• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.43-45
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• 2007

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.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 심포지엄 논문집 정보 및 제어부문
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• pp.48-50
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• 2005

Urodynamics describes a collection of tests designed to evaluate lower urinary tract function and can be performed using retrograde filling of the bladder within a room. In this study, we designed and calibrated the potable urodynamics monitoring system using DSP chip (TMS320VC33, Texas Instrument$^{TM}$, U.S.) and collected pressure and EMG using calibration kit (DPT9022K0122, Medtronics$^{TM}$, U.S.). This system can make patients more comportable and monitor spontaneous urination during daily life.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.379-381
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• 2005

Urodynamics describes a collection of tests designed to evaluate lower urinary tract function and can be performed using retrograde filling of the bladder within a room. In this study, we designed and calibrated the potable urodynamics monitoring system using DSP chip (TMS320VC33, Texas InstrumentTM, U.S.) and obtained signals of bladder(Pves) and bladder neck pressure(Pneck) and EMG using calibration kit (DPT9022K0122, MedtronicsTM, U.s,). This system monitor spontaneous urination during daily life and can make patients more comportable.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.46-48
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• 2007

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 $y=0.0014x^2$+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.

• 전기학회논문지
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• 제56권7호
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• pp.1339-1342
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• 2007

In this study, we determined the optimum electrode pair for measuring the abdominal pressure using bio-impedance method and compared with 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 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 $y=0.0014x^2+0.0620x+0.6958$, respectively. It demonstrated that the abdominal pressure could be measured noninvasively 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.

• 전기학회논문지
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• 제56권6호
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• pp.1170-1176
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• 2007

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 $y=0.0014x^2+0.0620x+0.6958$, 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.

• 전자공학회논문지SC
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• 제45권6호
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• pp.132-140
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• 2008

복압 측정을 위한 기존의 카데터 방법은 배뇨압에 영향을 줄 수 있는 많은 오차를 유발할 수 있으며 환자에게 불편함을 야기한다. 이러한 문제점을 해결하기 위해, 본 연구에서는 표면 근전도를 이용하여 비침습적으로 복압을 측정할 수 있는 새로운 방법을 개발하였다. 연구 결과, 기존 직장 카테터를 이용하여 측정된 복압과 복압측정 알고리즘을 이용하여 추정된 복압 간의 상관계수는 $0.79{\pm}0.06$이었으며, 두 신호간의 오차는 $0.10{\pm}0.07$이었다. 본 연구에서 개발된 복압추정 알고리즘을 이용하면 휴대용 요역동학 검사 시 편리하게 간접적으로 복압을 측정할 수 있을 것으로 생각된다.

• 센서학회지
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• 제15권6호
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• pp.449-456
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• 2006

The purpose of urodynamic investigation is to obtain the information on the function of the urinary system. The aim of this study is to acquire the useful information of lower urinary tract symptom (LUTS) diagnosis through void force signal as noninvasive method. The system which could evaluate the function of compensatory hypertrophy with noninvasive and comfortable method was implemented to measure uroflow and void force during urination. The implemented system composes of the sensor parts, signal conditioning parts and PC monitoring program. For the evaluation of the implemented system, the simulation of control part of the system was performed and the model system for the lower urinary system was designed. The superiority of a measuring characteristic of the implemented system was verified using the model system. From the evaluation of the model system, we have found out that the void force was dependent on the occlusion degree and compensatory hypertrophy significantly.

• 융합신호처리학회논문지
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• 제8권1호
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• pp.6-14
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• 2007

요역동학검사는 하부요로계의 이상증상을 진단하기위하여 수행된다. 일반적으로 임상에서 행해지는 요역동학검사에서는 침습적인 방법으로 방광을 채운 후 배뇨하는 절차를 거친다. 하지만 이러한 방법은 카테터를 삽입해야하므로 환자에게 고통을 수반하게 한다. 본 연구에서는 비침습적이고 보다 편리한 방법으로 하부요로계의 기능을 평가할 수 있는 시스템을 구현하고자 하였다. 비침습적인 방법으로 하부요로증상(lower urinary tract symptoms, LUTS)의 진단을 위하여 배뇨시 요속, 요류음, 비침습적 방광내압을 측정할 수 있는 시스템을 구현하였다. 구현된 시스템은 센서부, 신호처리부, FPGA를 이용한 시스템 제어부 그리고 PC모니터링 프로그램으로 구성하였다. 그리고 구현된 계측시스템의 평가를 위하여 FPGA 시스템 제이부의 시뮬레이션을 수행하였고 인체의 하부요로계를 모식화한 실험장치를 구현하였다. 실험장치를 이용한 측정부의 평가결과 요속측정부의 평균에러율이 1.08%, 계수변화율이 1.48로 평가되었다. 그리고 비침습적 방광내압부는 평균에러율이 2.41%, 계수변화율이 2.81로 나타났다. 요류음신호의 시간영역과 주파수영역에서의 분석위해 평균실효치전력(average RMS power)과 주파수영역에서의 중심주파수(median frequency, MF)를 분석하였으며, 그 결과 $60{\sim}160Hz$의 중심주파수대에서 폐색을 가장 잘 반영하였다.