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Remote medical monitoring system based on single chip and FPGA

Date: Jun 19, 2020

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The telemedicine monitoring system is a high-tech industrial product that integrates information science, computer technology and communication application technology in the medical and health field.

Remote medical monitoring system based on single chip and FPGA

1. Design Purpose

With the rapid development of electronic information, in recent years, remote medical monitoring technology has gradually become a hot spot in the medical community. The remote monitoring of important life parameters brings convenience to the elderly and infirm, and also makes a great contribution to the development of the modern medical community.

The telemedicine monitoring system is a high-tech industrial product that integrates information science, computer technology and communication application technology in the medical and health field. The main components of the system are: based on the microcontroller and sensor nodes to form a sign collection module, a wireless transceiver module based on GPRS/GSM, and a host computer monitoring module based on FPGA. The sign collection module uses various special sensors to collect body signs, which are processed and packaged by the microcontroller, and uploaded to the upper computer monitoring center via the GPRS/GSM communication network. The remote doctor/guardian can monitor the patient regularly/real-time. The system has accurate measurement, strong practical innovation, high cost performance, and has a very good promotion value.

2. Design requirements

Design a remote medical monitoring system. Claim:

1. Accurately collect each sign signal through each sensor node and submit it to the 89c51 single-chip microcomputer for processing, calculate each sign information (including body temperature, blood pressure, pulse, heart rate), form a sign collection sub-module to complete the collection of each sign information, And upload to GPRS/GSM wireless module.


2. The GPRS/GSM wireless module will receive the sign information and send it to the upper monitor accurately.


3. The upper computer based on FPGA receives the information of the lower computer, and analyzes and controls it.


3. Design equipment


1. Various types of sign sensors (ASDX100 pressure sensor, HK-2000B pulse sensor, DS18B20 temperature sensor);


2. Microcontroller, GPRS/GSM module, FPGA development box;


3. Several tweezers, pliers, resistance and capacitance potentiometer wires, etc., and several solders.


4.the design principle and design plan


1. Design principles


The remote monitoring system can be defined as a technical means to transmit the remote physiological signs and medical signals to the upper computer monitoring center through wireless communication technology for analysis and give diagnosis opinions.


(1) Principles of medical monitoring


Remote monitoring of important life parameters is an important part of the routine monitoring of the elderly and frail. The physiological information detected mainly includes: body temperature, pulse, blood pressure, heart rate, electrocardiogram, breathing, blood gas (oxygen partial pressure and carbon dioxide partial pressure), blood Oxygen saturation, blood sugar, etc. Such physiological parameters generally require noninvasive or minimally invasive detection in remote monitoring systems. This article takes temperature, pulse, blood pressure and heart rate signals as the acquisition objects, and selects simple and convenient sensors and non-invasive measurement methods.


(2) Wireless communication technology


With the continuous development of information technology and the growth of social demand, wireless communication has entered a stage of large-scale development. Rapidly developing wireless communication has become the most dazzling "bright spot" in the information industry, providing various potential engineering technologies. New methods and means, and become a strong driving force to promote social development. Wireless communication shows its broad market prospects due to its features such as no need to set wires and convenient use. Wireless communication technology is entering many products at a faster speed. Compared with wired, it mainly has the advantages of low cost, convenient portability, and eliminating the trouble of wiring. It is especially suitable for remote control, telemetry, wireless meter reading, access control system, cell pager , Industrial data collection systems, wireless tags, identification, non-contact RF smart tablets, small wireless data terminals, security fire protection systems, wireless remote control systems, biological signal collection, hydrological and meteorological monitoring, machine control, information appliances, wireless 232, wireless 422 /485 data communication and other fields. Using GPRS/GSM technology for wireless communication, the traditional serial communication is expanded to GPRS/GSM wireless network communication, which can send the collected data to the host computer in real time, realizing the timely exchange of data and fast wireless networking of serial device.


2. Design plan


(1) Hospital monitoring network system plan


The hospital monitoring system is composed of wired network (local area network) and wireless network, as shown in Figure 4.1. The collection terminal worn on the patient sends the collected physiological information data (body temperature, pulse, blood pressure, heart rate) to the AP (Access Point). The AP forwards the data to the host monitoring machine through the hospital's local area network, and the host monitoring machine analyzes and processes the data.


After the AP is powered on, it immediately attempts to connect to the server on the LAN. The server's IP and port number and the AP's network configuration are written in the configuration file. The user can manually modify it and enter the ready state after the connection is successful.


If a patient with a mobile monitoring device enters the coverage area of the AP, the mobile monitoring device will query the AP and establish an ACL link with it. The AP accepts the connection and will perform a master-slave switch to ensure that the AP can continue to be the master unit of the sensor network. Discovery and chain building of other mobile monitoring equipment. After that, SDP, L2CAP, and RFCOMM connections are made between the mobile monitoring device and the AP. The AP reports to the server that a mobile monitoring device has entered the area, and thereafter the AP will transparently forward bidirectional data between the AP and the mobile monitoring device. The host computer can complete the control and data collection functions through the AP and mobile monitoring device serial replacement functions. When the patient leaves the coverage area of this AP, the link is broken, and the AP reports to the server that the mobile monitoring device has left the area, and at the same time, the mobile monitoring device carried by the patient starts searching for a new AP. According to which AP the mobile monitoring device is connected to, the medical staff can know the patient's activity in the whole ward.


(2) Family monitoring network system solution


The wireless system is mainly composed of various sensor nodes (pulse, body temperature, blood pressure, heart rate and other sensor nodes), several wireless nodes with routing functions, and a central network coordinator (monitoring base station equipment). The monitoring base station equipment connects the wireless network and Ethernet, is the core part of the home wireless network, and is responsible for the management of sensor network nodes and equipment nodes. Various sign data are transmitted to the remote monitoring server through the home gateway. The remote monitoring server is responsible for the real-time collection, display and storage of pulse physiological data. Hospital monitoring centers and doctors can log in to the monitoring server to view the physiological information of the monitored person, and can also remotely control the sensors and devices in the home wireless network, so that when the monitored patient has abnormalities, it can detect and take rescue measures in time. The relatives of the guardian can also log in to the guardianship server to know the health status of the guardian at any time.


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