These are assistive listening devices used to improve the signal-to-noise ratio for the listener and to reduce the effects of poor acoustics. This system is made up of two parts: 1) the transmitter which is used by the speaker or placed near the device to be amplified (eg.TV, computer, stereo) and 2) the receiver which is used by the individual trying to hear. This system helps to bring the speaker’s voice directly to the listener’s ears either through hearing aids or headphones. The listener is able to hear the speaker above the background noise at considerable distances. There are no wires connecting the listener to the speaker which gives mobility to both. These units are often of benefit for classes, lectures, conferences, meetings, in restaurants, and in large groups.
A device surgically implanted into the cochlea to bypass the sensory organ to activate the hearing nerve directly. It is designed for individuals with severe-profound sensorineural hearing loss (in both ears) who do not receive benefit from traditional hearing aid amplification. The system consists of a processor that looks like a behind the ear hearing aid, an external magnet that attaches to an internal magnet implanted in the mastoid bone and the actual electrode that is surgically implanted in the cochlea (inner ear). Once implanted, the device is programmed for the individual over several months.
Bone Conduction Amplification Device (BCAD)
This device combines a sound processor with a small titanium fixture implanted behind the ear. The system allows sound to be conducted through the bone rather than via the middle ear – a process known as direct bone conduction. The surgery is minor, and many patients report a wide range of advantages over other hearing devices. BCAD is used for people with chronic ear infections, congenital conductive hearing loss, and/or single-sided deafness.