The cochlear implant is an electronic device that restores partial hearing to the deaf.

The ear is divided into three parts: external ear, middle ear, and inner ear.

Sound travels along the ear canal of the external ear and causes the ear drum to vibrate. The three small bones of the middle ear conduct this vibration from the ear drum to the cochlea or auditory chamber of the inner ear. Fluid waves in the cochlea, initiated by movement of the three small ear bones, stimulate the more than sixteen...