A cochlear implant is a medical device that replaces the function of the damaged inner ear. Unlike hearing aids which amplifies sound and make them louder, cochlear implants bypass the damaged cochlea (hair cells of the inner ear) and provide sound signals to the brain.
The internal parts which are implanted include a receive and electrodes. The receiver is inserted just under the skin behind the ear. The receiver takes the coded electric signals from the transmitter and delivers them to the the electrodes which are surgically inserted in the cochlea.
The best results of cochlear implant have been found among children who received cochlear implant before 3 years of age. Usually they achieve 90 to 95 percent hearing and language improvement. 80 - 90 percent of those children develop a hearing and speech equal to children with normal hearing.