Method for adaptive construction of a small CIC hearing instrument
A small hearing aid is provided which fits completely in an ear canal of a user wherein a shell as an outer housing of the hearing aid is shaped to closely surround components of the hearing aid to provide a gap between the hearing canal inner walls and the shell to allow flow of air when the hearing aid is mounted in the ear by a mounting element connected to the shell. The mounting element is provided with at least one aperture to allow the air flow. In a fabricating method, an image of the shell is shrunk to closely surround the hearing aid components while maintaining a shape of the ear canal to assure a custom fit.
1. A method for fabricating a completely-in-the-canal hearing instrument for insertion into an ear canal of an ear comprising an outer ear and an ear drum, the ear canal comprising an ear canal wall, where the hearing instrument resides completely in the ear canal, comprising:
determining the dimensions of the ear canal;
fabricating a completely-in-the-canal hearing instrument shell, the shell comprising
an end facing the outer ear and an end facing the ear drum;
a length;
an outer surface comprising a peripheral dimension along the length of the shell, where the peripheral dimension is less than the dimensions of the ear canal along the length of the shell;
a faceplate on the end of the shell facing the outer ear;
a mounting face on the end of the shell facing
the ear drum; and
affixing a dome to the mounting face of the shell, the dome comprising
a dome wall;
an outer peripheral surface conforming to and engaging the walls of the ear canal; and
at least one vent in the dome wall; and
creating a passage comprising a gap between the ear canal wall and the outer surface of the shell, the passage extending continuously along the length of the shell from the vent in the dome to the faceplate.
2. A method as forth in claim 1 , where the step of creating the passage comprises reducing the shell peripheral dimension along the length of the shell.
3. A completely-in-the-canal hearing instrument for insertion into an ear canal of an ear comprising an outer ear and an ear drum, the ear canal comprising an ear canal wall, where the hearing instrument resides completely in the ear canal, comprising:
a completely-in-the-canal hearing instrument shell, the shell comprising
an end facing the outer ear and an end facing the ear drum;
a length;
an outer surface comprising a peripheral dimension along the length of the shell, where the peripheral dimension is less than the dimensions of the ear canal along the length of the shell;
a faceplate on the end of the shell facing the outer ear;
a mounting face on the end of the shell facing
the ear drum; and
a dome affixed to the mounting face of the shell, the dome comprising
a dome wall;
an outer peripheral surface conforming to and engaging the walls of the ear canal; and
at least one vent in the dome wall; and
a passage comprising a gap between the ear canal wall and the outer surface of the shell, extending continuously along the length of the shell from the vent in the dome to the faceplate.
4. A hearing instrument as forth in claim 3 , where the shell peripheral dimension is reduced along the length of the shell.