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      • A FREE BREATHING IMPEDANCE RHEOGRAM APPARATUS MADE OF MICROPROCESSOR

        Hua, Feng Jian,Chao, Zhang Xin,Wei, Zheng,Xuan, Jin Pei,Qiou, Bai Yan 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1

        The impedance rheogram is a modern non-invasive method used to observe the disease of each part of the body such as heart, liver and lung etc. Because of the breathing interference effect, the patients have to hold their breathing when they are being tested by conventional impedance rheogram apparatus. It is not convenient to observe those patients who are difficult to cooperate with doctor such as children and poor-function-heart patients. Therefore, we have developed the free breathing impedance rheogram apparatus by using microprocessor, it can effectively eliminate the interference of the breathing to impedance rheogram, so that patients can be tested in the free breathing. By this way, it can not only much improve measuring accuracy, and also extend clinical service extant. The digital filtering system that we have developed by using microprocessor is used for automatically tracking variation of rhythm of the heart by specific program and filtering interference of the breathing by in-phase superposing-averaging the impendance signal of the lung in free breathing. The present artical introduces the hardware structure and main technical targets of the free breathing impedance rheogram apparatus, and provides application results for grown-up healthful persons and the patients having heart or lung problems in clinical service. The results show that the effect filtering interference of the breathing to impedance rheogram is very obvious. This technique can be used In impedance rheogram of heart and liver etc, and lays down a foundation for developing monitor in clinical service. In addition, it can also be used in studying of sport-medicine and space-medicine. This result has gotten United States Patent on Jun. 25,1991.

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