The cochlear implant is made up of 2 main parts:
1. THE IMPLANT: consists of an electronic package and magnet which is placed in the temporal bone, and an electrode array which is placed in the cochlear.
2. THE EXTERNAL PART: consists of a microphone, cables, coil and a speech processor. The hearing process using a cochlear implant is summarised below:
1. The microphone picks up sound and enters the speech processor
2. The speech processor filters, analyses and digitises the sound into coded signals.
3. The coded signals are sent from the speech processor to the transmitting antenna, or coil.
4. When the coded signals get to the coil, they are converted to FM radio signals
5. The FM radio signals are sent to the cochlear implant under the skin.
6. The cochlear implant delivers the electrical energy to the electrodes in the cochlea, based on the coded signals from the speech processor.
7. The electrodes stimulate the auditory nerve fibres, sending electrical sound information to the brain.
Check out this video
how does a cochlear implant work from SCIC website
Harry's Ears 