Biography
Enrollment Date: 2010
Graduation Date：2013
Degree：M.S.
Defense Date：2013.06.15
Advisors：Jiang Hanjun
Department：Institute of Microelectronics，Tsinghua University
Title of Dissertation/Thesis：Key Technology Study on the Wireless ECG Patch System
Abstract:
The conventional dynamic ECG, Holter, can have a 24-hour monitoring of ECG, but because of the weight, volume and complexity of the connection between the recorders and the electrode determine the subjects that it will seriously affect people’s daily lives. In addition, some Holter do not support real-time monitoring of the ECG signal over a long period of time, and some cannot store large amounts of Holter ECG data for later analysis, so the new type of portable monitoring system becomes very necessary to the people. Although there are many units in the country have been studied this technology, the main focus of their wireless ECG monitor research is concentrated on the Remote Data Service. These devices can achieve the 24-hour real-time monitoring hardly because wireless transmission of large amounts of data is a challenge to the power consumption of the system.
Therefore, this paper researches the Key technologies of a new type of Wireless ECG patch and focuses on the hardware technology design of ECG acquisition device, efficient signal processing technology and its embedded software implementation. The acquisition device selects the ADS1292 chip as an analog front-end, MSP430 MCU as a master, a low-power Bluetooth as the ECG transceiver module, and a Flash as ECG data memory. Firstly, hardware of the acquisition device is selected highly integrated, low-power chips as far as possible. Because we can use these to design a compact structure, small size, light weight device. The entire collection device looks like a Band-Aid which can be attached to the chest of the subjects to be monitored.
At the same time, in order to ensure that the system does not affect the daily lives of people for a long time, real-time monitoring, this paper presents A series of signal processing techniques for the system. And this paper proposes a new data processing algorithm to local process the ECG signals. And this algorithm is low computational, not complexity and the hardware overhead of the MCU is very small. It also contains the steps of the ECG signal for regularization. We can use the way to remove the interference of the original heart signals, thereby we can obtain a relatively clean and without distortion ECG. The algorithm also reduce the size of the effective dynamic range of ECG data, the wireless transmission of data is greatly reduced, so as to achieve the purpose of reducing power consumption. The algorithm also includes a rapid heart rate using ECG extraction method. The series of algorithms and collection device can be very easy to achieve for a long time real-time monitoring function.
Final, thesis work transplants the relevant Technologies to another new wireless health monitoring system, wireless heart sound monitoring system, in the study of wireless ECG patch. Based on the transformation of the ECG monitoring system hardware structure, this paper achieves a wireless heart sound signal monitoring system.