고효율 전자기형 정원창 구동 트랜스듀서의 설계
Design of electromagnetic type transducer to drive round windowwith high efficiency
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Implantable middle ear hearing devices(IMEHDs) have being actively studied to overcome the problems of conventional hearing aids. Vibration transducer, an output devices of IMEHDs, is attached on the ossicular chain and transmits mechanical vibration to cochlea. This approach allows us to hear more clear sound because mechanical vibration is effective to transfer high frequency acoustics, but occurs some problems such as fatigue accumulation to ossicular chian and reduction of vibration displacement caused by mass loading effect. Recently, many studies for the round window stimulation are announced, because it does not cause such problems. It have been studied by older transducers designed for attaching on ossicular chain. In this paper, we proposed a new electromagnetic transducer which consists of two magnets, three coils and a vibration membrane. The magnet assembly, magnet coupled in opposite direction, were placed in the center of three coils, and the optimum length of each coil generating maximum vibrational force was calculated by finite element analysis(FEA). The transducer was implemented as the calculated length of each coil, and measured vibration displacement. From the results, it is verified the vibration displacement can be improved by optimizing the length of coils.
Abstract
Implantable middle ear hearing devices(IMEHDs) have being actively studied to overcome the problems of conventional hearing aids. Vibration transducer, an output devices of IMEHDs, is attached on the ossicular chain and transmits mechanical vibration to cochlea. This approach allows us to hear more clear sound because mechanical vibration is effective to transfer high frequency acoustics, but occurs some problems such as fatigue accumulation to ossicular chian and reduction of vibration displacement caused by mass loading effect. Recently, many studies for the round window stimulation are announced, because it does not cause such problems. It have been studied by older transducers designed for attaching on ossicular chain. In this paper, we proposed a new electromagnetic transducer which consists of two magnets, three coils and a vibration membrane. The magnet assembly, magnet coupled in opposite direction, were placed in the center of three coils, and the optimum length of each coil generating maximum vibrational force was calculated by finite element analysis(FEA). The transducer was implemented as the calculated length of each coil, and measured vibration displacement. From the results, it is verified the vibration displacement can be improved by optimizing the length of coils.
참고문헌 (12)
- J. Suzuki, "Early studies and the history of development of the middle ear implant in Japan", Advances in Audiology, 4, pp.1~14 (1988)
- R. Goode, "The history and development of the implantable hearing aid", The Otolaryngologic Clinics of North America, 28(1), pp.1~16 (1995)
- R.Goode, "Current status and future of implantable electromagnetic hearing aids", The Otolaryngologic Clinics of North America, 28(1), pp.141~145 (1995)
- R, Häusler, "A novel implantable hearing system with direct acoustic cochlear stimulation", Audiology & Neurotology, 13(4), pp.247~256 (2008)
- E. P. Hing, "Evaluation of an implantable piezoelectric floating mass transducer for sensorineural hearing loss", J. Mechatronics, 19(6), pp.965~971 (2009)
- A. J. Needham, "The effects of mass loading the ossicles with a floating mass transducer on middle ear transfer function", Otology & Neurotology, 26(2), pp.218~224 (2005)
- 송병섭, "이식형 인공중이 시스템을 위한 고효율 차동 전자 트랜스듀서의 설계", 센서학회지, 11(3), pp.7~ (2002), 한국센서학회
- K. W. Seong, "Design of new vibration transducer for implantable middle ear hearing device", IEEJ Transactions on Electrical and Electronic Engineering, 5, pp.608~610 (2010)
- 성기웅, "PZT 적측 압전체를 이용한 Guinea pig 정원창 자극 및 이에 따른 청성뇌간유발반응의 측정", 한국센서학회 종합학술대회, pp.340~343 (2007)
- J. Kiefer, "Round window stimulation with an implantable hearing aid(soundbridge)combined with autogenous reconstruction of the auricle-a new approach", Otolaryngology-Head and Neck Surgery, 68(6), pp.378~385 (2006)
- H. Nakajima, "Evaluation of round window stimulation using the floating mass transducer by intracochlear sound pressure measurements in human temporal bones cavity", Otology & Neurotology, 31(3), pp.506~511 (2009)
- W. Pilkey, "Formulas for stress, strain, and structural matrices", pp.955~1096 (1994), John Wiley & Sons