a hotspot in the field of medical technology. With the development and improvement of digital mobile communication technology, GPRS-based mobile medical will surely become an inevitable trend in the development of telemedicine, in people's daily lives The initiator plays a decisive role. 1.3 The content of this paper This paper mainly studies the data acquisition terminal part of the mobile medical system. The terminal is composed of five parts: ECG acquisition, body temperature acquisition, main control circuit, liquid crystal display and serial communication. The terminal is carried by the user and can monitor the physiological signal of the user at any time, and can be displayed in real time through the liquid crystal. This article discusses in detail the software and hardware design process of signal acquisition, the process of using data processing software to process physiological signals, and the design process of the main control circuit and peripheral circuits. In addition, the terminal is also equipped with RS232 port, USB port and Bluetooth communication module, which can facilitate reliable data communication directly with the monitoring center.
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