The sound of soft tissue
The emphasis of our acoustic investigations was on the CIC’s alleged potential for eliminating the occlusion effect. This effect was found to be mainly due to vibrations of the outer soft-tissue (cartilaginous) part of the ear canal. Making the CIC sit deeply in the ear canal – with a complete seal in the inner bony part – should prevent vibrations from the soft part from reaching the eardrum.
Models of the outer-ear geometry
This work has provided insight into the shape of the ear canal and its variation across the population. Prototype software tools were developed for automated production of CIC hearing aids and for assisting the mechanical development of CIC components.