The cochlear implant bypasses the damaged parts of the inner ear and directly stimulates the remaining hearing nerve fibers in the cochlea with electrical signals.
The cochlear implant consists of two basic components: an outer (external) and an inner (internal) device. The external device consists of a speech processor (see #2, figure below) (worn either as a behind-the-ear device(#2) or a single circular disc behind the ear), a transmitting coil(#4), a directional microphone(#1) and connecting cords(#3). The internal device consists of a receiver/stimular(#5) (placed directly below the skin) and a multi-electrode wire array(#6), which is inserted into the inner ear (cochlea). The transmitting coil of the external device is secured over the receiver/stimulator of the internal device through magnetic attraction.
The Cochlear Implant System works in the following manner:
The Ear Institute of Chicago offers cochlear implants from three different manufacturers. These implants include the Nucleus 5 implant made by Cochlear Corporation, and the HiRes 90K implant made by the Advanced Bionics Corporation, and the MAESTRO implant from the MED-EL Corporation. Each device is approved by the Food and Drug Administration (FDA). The patient is allowed to choose the implant they desire. For more information regarding each device, please see our “comparison of cochlear implants” page.
Click here for more information regarding "Who is a Candidate for a Cochlear Implant".