Technical Systems for ENT and Audiology

 

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For the fitting and development of hearing aids for adults only very few standardized couplers or ear simulators exist which imitate the auditory canal with its acoustic properties and so allow an optimal adjustment of the hearing aid.

For children and infants such couplers and measuring devices do not exist or are not standardized. The narrower auditory canal in children results in enormous differences with regard to the acoustic properties compared to adults. The fitting of a hearing aid for infants using the measuring techniques for adults can easily lead to a mismatch of 20 dB (SPL).

We examine children's auditory canals and point out the differences to adults. Methodologically this is done with acoustic measuring as well as simulations (FEM). For simulations we revert back to geometric data from CT-scans and model the auditory canals.