Contribution of the flexible incudo-malleal joint to middle-ear sound transmission under static pressure loads

Warnholtz, Birthe; Schär, M.; Sackmann, Benjamin; Lauxmann, Michael; Chatzimichalis, Michail; Prochazka, Lukas; Dobrev, Ivo; Huber, Alexander; Sim, Jae Hoon

doi:10.1016/j.heares.2021.108272

Cited by 8 publications

(3 citation statements)

References 22 publications

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“…Static pressures in the range of ±3 kPa were generated by a pressure regulator PQ1 (AirCom Pneumatic GmbH, Germany), and the static pressure in the AEC was monitored using an electronic pressure gauge HCLA0075B (First Sensor AG, Germany), and was controlled within ±50 Pa of the targeted static pressure. The methods to generate and control static pressures in the AEC were the same as the methods used for our previous study (Warnholtz et al 2021).…”

Section: Temporal Bone Preparation and Static Pressure Regulationmentioning

confidence: 99%

“…Later studies (e.g., Murakami et al 1997;Gan et al 2006;Homma et al 2010;Warnholtz et al 2021) showed from their measurements using laser Doppler vibrometry that such static pressure difference across the tympanic membrane attenuates middle-ear sound transmission through the human middle ear at low frequencies below the first resonance of the middle-ear ossicular chain. Warnholtz et al (2021) demonstrated from their experimental work that the flexibility of the incudo-malleal joint (IMJ) in the human middle ear reduced the attenuation of the middle-ear sound transmission, thereby performing a kind of adaptation function to sudden changes of ambient static pressure before opening of the Eustachian tube or under pressureequalization malfunctions.…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional quasi-static displacement of human middle-ear ossicles under static pressure loads: Measurement using a stereo camera system

et al. 2023

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Section: Temporal Bone Preparation and Static Pressure Regulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Three-dimensional quasi-static displacement of human middle-ear ossicles under static pressure loads: Measurement using a stereo camera system

et al. 2023

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“…The effectiveness of hearing reconstruction is typically assessed by measuring the vibration curve of the stapes footplate under specific sound pressure (ASTM, 2014). Although Laser Doppler Vibrometer (LDV) can be used to measure the vibration of the stapes footplate at present (Warnholtz et al, 2021), this method is invasive and usually only used to measure vibrations in human or animal cadaveric temporal bones (Ding et al, 2016). The finite element method is a tool for computing approximate solutions to complex mathematical problems.…”

Section: Introductionmentioning

confidence: 99%

Evaluation on the possibility of sound conduction independent of tympanic air cavity for severe tympanic adhesion patients by finite element analysis

Qin,

Yin,

Sun

et al. 2023

Front. Bioeng. Biotechnol.

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Background: For patients with severe tympanic adhesion, reconstructing the tympanic air cavity is often challenging, resulting in poor hearing reconstruction outcomes. Therefore, establishing a sound conduction pathway independent of the tympanic air cavity may be a viable method for reconstructing hearing in these patients.Purpose: The objective of this study was to evaluate the feasibility of sound conduction independent of the tympanic air cavity (i.e., replacing the original cavity with a tympanic vibrating material) using finite element analysis.Methods: We established a sound-structure coupling finite element model of the tympanum vibration conduction system, which included the tympanic membrane (TM), ossicular prosthesis, and tympanic vibrating material. This model was used to simulate middle ear vibrations under sound pressure, and we extracted the frequency response curve of the ossicular prosthesis’ vibration displacement amplitude to evaluate the sound conduction effect of the middle ear. Next, we adjusted the structural and mechanical parameters of the tympanic vibrating material to analyze its impact on the sound conduction effect of the middle ear. Finally, we compared the frequency response curve of the stapes footplate in normal subjects to evaluate the feasibility of sound conduction independent of the tympanic air cavity.Results: The Shell tympanic vibrating material had a better vibration conduction effect compared to solid or porous tympanic vibrating material. The vibration amplitude decreases with the increasing elastic modulus of the tympanic vibrating material. Implantation of 40 kPa-shell tympanic vibrating material had the lowest hearing loss less than 5 dB, and the hearing loss with 1 MPa-porous tympanic vibrating material was largest and less than 25 dB.Conclusion: Our study suggests that replacing the tympanic air cavity with a tympanic vibrating material is feasible. The establishment of a sound conduction pathway independent of the tympanic air cavity could potentially provide a method for hearing reconstruction in patients with severe tympanic adhesion.

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Vibration Measurements of the Gerbil Eardrum Under Quasi-static Pressure Sweeps

Kose

Funnell²,

Daniel³

2022

JARO

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Contribution of the flexible incudo-malleal joint to middle-ear sound transmission under static pressure loads

Cited by 8 publications

References 22 publications

Three-dimensional quasi-static displacement of human middle-ear ossicles under static pressure loads: Measurement using a stereo camera system

Three-dimensional quasi-static displacement of human middle-ear ossicles under static pressure loads: Measurement using a stereo camera system

Evaluation on the possibility of sound conduction independent of tympanic air cavity for severe tympanic adhesion patients by finite element analysis

Vibration Measurements of the Gerbil Eardrum Under Quasi-static Pressure Sweeps

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