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Research of Cardiovascular Diseases Forecating Method Based on Pulse Wave

Author: WangChao
Tutor: JinHaiLong
School: Yanshan University
Course: Biomedical Engineering
Keywords: cardiovascular pulse wave noninvasive embedded fuzzy theory
CLC: R318
Type: Master's thesis
Year: 2010
Downloads: 156
Quote: 1
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Abstract


Cardiovascular Disease is a serious disease which threatens human’s life and has become one of the most serious diseases which harms health and causes death in the world. If we can forecast the tendency of cardiovascular parameter timely and take the corresponding measure, it will reduce the rate of diseases greatly. The pulse wave which is human’s basic physiology signal implicates rich cardiovascular parameter and can be examined through the noninvasive method. Therefore, The method that to examine the pulse wave forecasts the cardiovascular disease becomes the focus which the people pay attention to.According to the pulse wave’s characteristics which are non-stability and disturbed easily and so on, the article has designed a gathering system based on embedded. It analyses and classifies the parameter of the pulse wave by the fuzzy theory. In the radial artery, the piezoelectricity thin-film sensor gathers the fluctuant signal and the system deals with the signal by low-pass filtering to eliminate the high frequency interference signal and deals with it by high-pass filtering to eliminate the baseline drift and deals with it by automatic gain control to satisfy the different people and deals with it by modulation level to achieve the unipolarity of the signal. According to the intelligentization, the micromation and the upgrade easily, the system has used the ARM7 microprocessor and the embedded operating systemμC/OS-II to achieve A/D transformation, the display of the signal, storage and communication and so on. Finally, to analysis the parameter of gathering signal that is the number of the peak, the slope of main wave and the width of 20% main wave classifies the heath and arteriosclerosis by fuzzy theory. The accuracy rate of the method can reach 80% by data verification and can forecast cardiovascular diseases.Each kind of interference factor can cause to change the pulse wave and affect the analytic result. Therefore, to take the test, the conner must maintain the stable of mood under the quiescent condition and the test is taken continuously for several minutes and we will intercept the stable wave to be analyzed. The pulse wave still contained many parameter and we need to research it further to excavate more information and to enhance the accuracy rate.

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