The Effects of Complex Stapes Motion on the Response of the Cochlea in Guinea Pigs

Sequeira, Damien; Breuninger, Christian; Eiber, Albrecht; Huber, Alexander

doi:10.1142/9789812708694_0017

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…Because of the unphysiological orientation of the actuator, the motion imposed to the stapes contains much higher components of rocking of stapes around its short and the long axis of footplate when compared to the natural hearing. Recent studies revealed the influence of such motions on hearing (Sequeira, 2007).…”

Section: Totally Implantable Hearing Aidmentioning

confidence: 99%

Electronic Devices for Reconstruction of Hearing

Eiber¹

2008

Proceedings of the First International Conference on Biomedical Electronics and Devices

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The effect of specific hearing impairments can be alleviated or compensated using electrically driven hearing aids. There is a broad variety of devices for stimulating the hearing either acoustically, mechanically or electrically. Their applications depend on the type, the severity and the location of a particular impairment. In order to get an optimal reconstruction, additionally to the medical aspects the dynamical behavior of the implant has to be regarded together with the individual situation of the patient simultaneously. Because of the broad variation of individuals and situations, the belonging parameters are time dependent and vary in a wide range, too. Thus, the design of a hearing device must be robust or insensitive against parameter variation and a sensitivity analysis with respect to parameters of the device, variation of anatomy and variation of insertion is needed. By means of mechanical simulation models enhanced by the behavior of the actuator and its control, the dynamical behavior of implants can be calculated and optimized. Such simulations helps to shorten series of experiments in the lab and in clinical practice and guidelines for the designer and for the surgeon can be derived.

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Section: Totally Implantable Hearing Aidmentioning

confidence: 99%

Electronic Devices for Reconstruction of Hearing

Eiber¹

2008

Proceedings of the First International Conference on Biomedical Electronics and Devices

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“…Above this frequency, the footplate motion becomes more complex with an increasing rotational aspect along both footplate axes and a maximum of this movement pattern at 6 kHz. There is recent data available that these tilting stapes movements elicit hearing Sequeira et al 2007). Although these findings need further investigation, prostheses optimization should address this aspect to achieve physiologic motion patterns in the future.…”

Section: Aims and Techniques Of Tympanoplastymentioning

confidence: 99%

Osseointegration of Prostheses on the Stapes Footplate: Evaluation of the Biomechanical Feasibility by Using a Finite Element Model

Neudert

Berner

Bornitz

et al. 2007

JARO

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Restoration of hearing is one of the main issues of tympanoplasty. Depending on the extent of destruction, the ossicular chain is partially or totally replaced by prostheses. In the unfavorable event of complete ossicular chain destruction with only the stapes footplate remaining in the oval niche, implanting of a columella prosthesis represents the gold standard. Besides ventilation problems, the main causes of unsatisfactory hearing results are dislocation of the prosthesis and poor coupling to the footplate. Therefore, stable fixation of prostheses is desirable but has not been realized to date. In line with our experimental intention to realize a bony prosthesis fixation on the footplate, we designed a finite element model for the simulation of the interacting forces once an osseointegration was achieved. These preliminary results predict the mechanical feasibility of this endeavor and the necessary general preconditions, which have to be carefully considered. A specially designed titanium prosthesis anchor needs a minimal bony fixation of 104 mm accretion height on the footplate to withstand all emerging forces. Therefore, providing a sort of artificial stapedial suprastructure in the form of a firm, preferably bony, integration of a prosthesis anchor on the footplate seems to be realistic and worthwhile from a mechanical and medical point of view.

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