In this study, a new subcutaneously implanted bone-conduction hearing aid with an external unit and an internal unit is proposed. A prototype transducer was made and installed in a cadaver head, and the performance of the transducer was investigated when the method of installation (number of fixed point) of the transducer was changed. The frequency response of the amplitude of the cadaver generated by the transducer depended on the number of the fixed point. The ear-canal sound pressure generated by the transducer with single point fixation was higher than that with two point fixation. These results suggest that single point fixation method is suitable for installing the transducer to the cadaver.
