The Cochlear Implant is an electronic instrument that provides alternative hearing by electronically stimulating the hearing nerve in the inner ear.
The implant has two main components:
•    The external part, which contains a speech processor (microphone, processing unit – which translates sounds into an electronic current, batteries and a transmission ring magnetically attached to the head.
•    The internal part, the implant, includes electrodes implanted in the inner cochlear and a receiver that controls the electronic current. At the time of the operation, the receiver is placed under the skin behind the ear, and contains a magnet to which the external transmission ring is attached.

How does it work?
1.    The microphone absorbs the sounds and sends them to the speech processor. The processor processes the acoustic data and transfers it to electric signals.
2.    The signals – containing the data determining the level of electric current sent to the electrodes – pass through the transmission ring. The ring then transmits the signals to the implanted receiver which interprets them.
3.    The relevant electrodes absorb the appropriate electric current. The sound frequencies will determine the location of the electrodes to stimulate the nerve, and the volume of the sounds will determine the necessary quantity of current.
4.    The electrodes that receive the current then stimulate the hearing nerve. This information is sent to the brain, in which the process of interpreting the meaning of the sounds occurs. This is a complex process dependent on many factors.
It is important to note that the small amount of implanted electrodes cannot entirely replace the thousands of hair cells that aid hearing in a normal ear. Nevertheless, the majority of implant patients are capable of good functional hearing.