• Title/Summary/Keyword: transcutaneous transmission

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Implementation of a Transcutaneous Power Transmission System for Implantable Medical Devices by Resonant Frequency Tracking Method (주파수 추적 방식에 의한 이식형 의료기기용 무선전력전달 장치 구현)

  • Lim, H.G.;Lee, J.W.;Kim, D.W.;Lee, J.H.;Seong, K.W.;Kim, M.N.;Cho, J.H.
    • Journal of Biomedical Engineering Research
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    • v.31 no.5
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    • pp.401-406
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    • 2010
  • Recently, many implantable medical devices have been developed and manufactured in many countries. In these devices, generally, energy is supplied by a transcutaneous method to avoid the skin penetration due to the power wires. As the most transcutaneous power transmission methods, the electromagnetic coupling between two coils and resonance at a specific frequency has been used widely. However, in case of a transcutaneous power transmitter with a fixed switching frequency to drive an electromagnetic coil, inefficient power transmission and thermal damage by the undesirable current variation may occur, because the electromagnetic coupling state between a primary coil and a secondary coil is very sensitive to skin thickness of each applied position and by person. In order to overcome these defects, a transcutaneous power transmitter of which operating frequency can be automatically tracked into the resonance frequency at each environment has been designed and implemented. Through the results of experiments for different coil surroundings, we have been demonstrated that the implemented transcutaneous power transmitter can track automatically into a varied resonance frequency according to arbitrary skin thickness change.

Measurement and Control of the Resonance Frequency for the Transcutaneous Energy Transmission System (TET) Using the Phase Locked Loop Circuit (PLL) (PLL을 이용한 무선 전력전송 장치의 공진 주파수의 계측 및 주파수 제어)

  • Choi, S.W.;Shim, E.B.
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.1613-1616
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    • 2008
  • A Transcutaneous Energy Transmission System (TET) has been developed for the wireless energy transmission with two magnetically coupled coils. A resonance circuit is used to raise the induced voltage and current of the secondary coil. Its resonance frequency depends on the internal resistance of circuit and the transferred energy. Because the transferred energy usually changes in wide range, the output voltage is unstable and the energy transferring efficiency decrease. A push-pull class E amplifier is usedto generate high frequency AC voltage. To maintain proper resonance frequency, the voltage output of the amplifier was continuously monitored and adjusted to the optimized resonance frequency. Because of its high frequency (370 kHz), a phase lockedloop circuit and a comparator are used to monitor the output waveform. The results of experimentaldata show that the PLL circuit can increase the transmission efficiency and stabilize the output voltage of TET.

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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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Feedback Analysis of Transcutaneous Energy Transmission with a Variable Load Parameter

  • Yang, Tianliang;Zhao, Chunyu;Chen, Dayue
    • ETRI Journal
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    • v.32 no.4
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    • pp.548-554
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    • 2010
  • The transcutaneous energy transmission system (TETS) composed of a Class-E amplifier may operate at a state away from the optimum power transmission due to the load variation. By introducing the feedback-loop technique, the TETS can keep the optimum state with constant output voltage by adjusting the important design parameters, that is, the duty ratio and frequency of the driving signal and the supply voltage. The relations between these adjusted parameters and the load are investigated. The effectiveness of the feedback technique is validated through a design example with a variable load parameter. The experimental results show that the Class-E amplifier in the feedback loop can keep operating at the optimum state under the condition of up to 50 percent variation of the load value.

A Basic Study on increase of efficiency for a Transcutaneous Energy Transmission System (경피적 에너지전송 시스템의 효율성 향상에 관한 기초적 연구)

  • 정지훈;김동욱
    • Proceedings of the KAIS Fall Conference
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    • 2003.06a
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    • pp.267-270
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    • 2003
  • All artificial infernal organs which are using electric energy supply energy with inductive couple. Transcutaneous energy transmission system enhance survival chance of the patients and quality of life by reducing volume and mass. In this research, we used both tune in transmission system in state of fixing cycle in order to increase the voltage gain and the current gain and to reduce effect of leakage inductance. Also to maximize the effect of resonance, a constant frequency duty cycle control method is used. Test is progressed with litz wire which is set up with various sizes of core to minimize size of converter. This research aimed in analysis of transcutaneous energy transmission system and in measuring of stability and efficiency of Lithium-ion battery charge which are using transmitted energy.

