What Are Cochlear Implants?
The cochlea is located in the inner ear. Those suffering from disease or damage in the cochlea may benefit from cochlear implants. Learn how cochlear implants work to restore hearing.
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Transcript: What Are Cochlear Implants?
How We Hear
When sound waves reach the ear, they are gathered by the funnel-shaped outer ear and channeled into the middle ear. As sound passes to the middle ear, the sound waves hit the tympanic membrane, or ear drum. The vibrations then travel through the middle ear and reach the fluid-filled inner ear.Role of the Cochlea
The inner ear contains an important structure called the cochlea. Inside the cochlea, sound vibrations move tiny hairs that are attached to nerve fibers. In this way sounds are converted to signals that are sent to the brain via the auditory nerve.
Damage to Cochlea
Disease, damage, or deformity of the cochlear hair cells is a common cause of hearing impairment or deafness.What Cochlear Implants Do
These malfunctioning hair cells may send intermittent or unclear signals to the auditory nerve, or send no signal at all. A device called a cochlear implant can restore hearing by replacing these damaged structures with a wire that is implanted in the cochlea.How Cochlear Implants Work
In order to stimulate the hearing process, sound waves are first received by a microphone unit that hangs over the back of the ear. The sounds are then passed via a thin wire to a speech processor that is often worn on the belt. This processor amplifies and filters sound before converting it into digital signals.These digital signals are sent back via the same wire to a transmitter located on the head. The transmitter then sends radio signals to a receiving unit embedded just under the scalp. The receiving unit then stimulates the wire implanted in the cochlea, enabling the cochlea to send clear signals to the auditory nerve.
Surgery for Cochlea Implants
Although the surgery permanently damages the cochlea, cochlear implants can greatly improve hearing, even in people who are profoundly deaf.Risks of Cochlea Implant Surgery
There are several potential complications associated with this procedure that should be discussed with the doctor prior to surgery.Copyrighted animations provided by Blausen Medical.