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

Xu, Dan; Liu, Houguang; Zhou, Lei; Yang, Jianhua; Huang, Xinsheng; Liu, Xiaole

doi:10.1177/0954411916675381

Cited by 8 publications

(3 citation statements)

References 36 publications

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“…Therefore, a human middle-ear biomechanics model must be established to aid this study. Considering the finite element method (FEM) has the advantage of handling complex geometries [15,16], a finite element human middle ear was established firstly. Then, the layer number of the piezoelectric stack was ascertained based on this model.…”

Section: The Piezoelectric Stack' Layer Number Of the Actuatormentioning

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 Piezoelectric Stack' Layer Number Of the Actuatormentioning

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.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Therefore, investigating the effect of inefficient coupling of the actuator and the RWM is important during reverse stimulation. Furthermore, compared with the human ear finite-element model, 25–27 the superiorities of the circuit model are that the impedance of the various components of the human ear can be specified quantitatively by experimental measurements. 28–30 Moreover, the circuit element helps to simulate the piezoelectric actuator and the inefficient coupling of the actuator to the RWM.…”

Section: Introductionmentioning

confidence: 99%

Research on coupling effects of actuator and round window membrane on reverse stimulation of human cochlea

Xue

Liu

Yang

et al. 2021

Proc Inst Mech Eng H

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An active actuator of a middle-ear implant coupled to the round window membrane (RWM), which transmits vibration to the cochlea, has been used to compensate for hearing loss in patients. However, various factors affect the coupling condition between the actuator and the RWM, resulting in coupling leakage. In this study, a coupling impedance model of the human ear and the actuator was used to investigate the effect of inefficient coupling during reverse stimulation. First, the three-port circuit network model of the actuator was coupled with the acoustic impedance model of human ear reverse sound transmission. Meanwhile, the inefficient coupling impedance was estimated. Then, the effect of the actuator’s coupling on reverse stimulation was studied by comparing the reverse pressure transfer function. Furthermore, the inefficient coupling’s influence in the ear with middle-ear disorder was also investigated by simulating two typical forms of middle-ear disorder: otosclerosis and ossicular chain disarticulation. The results show that the change of the inefficient coupling impedance plays a significant role during reverse stimulation. Inefficient coupling of the actuator and the RWM deteriorates the cochlear response of reverse stimulation over the entire frequency range. Additionally, the coupling effect of the actuator does not change the influence tendency of middle-ear disorder on reverse stimulation’s performance, but changes the response amplitude of the reverse stimulation.

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“…Accordingly, in this article, the influence of ossicular chain malformations on the RW stimulation was studied. Considering the fact that FE method has advantages in simulating the biological system with complex structure, 22–24 we constructed a human ear FE model composed of three portions: the ear canal, middle ear, and cochlea. By comparing the cochlear basilar membrane (BM)’s displacement under RW stimulation and normal sound excitation, the influence of ossicular chain malformations on RW stimulation was investigated.…”

Section: Introductionmentioning

confidence: 99%

Influence of ossicular chain malformation on the performance of round-window stimulation: A finite element approach

Liu

Zhang

Yang

et al. 2019

Proc Inst Mech Eng H

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As a novel application of implantable middle ear hearing device, round-window stimulation is widely used to treat hearing loss with middle ear disease, such as ossicular chain malformation. To evaluate the influence of ossicular chain malformations on the efficiency of the round-window stimulation, a human ear finite element model, which incorporates cochlear asymmetric structure, was constructed. Five groups of comparison with experimental data confirmed the model’s validity. Based on this model, we investigated the influence of three categories of ossicular chain malformations, that is, incudostapedial disconnection, incus and malleus fixation, and fixation of the stapes. These malformations’ effects were evaluated by comparing the equivalent sound pressures derived from the basilar membrane displacement. Results show that the studied ossicular chain malformations mainly affected the round-window simulation’s performance at low frequencies. In contrast to the fixation of the ossicles, which mainly deteriorates round-window simulation’s low-frequency performance, incudostapedial disconnection increases this performance, especially in the absence of incus process and stapes superstructure. Among the studied ossicular chain malformations, the stapes fixation has a much more severe impact on the round-window stimulation’s efficiency. Thus, the influence of the patients’ ossicular chain malformations should be considered in the design of the round-window stimulation’s actuator. The low-frequency output of the round-window simulation’s actuator should be enhanced, especially for treating the patients with stapes fixation.

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

Cited by 8 publications

References 36 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

Research on coupling effects of actuator and round window membrane on reverse stimulation of human cochlea

Influence of ossicular chain malformation on the performance of round-window stimulation: A finite element approach

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