Design and Development of a Tri-Coil Bellows Transducer for RW-Drive Implantable Middle-Ear Hearing Aid Using FEA

Shin, Dong-Hwa; Cho, Jin‐Ho

doi:10.1109/tmech.2018.2809007

Cited by 14 publications

(13 citation statements)

References 33 publications

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“…The RW-drive middle-ear hearing aid consists of a microphone, a signal-processing device, and an RW actuator; a conceptual illustration is shown in Figure 1 [ 18 ]. The principle of the RW-drive middle-ear hearing aid consists of several steps.…”

Section: Methodsmentioning

confidence: 99%

“…As a result, the displacement generated in the piezoelectric element is reduced. To solve this problem, a bellows with very low stiffness was used [ 18 , 21 ]. Since the stiffness of the bellows was slight when compared with that of the internal cantilever membrane, the frequency characteristics of the actuator were not affected.…”

Section: Methodsmentioning

confidence: 99%

“…The formulas for calculating stiffness of the bellows and the cantilever membrane are shown in Equations (1) and (2), respectively [ 18 , 22 ].

where k b is the stiffness of the bellows, D b is the outer diameter of the bellows, E b is the Young’s modulus describing the elasticity of the material used for the bellows, t b is the thickness of one ply of the material used for the bellows, w b is the depth of each corrugation, C b is a correction factor for the bellows’ stiffness, n is the number of layers of the material used for the bellows, and N is the number of corrugations in the bellows.…”

Section: Methodsmentioning

confidence: 99%

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Piezoelectric Actuator with Frequency Characteristics for a Middle-Ear Implant

Shin

Cho

2018

Sensors

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The design and implementation of a novel piezoelectric-based actuator for an implantable middle-ear hearing aid is described in this paper. The proposed actuator has excellent low-frequency output characteristics, and can generate high output in a specific frequency band by adjusting the mechanical resonance. The actuator consists of a piezoelectric element, a miniature bellows, a cantilever membrane, a metal ring support, a ceramic tip, and titanium housing. The optimal structure of the cantilever-membrane design, which determines the frequency characteristics of the piezoelectric actuator, was derived through finite element analysis. Based on the results, the piezoelectric actuator was implemented, and its performance was verified through a cadaveric experiment. It was confirmed that the proposed actuator provides better performance than currently used actuators, in terms of frequency characteristics.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The formulas for calculating stiffness of the bellows and the cantilever membrane are shown in Equations (1) and (2), respectively [ 18 , 22 ].

Section: Methodsmentioning

confidence: 99%

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Piezoelectric Actuator with Frequency Characteristics for a Middle-Ear Implant

Shin

Cho

2018

Sensors

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“…In the case of middle-ear implant actuators, the limited space in the middle-ear cavity limits the size of actuator that can be implanted. On the other hand, since the implantable bone conduction actuator is implanted in the mastoid, a larger size actuator can be used, as compared to the middle-ear implant actuators [16][17][18]. Based on the computed tomography image of the cranium [16], the dimension of the actuator was set at 18 mm in dia.…”

Section: Design Of the Dual-coil Electromagnetic Actuatormentioning

confidence: 99%

Design of a dual-coil type electromagnetic actuator for implantable bone conduction hearing devices

Shin

Seong

Jung

et al. 2019

THC

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BACKGROUND: This paper describes the design and implementation of a dual-coil type electromagnetic actuator for implantable bone conduction hearing devices. OBJECTIVE: The structure of the proposed actuator was designed to generate maximum Lorentz force via the dual-coil method with a closed magnetic circuit. To satisfy the indications required by implantable bone conduction hearing devices, high output was generated within a specific frequency range using a vibrational membrane with a cantilever. METHODS: The structure of the membrane consists of a fixed ring, a circular plate, and two cantilevers connected symmetrically. Variable elements of the vibrational membrane affecting the actuator frequency characteristics were analyzed through mathematical modeling and finite element analysis, based on the analysis used to derive the optimum structure of the vibrational membrane. The components of the actuator were fabricated through chemical etching and computer numerical control process, and the bone conduction actuator was fabricated through the precision assembly process. RESULTS: The output characteristics of the implemented actuator were measured using a laser Doppler vibrometer. As a result of measurement, the proposed actuator generated mechanical resonance at 1.2 kHz. CONCLUSIONS: By comparing the measured results with the finite element analysis results, we confirmed the validity of the proposed actuator design.

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“…Because middle-ear implants require complicated surgery, they are not a popular choice for many patients with hearing loss. In addition, they are difficult to apply if the ossicular chain is lost due to disease or is anomalous [10]- [14]. Cochlear implantation is the only method to restore hearing to patients with severe-to-profound sensorineural hearing loss; indications for cochlear implantation differ greatly from the indications for hearing rehabilitation systems listed above.…”

Section: Introductionmentioning

confidence: 99%

Optimization and Performance Evaluation of a Transducer for Bone Conduction Implants

et al. 2020

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We designed and implemented an electromagnetic transducer for implantable bone conduction hearing aids. The proposed transducer is smaller than previous bone conduction transducers for easy implantation and was designed using high permeability metals to produce large electromagnetic forces. In addition, the number of cantilever beams was changed from two to three to minimize distortion of the transducer, potentially due to twisting of the cantilever beam. The proposed transducer consists of a titanium cover with three screw holes, a metal ring, a circular plate, a vibrational membrane with a three-cantilever structure, a metal plate and cylinder, a permanent magnet, top and bottom coils, and a cylindrical titanium case. The transducer was optimally designed based on analysis of electromagnetic and mechanical vibrations, and the target resonance frequency was derived by controlling the variable elements of the vibrational membrane. The transducer was manufactured based on the results of finite element analysis, and the validity of the design was verified by comparing the results of vibration measurement experiments and a simulation. Finally, to evaluate the performance of the proposed transducer, the transducer was attached to the mastoid of participants and functional near-infrared spectroscopy was used to measure brain activation changes of the auditory cortex due to vibration stimulation. INDEX TERMS Implantable bone conduction hearing aid, electromagnetic transducer, finite element analysis, functional near-infrared spectroscopy.

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Design and Development of a Tri-Coil Bellows Transducer for RW-Drive Implantable Middle-Ear Hearing Aid Using FEA

Cited by 14 publications

References 33 publications

Piezoelectric Actuator with Frequency Characteristics for a Middle-Ear Implant

Piezoelectric Actuator with Frequency Characteristics for a Middle-Ear Implant

Design of a dual-coil type electromagnetic actuator for implantable bone conduction hearing devices

Optimization and Performance Evaluation of a Transducer for Bone Conduction Implants

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