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Coil-Capacitor Circuit Design of a Transcutaneous Energy Transmission System to Deliver Stable Electric Power

  • Choi, Seong-Wook;Lee, Min-Hyong
    • ETRI Journal
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    • v.30 no.6
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    • pp.844-849
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    • 2008
  • A new transcutaneous energy transmission (TET) system was developed for transmitting electrical power to an implanted device, such as an artificial heart in a patient's body. This new design can maintain a stable output voltage independent of the load resistance. The system includes a compensation capacitor to reduce energy loss and increase power transfer efficiency. Experimental results show that the output voltage of the receiving coil changes very little as the load resistance varies from 14.8 ${\Omega}$ to 15 $k{\Omega}$, which corresponds to a change in output power from 0.1 to 97 W.

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Development of Transcutaneous Energy Transmission System for Implantable Devices (생체 이식형 무선에너지 전송 시스템 개발)

  • Yoo Dong-Soo;Lee Joon-Ha;Seo Hee-Don;Lee Sang-Hag
    • Progress in Medical Physics
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    • v.16 no.3
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    • pp.155-159
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    • 2005
  • As a part of implantable device in body, a transcutaneous energy transmission system has been developed. It would be desirable to tansfer electrical energy to implantable devices transcutaneously. The distance between transcutaneous transformer windings are approximately equal to the thickness of the human's skin, nominally between 10$\~$20 mm. Class-E resonant amplifier is used to drive a primary coil for high efficiency. Maximum current is above 50 mA at any frequency. The developed system shows that the circuit operates correctly at each frequency; 500 kHz, 1 MHz and 4 MHz.

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The basic research of transcutaneous energy transmission system for totally implantable artificial heart (체내 이식형 인공심장의 무선에너지 전송 시스템에 관한 기초적 연구)

  • Kim, J.H.;Kim, Dong-Wook
    • Proceedings of the KIEE Conference
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    • 2002.11c
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    • pp.407-410
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    • 2002
  • As a part of electro-mechanical totally implantable artificial heart, a transcutaneous energy transmission system has been developed. By mutual magnetic induction between the first coil on the skin and the subcutaneously implanted second coil, the system transfers electrical power through the skin. This research aimed a minimizing the size of the implanted part as well as maximizing the transfer efficiency. When an air gap is 1$\sim$2cm, voltage gain and current gain low and it is hard to transfer energy due to large leakage flux. That is, the required input voltage and input current must be large compared with the output voltage and output current, respectively, This paper research the inverter topology and the control method in order to increase the voltage gain and the current gain. For this purpose, this inverter employs double tune to compensate the large leakage inductance of primary and secondary of the transcutaneous transformer. And the output energy of transcutaneous energy transmission system supply for Lithium-ion battery charger.

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Development of Transcutaneous Energy Transmission System for Medical Instrument (의료용 무선 에너지 전달 장치의 개발)

  • 안재목;이동준
    • Journal of Biomedical Engineering Research
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    • v.16 no.4
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    • pp.447-456
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    • 1995
  • As a part of electro-mechanical totally implantable artificial heart (TIAH) program, a transcut- aneous energy transmission system has been developed. By mutual magnetic induction between the first coil on the skin and the subcutaneously implanted second coil, the system transfers elctrical power through the skin. This research aimed at minimizing the size of the implanted part as well as maximizing the transfer efficiency. Using class I amplifier, we achieved above 75% power transfer efficiency at average 40W power transfer level which is required for normal TIAH operation. In vivo performance of the developed system and bio-compatibility of the material used in Implanted parts were evaluated through animal experiments.

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