The implant device is comprised of both external and internal (implanted) components. The external components include a microphone and cable, sound processor, and transmitter. The internal (implanted) components include a receiver-stimulator and an electrode array (a bundle of fine wires). The electrode array is surgically implanted into the cochlea (the hearing portion of the inner ear) to directly stimulate the endings of the auditory nerve.

Cochlear implantation surgery is performed under general anesthesia. An incision is made behind the ear. The mastoid bone is exposed and a small fragment of bone is drilled away to gain access to the inner ear. Next, a small opening is made directly into the cochlea. The electrode array is then threaded into the cochlea. The body of the implant is attached to the skull. The incision is closed and a soft mastoid dressing is applied. The surgically implanted component is designed to last a lifetime.

The patient is usually discharged the day of surgery. Patients are evaluated approximately one week to ten days following surgery to make sure proper healing of the incision has occurred.

Additional semiannual evaluations allow monitoring of middle ear status and scalp viability in young children.