Design and analysis of a microelectromagnetic vibration transducer used as an implantable middle ear hearing aid

Park, Sekwang; Lee, Ki‐Chan

doi:10.1088/0960-1317/12/5/301

Cited by 13 publications

(5 citation statements)

References 8 publications

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“…High sound intensity will pain the patients [33], thus stapes displacement driven by the acoustic excitation of 100 dB SPL is often used as the MEI's hearing compensation standard [12,33]. This value was also taken as the design standard in this paper, and the maximum driving voltage of the piezoelectric actuator was set to 10.5 [34].…”

Section: The Determination Of the Piezoelectric Stack's Layer Numbermentioning

confidence: 99%

Design and analysis of a flextensional piezoelectric actuator for incus-body driving type middle ear implant

Liu¹,

Huang²,

Yang³

et al. 2017

J. vibroeng.

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In order to decrease the power consumption of current piezoelectric stack actuator for incus-body driving type middle ear implant (MEI), a new MEI's piezoelectric actuator with a flextensional amplifier was proposed. To aid the design process of this actuator, a human middleear mechanical model, which incorporated the viscoelastic properties of middle ear soft tissues, was established using finite element method. And the validation of this model was confirmed by comparing the model-predicted results with temporal bone experimental data. Then, based on this model, a coupling mechanical model of the flextensional piezoelectric actuator and the human ear was constructed and used to study the equivalent sound pressure level and power consumption of the actuator. The results show that the hearing compensation performance of the piezoelectric actuator was improved by introducing the flextensional amplifier, and the power consumption of the actuator was reduced significantly.

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Section: The Determination Of the Piezoelectric Stack's Layer Numbermentioning

confidence: 99%

Design and analysis of a flextensional piezoelectric actuator for incus-body driving type middle ear implant

Liu¹,

Huang²,

Yang³

et al. 2017

J. vibroeng.

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show abstract

“…In the design of the actuator, lots of studies take 100 dB SPL as the incentive sound pressure reference 35,36 and the excessive sound pressure will result in neuropathic pain of patients. 36 However, there is still little detailed report about the required excitation force of the actuator of ES MEI.…”

Section: The Required Excitation Force Of the Actuatormentioning

confidence: 99%

The effect of actuator and its coupling conditions on eardrum-stimulated middle ear implants: A numerical analysis

Liu

Zhou

et al. 2016

Proc Inst Mech Eng H

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Consisting of the actuator and coupling layer, a finite element model of the human middle ear was used to analyze the effect of the actuator and its coupling conditions on the performance of the eardrum-stimulated middle ear implants. This model which was based on the right ear of a healthy adult was built via microcomputed tomography imaging and the technique of reverse engineering. Based on this finite element model, the linear viscoelasticity of the human middle ear soft tissues and three-layer structure of the eardrum pars tensa which was orthotropic were considered. The validity of the model was verified by comparing the model calculated results with experimental data. After that, the influence of the three main design parameters of the actuator and two aspects of the coupling layer were investigated by the finite element model. The results show that (1) the manubrium tip is the optimal position for the actuator to stimulate; (2) the increased cross-section of the actuator would worsen its hearing compensation performance, especially in the low frequencies; (3) both the patients' residual hearing and the actuator's hearing compensation performance at high frequencies will be deteriorated with the increase in the actuator's mass; and (4) a coupling layer with a small Young's modulus and an area approximating 80% of the eardrum would reduce the stress of the eardrum effectively.

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“…Many MEI developers used 100 dB SPL as their transducer maximum amplified sound pressure level, since excessive amount of sound pressure would cause sensory nerve pain [30]. In current simulation, we also selected 100 dB SPL stimuli at the eardrum as a reference for the comparison study.…”

Section: Effects Of the Transducer Type On The Mei Performancementioning

confidence: 99%

Transducer Type and Design Influence on the Hearing Loss Compensation Behaviour of the Electromagnetic Middle Ear Implant in a Finite Element Analysis

Liu

Yang

et al. 2014

Advances in Mechanical Engineering

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Several types of electromagnetic transducer for the middle ear implants (MEIs) have been developed as an alternative to conventional hearing aids for the rehabilitation of sensorineural hearing loss. Electromagnetic transducer type and design are thought to have a significant influence on their hearing compensation performance. To investigate these effects, a middle ear computational model was constructed based on a complete set of microcomputerized tomography section images of a human ear. Its validity was confirmed by comparing the model predicted motions with published experimental measurements. The result shows that the eardrum driving transducer (EDT) is superior to the floating mass transducer (FMT) in hearing compensation when the transducer mass is small but inferior to the FMT when the mass gets bigger. The incus body driving transducer (IBDT) is the most ineffective type of transducer for hearing compensation. Moreover, the masses of the EDT and the FMT decrease the transducer performance mainly at higher frequencies: the greater the transducer mass, the lower the displacement of the stapes excited by these transducers. On the other hand, the IBDT driving rod stiffness decreases transducer's performance severely at low frequencies and its adverse effect on transducer performance increases with the decrease of the stiffness of the IBDT driving rod.

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Design and analysis of a microelectromagnetic vibration transducer used as an implantable middle ear hearing aid

Cited by 13 publications

References 8 publications

Design and analysis of a flextensional piezoelectric actuator for incus-body driving type middle ear implant

Design and analysis of a flextensional piezoelectric actuator for incus-body driving type middle ear implant

The effect of actuator and its coupling conditions on eardrum-stimulated middle ear implants: A numerical analysis

Transducer Type and Design Influence on the Hearing Loss Compensation Behaviour of the Electromagnetic Middle Ear Implant in a Finite Element Analysis

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