Some patients suffering from deafness or severe hearing loss can find help with
cochlear (inner ear) implants. One such device consists of electronics placed in
a ceramic housing under the skin behind the patient's ear. Sounds transmitted from
a mic outside the body to the internal electronics are then shuttled through wires
into platinum electrodes implanted directly in the patient's inner ear. These
electrodes stimulate nerve fibers to produce sound sensation to the brain.