Abstract: Transducer substantially comprising a hollow housing, a device located inside the hollow housing to transform the electrical signals output by a vibration pickup microphone, a generally discoid shaped element for acoustical coupling with the mastoid bone, having one face directed to the outside of the housing and one face arranged onto the inside of the housing itself, and a coupling element for connection between the vibrating unit and the acoustic coupling element. The acoustic coupling element comprises one soft material headset apt to close and seal one opening made on one face of the hollow housing, and to hold the vibrating element freely hanging into said housing, by means of the coupling element.

Abstract: Miniaturized hearing aid intended for a deep insertion into the auditory meatus of people who suffer from hearing problems, or "peritympanum" hearing aid, comprising a hollow body, a closure plate therefore provided with a cavity for housing the battery and with a small closing cover for said cavity operating as a movable battery holder shifting between a closed position supplying the contacts and an open position cutting the power supply of the battery, wherein the necessary thong for removing the hearing aids from the auditory meatus controls the movement of the battery holder from the closed position to the open position.