Design of a Differential Electromagnetic Transducer for Use in IME System

Byung-Seop SONG  Min-Kyu KIM  Young-Ho YOON  Sang-Heun LEE  Jin-Ho CHO  

IEICE TRANSACTIONS on Information and Systems   Vol.E87-D   No.5   pp.1231-1237
Publication Date: 2004/05/01
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Speech and Hearing
implantable middle ear,  hearing aid,  transducer,  sound vibration,  

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A differential electromagnetic transducer (DET) was implemented using micro electro mechanical system (MEMS) technology for use in an implantable middle ear (IME) system. The DET is designed to have good vibration efficiency and structure that can't be interfered by the external environmental magnetic field. In order to preserve the uniform vibration performance, the MEMS technology was introduced to manufacture the elastic membrane using polyimide that is softer than silicon. Using the finite element analysis (FEA), vibration characteristics are simulated and designed so that the resonance frequency of the membrane is closed to that of the middle ear. The results of the vibration experiments of the developed DET showed excellent results. We implemented the IME system using a DET and implanted it into a dog. This showed the IME system performed well in a living body.