Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Design of High Efficiency Differential Electromagnetic Type Transducer for Implantable Middle Ear System

이식형 인공중이 시스템을 위한 고효율 차동 전자 트랜스듀서의 설계

  • Song, Byung-Seop (Sensor Technology Research Center, Kyungpook National University) ;
  • Ro, Chul-Kyun (Department of Control & Instrumentation Eng., Kyungil University) ;
  • Kim, Myoung-Nam (Department of Biomedical Engineering, School of Medicine, Kyungpook National University) ;
  • Cho, Jin-Ho (Department of Biomedical Engineering, School of Medicine, Kyungpook National University)
  • 송병섭 (경북대학교 센서기술 연구소) ;
  • 노철균 (경일대학교 제어계측공학과) ;
  • 김명남 (경북대학교 의과대학 의공학교실) ;
  • 조진호 (경북대학교 의과대학 의공학교실)
  • Published : 2002.05.31
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Abstract

The differential electromagnetic transducer for IME(implantable middle ear) system, which have two small permanent magnets glued with the same pole facing each other in the coil, has high vibration efficiency and does not influenced by external magnetic field. In this paper, using finite element method, highly efficient structure of the transducer was proposed and vibration force of the transducer was calculated by electromagnetic theory. And the necessary vibration force of transducer to transmit the sound signal to inner ear when the transducer is attached at stapes was calculated and the design parameters of the transducer were investigated. Using the parameters, the differential electromagnetic transducer was manufactured in small size to implant in confined human middle ear. And it was examined by unloaded and loaded vibration experiment using temporal bone sampled from cadaver.

이식형 인공중이에 사용되는 일반적인 전자기 방식의 진동 트랜스듀서에 비하여 두 개의 소형 영구자석을 같은 극끼리 접착한 후 코일내부에 위치시킨 차동 전자 트랜스듀서는 효율이 높고 코일-영구자석간의 공극조정이 필요 없으며 외부의 자기장에 대하여 영향을 받지 않는 특성을 가진다. 본 논문에서는 이러한 차동 전자 트랜스듀서를 이식형 인공중이 시스템에 사용하기 위하여 입력전류에 대하여 진동력의 크기를 최대화시킬 수 있는 효율적인 구조를 제안, 해석하였다. 유한요소 해석을 통하여 가장 효율적인 코일과 자석의 길이 비를 도출하였고 소리신호 전달을 위한 트랜스듀서의 필요 진동력을 산출한 후 트랜스듀서 발생 진동력을 해석하였다. 그리고 실제 이소골에 이식할 수 있는 크기의 트랜스듀서를 제작하기 위한 설계상수를 추출하였다. 계산된 설계상수를 이용하여 이식 가능한 크기로 트랜스듀서를 구현한 후 무부하 실험과 사체 부하 실험을 실시하여 제작된 트랜스듀서가 실제 중등이상 고도난청자를 위한 이식형 인공중이 시스템에 사용될 수 있음을 증명하였다.

Keywords

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