• Title/Summary/Keyword: Mock Circulation System

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Design of a Hydrodynamic Mock Circulation System For Prosthetic Heart Valve Testing (인공심장 판막의 수력학적 특성)

  • Wetering, Jan E.v.d.;Suh, Soo-W.;Kim, Gi-J.;Chong, Chan-I.;Kim, Hee-C.;Kim, In-Y.;Min, Byoung-G.
    • Proceedings of the KOSOMBE Conference
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    • v.1993 no.05
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    • pp.146-151
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    • 1993
  • A new hydrodynamic mock circulation system was developed, which can test prosthetic heart valves of various sizes in order to obtain valve parameters, such as pressure drop, regurgitation and valve performance index with a high reproducibility. High reproducibility can be obtained only under equal testing conditions, i.e., the compliance, resistance and inertance of the mock circulation system must be constant parameter estimation using actual pressure and flow data was applied to calculate these systemic variables in order to adjust them to create the necessary equal testing conditions.

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Development of Intravascular Micro Active Endoscope(II) -System Design, Fabrication and In-vitro Evaluation- (혈관 삽입용 초소형 작동형 내시경의 개발(II) - 시스템 설계, 제작 및 체외 성능 분석 -)

  • Chang, Jun-Keun;Chung, Seok;Lee, Yong-Ku
    • Tribology and Lubricants
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    • v.15 no.3
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    • pp.278-286
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    • 1999
  • To predict the behavior of the intravascular micro active endoscope in the real human vascular system, a human mock circulation system was developed. The intravascular micro active endoscope which consists of micro active bending catheter and micro drug infusion catheter was driven in the velocity, Re number and temperature controlled flow. The three SMA (Shape Memory Alloy) zigzag type spring in the micro active bending catheter was heated by the electric current generated by PWM controller, and the shape memory effect made the actuator bend to any direction. The micro drug infusion catheter was driven through the inner hole of the micro active bending catheter. A mock circulation system is shaped from Ascending Arota to Femoral artery according to a human data (the data contains many vascular sizes and hydrographs of many control points). We developed a vascular model with glass and silicone tubes, and set the flow system with circulation parts, flow settling parts, and lots of valves. The heater and heat-controller was added to the How system to centre! the temperature of the How at 36.5$^{\circ}C$. The result showed that the developed intravascular micro active endoscope could be induced to any point in the vascular model.

Control of Left Ventricular Assist Device using Artificial Neural Network (인공신경망을 이용한 좌심실보조장치의 제어)

  • 류정우;김훈모;김상현
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.260-266
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    • 1996
  • In this paper, we presents neural network identification and control of highly complicated nonlinear Left Ventricular Assist Device(LVAD) system with a pneumatically driven mock circulation system. Generally the LVAD system need to compensate nonlinearities. Hence, it is necessary to apply high performance control techniques. Fortunately, the neural network can be applied to control of a nonlinear dynamic system by learning capability. In this study, we identify the LVAD system with Neural Network Identification. Once the NNI has learned the dynamic model of LVAD system, the other network, called Neural Network Controller(NNC), is designed for control of a LVAD system. The ability and effectiveness of identifying and controlling a LVAD system using the proposed algorithm will be demonstrated by computer simulation.

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Development of transcutaneous energy transmission system for implantable total artificial heart (인공심장용 무선에너지 전송 시스템의 개발)

  • 이우철;안재목;이상훈;민병구
    • 제어로봇시스템학회:학술대회논문집
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    • 1991.10a
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    • pp.762-767
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    • 1991
  • To make electromechanical total artificial heart implantable inside the body, transcutaneous energy transmission system was designed and simulated by using PSPICE program. The fabricated system was evaluated by using Mock circulation system and showed comparable performance with the D.C power supply

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Time-Varying Hemodynamic Characteristics Simulation using Computerized Mock Circulatory Loop System with Servo Flow Regulator

  • Moon, Youngjin;Son, Kuk Hui;Choi, Jaesoon
    • Journal of Biomedical Engineering Research
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    • v.36 no.6
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    • pp.264-270
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    • 2015
  • A mock circulatory loop system has been developed to construct a simulator for trainees in cardiopulmonary bypass systems or to simulate a test environment for cardiac-assist devices. This paper proposes a computerized mock circulatory loop system whose node is modularized by using a servo control flow regulator to simulate dynamic change of the hemodynamic status. To observe the effect of time-varying resistance, one with hemodynamic properties, the proposed system replicates the planned cross-sectional areas of the outlet of a ventricular assist device in terms of voltage input of a servo valve. The experiment is performed (1) for steady-input commands of selected area sizes and (2) for dynamic commands such as monotonous increase and decrease, and oscillatory functions of the voltage input, and a computer program based on LabVIEW (National Instruments, Austin, USA) processes every measured data and control command to the servo valve. The results show that the pressure and flow at the target points with respect to time-varying resistance match intuitive estimation: the pressure at the outlet and the pressure drop between both sides of the valve increased and the flow at the outlet decreased for increased resistance.

