本文選題：膈肌肌電 + 信號采集　； 參考：《華南理工大學》2015年碩士論文

【摘要】：表面肌電是神經(jīng)系統(tǒng)電活動在皮膚表面處的綜合疊加表現(xiàn),蘊含著肌肉、神經(jīng)的功能狀態(tài)信息。隨著現(xiàn)代科學技術的迅速發(fā)展,人們對肌電信號有了更深入、更準確的認識,肌電信號被廣泛應用于基礎醫(yī)學研究、康復工程、臨床診斷等眾多領域。膈肌是人體最主要的呼吸肌,其肌電信號在一定程度上能反映呼吸系統(tǒng)的功能狀態(tài),在臨床醫(yī)學領域上的呼吸疾病診斷、呼吸功能監(jiān)控與評價等發(fā)揮著重要的作用。本論文將根據(jù)肌電信號的特點,設計一個基于表面電極的膈肌肌電采集系統(tǒng)。由于肌電信號本身是一種微弱的電信號,在采集時極易受到其他干擾信號的影響,因此設計一個高抗干擾能力的電路是本次設計最先考慮的問題。本文采用LF347運算放大器構成前置差分放大電路與右腿驅(qū)動電路,有效地抑制共模干擾。同時設計了高通濾波器、低通濾波器和50Hz的工頻陷波器,濾除信號中的高、低頻噪聲和工頻噪聲。對采集電路輸出的信號進行A/D轉換,運用數(shù)學形態(tài)法對信號進行濾波處理,濾除心電干擾。最后在時域和頻域上分別計算出膈肌的肌電強度與中值頻率,將處理的結果應用到實際臨床中,包括呼吸機風機的觸發(fā)控制與膈肌的疲勞診斷。
[Abstract]:Surface electromyography (EMG) is a comprehensive superposition of nervous system electrical activity on the skin surface, which contains the functional state information of muscle and nerve. With the rapid development of modern science and technology, people have a deeper and more accurate understanding of EMG signals. EMG signals are widely used in basic medicine research, rehabilitation engineering, clinical diagnosis and many other fields. Diaphragm is the most important respiratory muscle in human body. Its electromyography can reflect the functional state of respiratory system to a certain extent. It plays an important role in the diagnosis of respiratory diseases and the monitoring and evaluation of respiratory function in the field of clinical medicine. In this paper, a diaphragm electromyography acquisition system based on surface electrode is designed according to the characteristics of EMG signal. Because EMG is a kind of weak electrical signal, it is easy to be affected by other interference signals when it is collected. Therefore, designing a circuit with high anti-interference ability is the first problem to be considered in this design. In this paper, LF347 operational amplifier is used to construct predifferential amplifier and right leg drive circuit, which can effectively suppress common-mode interference. At the same time, high pass filter, low pass filter and 50 Hz power frequency notch filter are designed to filter the high, low frequency and power frequency noise in the signal. The output signal of the acquisition circuit is converted by A / D, and the signal is filtered and processed by mathematical morphological method to filter out the ECG interference. Finally, the myoelectric intensity and median frequency of diaphragm were calculated in time domain and frequency domain respectively, and the results were applied to clinical practice, including trigger control of ventilator fan and fatigue diagnosis of diaphragm.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：R741.044;TN911.7

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本文編號：2093431