Two parts, one system
External
Microphone · processor · coil
Worn outside the body; captures and transmits sound information.
Implanted
Receiver–stimulator · electrode array
Placed surgically; delivers electrical stimulation inside the cochlea.
Conceptual component map. Device designs and electrode configurations vary.
Beyond the device
Assessment → surgery → activation and programming → rehabilitation and follow-up. Candidacy requires specialist evaluation, including aided benefit and individual goals.
Interactive signal pathway
Follow the signal
Select any stage or play the sequence. Timing is slowed for teaching; no audio is generated.
The external processor and internal implant work together. The electrode array provides electrical stimulation, not amplified sound.
Check your understanding
Why is rehabilitation needed after activation?
The listener learns to interpret the new electrical representation of sound through practice and follow-up.
Compare the pathways
| Pathway | Input to the cochlea | Key distinction |
|---|---|---|
| Unaided hearing | Mechanical vibration | Hair-cell transduction |
| Air-conduction hearing aid | Amplified acoustic sound via the middle ear | Uses remaining cochlear function |
| Cochlear implant | Electrical pulses via an electrode array | Bypasses hair-cell transduction |