Development of Bubble Detector for Extracorporeal Circulation Support System (체외 순환 보조 장치 위한 공기방울 감지 장치 개발)

  • Lee, Hyuk-Soo
    • Journal of the Institute of Convergence Signal Processing
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    • v.11 no.4
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    • pp.298-302
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    • 2010
  • Extracorporeal circulation support system is a device for repiratory and heart failure treatment, and there have been many trials for development and clinical application in the world. These devices need to be careful while using is air embolism. Air embolism can be a lethal complication of surgical procedures during which venous pressure at the site of surgery is sub-atmospheric or air is forced under pressure into a body cavity or using extracorporeal circulation support system. To solve the problem, we developed the air detector using relative dielectric constant change. In experiments with a mock circulation system, the proposed system showed a signal difference depending on the amount of air in the tube.

Control of Left Ventricular Assist Device Using Neural Network Feedforward Controller (인공신경망 Feedforward 제어기를 이용한 좌심실 보조장치의 제어실험)

  • 정성택;김훈모;김상현
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.4
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    • pp.83-90
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    • 1998
  • In this paper, we present neural network for control of Left Ventricular Assist Device(LVAD) system with a pneumatically driven mock circulation system. Beat rate(BR), Systole-Diastole Rate(SDR) and flow rate are collected as the main variables of the LVAD system. System modeling is completed using the neural network with input variables(BR, SBR, their derivatives, actual flow) and output variable(actual flow). It is necessary to apply high perfomance control techniques, since the LVAD system represent nonlinear and time-varing characteristics. Fortunately. the neural network can be applied to control of a nonlinear dynamic system by learning capability In this study, we identify the LVAD system with neural network and control the LVAD system by PID controller and neural network feedforward controller. The ability and effectiveness of controlling the LVAD system using the proposed algorithm will be demonstrated by experiment.

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Control of Left Ventricular Assist Device using Neural Network Feedback Feedforward Controller (인공신경망 Feedforward제어기를 이용한 좌심실보조장치의 제어실험)

  • 정성택;류정우;김상현
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.150-155
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    • 1997
  • In this paper,we present neural network for control of Left Ventricular Assist Device(LVAD)system with a pneumatically driven mock cirulation system. It is necessary to apply high perfomance control techniques, since the LVAD system represent nonlinear and time-varing characteristics. Fortunately, the neural network can be applied to control of a nonliner dynamic system by learning capability. In this study,we identify the LVAD system with neural network and control the LVAD system by PID controller and neural network feedforward controller. The ability and effectiveness of controlling the LVAD system using the proposed algorithm will be demonstrated by computer simulation and experiment.

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인조신경망을 이용한 좌심실보조장치의 동적 모델링

  • 김훈모
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.04a
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    • pp.346-350
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    • 1996
  • This paper presents a Neural Network Identification (NNI) method for modeling of highly complicated nonlinear and time varing human system with a pneumatically driven mock circulation system of Left Ventricular Assist Device(LVD). This system consists of electronic circuits and pneumatic driving circuits. The initation of systole and the pumping duration can be determined by the computer program. The line pressure from a pressure transducer inserted in the pneumatic line was recorded. System modeling is completed using the adaptively trained backpropagation learning algorithms with input variables, Heart Rate(HR), Systole-Diastole Rate(SDR), which can vary state of system, and preload, afterload, which indicate the systemic dynamic characteristics and output parameters are preload, afterload.

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A study on the development of motor-driven artificial heart and its control (인공심장의 자동제어)

  • 민병구;김희찬;권성일
    • 제어로봇시스템학회:학술대회논문집
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    • 1986.10a
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    • pp.643-647
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    • 1986
  • A new type of motor-driven Total Artificial Heart (TAH) system with rolling-ball mechanism has been developed. To test its performance as a Left Ventricular Assist Device (LVAD), LVAD is controlled to bypass blood for impaired heart triggered by the R-wave in ECG. Results of the test with a Mock Circulation System (MCS) and an animal experiment with a dog are also included. More powerful system using a brushless DC motor has been developed and its control scheme is represented.

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