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

Shin, Dong-Hwa; Seong, Ki Woong; Jung, Eui Sung; Cho, Jin‐Ho; Lee, Kyu-Yup

doi:10.3233/thc-199039

Cited by 3 publications

(4 citation statements)

References 19 publications

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“…In this paper, to increase the efficiency of the bone conduction transducer proposed by Shin et al [23], the magnetic yoke using stainless steel 304 (SUS304) is replaced with a high permeability metal, such as Mu-metal. Subsequently, the magnitude of the Lorentz force calculated by electromagnetic analysis was compared with that of the conventional bone conduction transducer.…”

Section: B Electromagnetic Analysismentioning

confidence: 99%

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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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Section: B Electromagnetic Analysismentioning

confidence: 99%

“…Shin et al [23] proposed and developed a prototype of a dual-coil transducer for bone conduction hearing aids. The transducer is 18 mm in diameter and 11 mm in height, with a mechanical resonance frequency of 1.2 kHz.…”

Section: Introductionmentioning

confidence: 99%

Optimization and Performance Evaluation of a Transducer for Bone Conduction Implants

et al. 2020

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“…To improve vibrational displacement, Shin et al developed an electromagnetic BCI transducer using a permanent magnet, magnetic yoke, and two coils (top and bottom) wound in opposite directions [36]. Lee et al miniaturized and optimized the frequency characteristics of the transducer [37].…”

Section: Introductionmentioning

confidence: 99%

Effect of Driver Mass Loading on Bone Conduction Transfer in an Implantable Bone Conduction Transducer

2023

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This paper focuses on transducers, which are the most important components of bone conduction implants. To improve vibration magnitude, we develop a coil vibration transducer in which the driver mass loading is reduced by about 3.25-fold compared to magnet vibration transducers. We use finite element analysis to derive and implement the maximum Lorentz force and frequency characteristics. We compare the effect of driver mass loading on the vibration magnitude to that of an older transducer. The new transducer vibrates about 4.4-fold more strongly. To compare force magnitude between the two transducers, output force is measured using an artificial mastoid. The force imparted by the new transducer is higher than that of the older transducer only below 1.4 kHz, and tends to be lower at high frequencies. Nevertheless, the improved force in the low-frequency region will improve conductive hearing loss.INDEX TERMS Artificial mastoid, bone conduction implants, finite element analysis, output force level, transducer.

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“…To increase the output of the bone conduction transducer, Shin et al [30] proposed a prototype electromagnetic transducer with a dual coil structure. The mechanical resonance frequency of the transducer was adjusted using a vibrational membrane with a multiple-cantilever structure.…”

Section: Introductionmentioning

confidence: 99%

An Assembly Quality Inspection System for Bone Conduction Implant Transducers

Shin

Cho

2021

IEEE Access

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We designed and implemented a two-axis measurement system to inspect the assembly quality condition of a bone conduction implant (BCI) transducer. The system consists of a laser Doppler vibrometer (LDV), XY manual stage, and two digital scale calipers capable of displaying a position coordinate system. To measure the vibration of the cantilever constituting the transducer vibrational membrane, an XY coordinate system was obtained using FEA software. Based on the derived XY coordinate system, the cantilever vibration displacement of the vibrational membrane was measured for each coordinate using the LDV at 0.5, 0.9, and 2 kHz. To visualize the measured area, we developed a Matlab-based application and then visualized the motion of the cantilever. The alignment and misalignment models of the vibrational membrane and permanent magnet were designed using finite element analysis (FEA) software, and the measured cantilever motions of the vibrational membrane were then compared. Finally, to numerically compare the vibration magnitude of the cantilever, the standard deviation was calculated based on the displacement of each edge of the cantilever. The fabricated BCI transducer had a higher standard deviation (3.5 times at 0.5 kHz, 2.3 times at 0.9 kHz) than the ideally aligned FEA model, but the standard deviation was about eight times lower (at 0.5 and 0.9 kHz) than that of the misaligned case. The results of the numerical comparison indicated that the manufactured BCI transducer was very well assembled.

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

Cited by 3 publications

References 19 publications

Optimization and Performance Evaluation of a Transducer for Bone Conduction Implants

Optimization and Performance Evaluation of a Transducer for Bone Conduction Implants

Effect of Driver Mass Loading on Bone Conduction Transfer in an Implantable Bone Conduction Transducer

An Assembly Quality Inspection System for Bone Conduction Implant Transducers

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