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비침습적 복압 측정을 위한 생체 임피던스 전극의 최적 위치 선정
안양수(Yang-Su An),김거식(Keo-Sik Kim),송철규(Chul-Gyu Song) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
In this study, we determined the optimum electrode pair for measuring the abdominal pressure using bio-impedance method. Because impedance changes differ from a weight, a height, contractile force, volume of muscle and blood other or whatever of individuals, it was quantified using values of impedance change, correlation coefficient and SNR. Our results showed the optimum electrode pair (1, 9) which could detect impedance changes due to an increase of the intensity of the abdominal pressure. The correlation coefficient and quadratic function between the RMS values of EMG and the impedance changes were 0.87 and y=0.00l4x²+0.0620x+0.6958, respectively. It demonstrated that the abdominal pressure could be measured non-invasively and simply using bio-impedance method. We propose that this optimum electrode configuration would be useful for future studies involving the convenient measurement of abdominal pressure by ambulatory urodynamics monitoring study.
김거식(Keo-Sik Kim),안양수(Yang-Su An),송철규(Chul-Gyu Song) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
We developed a portable urodynamics monitoring system using personal digital assistance (PDA) and proposed a new method for measuring the abdominal pressure in non invasive mode using surface EMG signals. This system is consisted of a signal conditioning and control module and could measure the vesical, abdominal and detrusor pressure. The result showed a high correlation coefficient between the practical abdominal pressure, using a conventional rectal catheter and the estimated values, by our proposed algorithm (r=0.81). This system should prove a useful tool in the future evaluations of ambulatory urodynamics monitoring study.
徐正煥(Jeong-Hwan Seo),金巨植(Keo-Sik Kim),安洋洙(Yang-Su An),金敬燮(Kyeong-Seop Kim),宋哲奎(Chul-Gyu Song) 대한전기학회 2007 전기학회논문지 Vol.56 No.6
The conventional urodynamic monitoring is fulfilled by artificially filling a bladder with saline. Generally, it is difficult to evaluate the physiological functions of the storage and voiding of a bladder. With this aim, we constructed an ambulatory urodynamic monitoring (AUM) system and proposed a novel method estimating abdominal pressure by measuring bio-impedance variations. Our system was clinically evaluated for 10 patients. It turned out to be that as the intensity of the abdomen contraction increased, the amplitude of bio-impedance signal and the RMS value of EMG increased more as compared to those who observed during the rest mode. Also, we determined the optimum electrode pair for estimating the abdominal pressure using bio-impedance method and consequently compared with the conventional methods. Because impedance changes differ from a weight, a height, contractile force, volume of muscle and blood other or whatever of individuals, it was quantified in terms of impedance change, correlation coefficient and SNR. Our results showed the optimum electrode pair (1,9) which could detect impedance changes due to the increase of the intensity in the abdominal pressure. The correlation coefficient and quadratic function between the RMS values of EMG and the impedance changes were 0.87 and y=0.00l4x²+0.0620x+0.6958, respectively. Thus, our system demonstrated that the abdominal pressure could be measured noninvasively and conveniently by simply estimating bio-impedance values. We propose that this optimum electrode configuration would be useful for the future studies involving the handy measurements of abdominal pressure with our suggested ambulatory urodynamics monitoring system.
송철규(Chul-Gyu Song),서정환(Jeong-Hwan Seo),한상형(Sang-Hyung Han),김거식(Keo-Sik Kim),안양수(Yang-Su An) 대한전기학회 2009 전기학회논문지 Vol.58 No.6
Spasticity is a velocity-dependent stretch reflex disorder of the body motor system developing after the injury of the central nervous system, in which certain muscles are continuously contracted involuntarily. Conventional methods such as the modified Ashworth scale, Spasm frequency scale, pendulum test and isokinetic dynamometer had some disadvantages: limitation in discriminating the increase of resistance, immovable and expensive device, not enough study parameters. Therefore, it is necessary to introduce clinically more useful instrument, which can produce objective data and are more convenient on spasticity measurement. Spasticity measuring methods were reviewed and a new measuring instrument was designed and introduced. The new measuring system is a portable spasticity-measurement system, which encompass various scopes of spasticity-related human signals such as electrophysiologic, kinematic and biomechanical data. Our device was designed in order to measure the joint angle, angular velocity, electromyographic signals and force. We suggest that this new system can diagnose the spasticity of the muscles, objectively.