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Analysis of the influence of the transducer and its coupling layer on round window stimulation

Liu H., Xu D., Yang J., Yang S., Cheng G., Huang X.

Acta of Bioengineering and Biomechanics

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2017

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Vol. 19, no. 2

103--111

EN

Purpose: In this work, a finite element study is proposed to evaluate the effects of the transducer and its coupling layer on the performance of round window (RW) stimulation. Methods: Based on a set of micro-computer tomography images of a healthy adult’s right ear and reverse engineering technique, a coupled finite-element model of the human ear and the transducer was constructed and verified. Then, the effect of the cross-section of the transducer, the elastic modulus of the coupling layer, the mass of the transducer, and the preload of the transducer were studied. Results: The increase of the transducer’s cross-section area deteriorates the RW stimulation, especially at the lower frequencies. This adverse effect of the cross-section area’s increase of the transducer can be reduced by adding a coupling layer between the transducer and the RW. However, the coupling layer’s improvement on the RW stimulation is reduced with the increase of its elastic modulus. Moreover, the mass loading of the transducer decreases the RW stimulation’s performance mainly at higher frequencies and applying a static preload on the transducer enhances its hearing compensating performance at higher frequencies. Conclusions: The influence of the transducer’s mass, the mass of the transducer, the applied static preload and the properties of the coupling layer must be taken into account in the design of the RW stimulation type implantable middle ear hearing device.

2

Model sterowania w przemysłowym systemie aktywnej redukcji hałasu

Pawełczyk M., Latos M., Bartoszek S.

Modelowanie Inżynierskie

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2012

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T. 13, nr 44

229-236

PL

Przedstawiono praktyczne sposoby ochrony narządu słuchu pracowników na stanowiskach pracy poprzez zastosowanie rozwiązań personalnych i globalnych. Prezentując rozwiązanie personalne, bazujące na zastosowaniu aktywnej wkładki dousznej, pokazano proces projektowania układu sterowania w strukturze kompensacji o stałych parametrach, jak również wyniki badań eksperymentalnych . Omówiono rozwój metod ochrony przed hałasem rozwijanych w ITG KOMAG poprzez propozycje rozwiązań globalnych na wybranych stanowiskach pracy.

EN

Technical approaches to hearing protection in the workplace using personal and global solutions have been discussed. In the personal solution, based on active earplugs, the process of designing a feedforward, fixed parameter control system, as well as real-world experimental results have been presented. Active noise reduction methods under development by ITG KOMAG have been considered as a part of proposing global solutions in the selected workplaces.

3

Aparaty słuchowe a implanty słuchu. Stan obecny i perspektywy rozwoju

Pietralik I., Łagan S.

Aktualne Problemy Biomechaniki

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2011

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z. 5

127--132

PL

Słuch jest zmysłem pozwalającym na odbieranie fal dźwiękowych. Narządem słuchowym są uszy. Coraz częściej człowiek spotyka się z ubytkiem słuchu. Historia zastosowania pierwszych urządzeń wspomagających słyszenie sięga aż starożytności. Zaczęto używać metalowe tuby. Wynalezienie mikrofonu, wzmacniaczy i tranzystorów spowodowało szybki postęp w rozwoju i miniaturyzacji aparatów słuchowych. Dzisiejsze aparaty słuchowe są dostosowywane do każdego pacjenta indywidualnie. Możemy wyróżnić aparaty słuchowe zauszne typu BTE i typu RITE, a także aparaty wewnątrzuszne ITE i wewnątrzkanałowe CIC.

EN

This paper presents a literature review based on the generation of hearing aids, with particular emphasis on the anatomical structures of the ear and hearing loss affecting the structure and type of prostheses. An important aspect is the analysis of future solutions, taking into account the advantages and disadvantages of current hearing aids and their uses.

4

Development of cartilage conduction hearing aid

Hosoi Y., Yanai S., Nishimura T., Sakaguchi T., Iwakura T., Yoshino K.

Archives of Materials Science and Engineering

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2010

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Vol. 42, nr 2

104-110

EN

Purpose: The potential demand for hearing aids is increasing in accordance with aging of populations in many developed countries. Because certain patients cannot use air conduction hearing aids, they usually use bone conduction hearing aids. However, bone does not transmit sound as efficiently as air, and bone conduction hearing aids require surgery (bone anchored hearing aid) or great pressure to the skull. The first purpose of this study is to examine the efficacy of a new sound conduction pathway via the cartilage. The second purpose is to develop a hearing aid with a cartilage conduction transducer for patients who cannot use regular air conduction hearing aids. Design/methodology/approach: We examined the hearing ability of a patient with atresia of both external auditory meatuses via three kinds of conduction pathways (air, bone, and cartilage). After the best position for the cartilage conduction transducer was found, audiometric evaluation was performed for his left ear with an insertion earphone (air conduction), a bone conduction transducer, and a cartilage conduction transducer. Then we made a new hearing aid using cartilage conduction and got subjective data from the patients. Findings: The tragal cartilage was the best position for the cartilage conduction transducer. The patient’s mean hearing levels were 58.3 dBHL, 6.7 dBHL, and 3.3 dBHL for air conduction, bone conduction, and cartilage conduction respectively. The hearing ability of the patients obtained from the cartilage conduction hearing aid was comparable to those from the bone conduction hearing aid. Practical implications: Hearing levels using cartilage conduction are very similar to those via bone conduction. Cartilage conduction hearing aids may overcome the practical disadvantages of bone conduction hearing aids such as pain and the need for surgery. Originality/value: We have clarified the efficacy of the cartilage conduction pathway and developed a prototype ‘cartilage conduction hearing aid’, which is the first hearing aid to use sound transmission via cartilage.