An Axisymmetric Finite Element Model to Study the Earplug Contribution to the Bone Conduction Occlusion Effect

2015 ◽  
Vol 101 (4) ◽  
pp. 775-788 ◽  
Author(s):  
Martin K. Brummund ◽  
Franck Sgard ◽  
Yvan Petit ◽  
Frédéric Laville ◽  
Hugues Nélisse
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Bone Conduction ◽  
Element Model ◽  
Occlusion Effect

The Vibration Analysis of Bone Conduction for Bone-Anchored Hearing Aids: In Vivo Human Temporal Bone

2011 ◽  
Vol 145 ◽  
pp. 93-98
Author(s):  
Jen Fang Yu ◽  
Zi Xiang Wei ◽  
Chin Kuo Chen ◽  
Ching I Chen
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Temporal Bone ◽  
Hearing Aids ◽  
Bone Conduction ◽  
Element Model ◽  
Second Phase ◽  
Center Line ◽  
The Finite Element Model

This study constructed a 3D finite element model of temporal bone non-invasively, based on the computed tomography scan image of anin vivotemporal bone. To observe the geometry and measurements of the temporal bone, the finite element model was built using ANSYS®. The finite element model involved two phases. The first phase entailed discussing the natural vibration frequencies and vibration mode of the temporal bone. The second phase involved investigating the harmonic response. The base center and center line were established in the external auditory meatus and the 0 degree direction, respectively. The amplitude force was applied along the center line and at 15 degrees from center line and at distances of 30 mm, 35 mm, and 40 mm from the center point of ear canal. The amplitude of the bone-anchored hearing aids was approximately 550 g when stimulated by the vibrator. This paper discusses the frequency responses and characteristics of the BAHA vibrator on the mastoid of the temporal bone at the frequencies of 125 Hz, 250 Hz, 500 Hz, 750 Hz, 1 kHz, 2 kHz, 3 kHz, 4 kHz, 5 kHz, 6 kHz, 7 kHz, 8 kHz. Based on the results of conducting modal analysis of the temporal bone, 11 natural frequencies, 125 Hz, 250 Hz, 500 Hz, 750 Hz, 1 k Hz, 2 kHz, 3 kHz, 4 kHz, 5 kHz, 6 kHz, and 7 kHz, included the stimuli frequencies of pure tone audiometry. Based on the results obtained by conducting harmonic analysis of the temporal bone, the performance of bone conduction at 35 mm and at 15 degrees was higher than those at 0 and -15 degrees.

A Finite Element Model of the Human Head for Auditory Bone Conduction Simulation

ORL ◽  
2006 ◽  
Vol 68 (6) ◽  
pp. 319-323 ◽  
Author(s):  
Henning Taschke ◽  
Herbert Hudde
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Bone Conduction ◽  
Human Head ◽  
Element Model

scholarly journals Characteristics of Bone-Conduction Devices Simulated in a Finite-Element Model of a Whole Human Head

2019 ◽  
Vol 23 ◽  
pp. 233121651983605 ◽  
Author(s):  
You Chang ◽  
Stefan Stenfelt
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Bone Conduction ◽  
Human Head ◽  
Element Model ◽  
Dynamic Force ◽  
Direct Drive ◽  
Electric Voltage ◽  
Low Frequencies ◽  
Vibration Responses

Nowadays, many different kinds of bone-conduction devices (BCDs) are available for hearing rehabilitation. Most studies of these devices fail to compare the different types of BCDs under the same conditions. Moreover, most results are between two BCDs in the same subject, or two BCDs in different subjects failing to provide an overview of the results between several of the BCDs. Another issue is that some BCDs require surgical procedures that prevent comparison of the BCDs in the same persons. In this study, four types of skin-drive BCDs, three direct-drive BCDs, and one oral device were evaluated in a finite-element model of the human head that was able to simulate all BCDs under the same conditions. The evaluation was conducted using both a dynamic force as input and an electric voltage to a model of a BCD vibrator unit. The results showed that the direct-drive BCDs and the oral device gave vibration responses within 10 dB at the cochlea. The skin-drive BCDs had similar or even better cochlear vibration responses than the direct-drive BCDs at low frequencies, but the direct-drive BCDs gave up to 30 dB higher cochlear vibration responses at high frequencies. The study also investigated the mechanical point impedance at the interface between the BCD and the head, providing information that explains some of the differences seen in the results. For example, when the skin-drive BCD attachment area becomes too small, the transducer cannot provide an output force similar to the devices with larger attachment surfaces.

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