How Do Your Ears Work?
Hearing is a highly complex and process that has six primary steps:
- A wave of sound enters the ear and travels down the ear canal to the eardrum
- The eardrum vibrates from the sound wave, sending the vibration to three tiny bones in the middle ear (the malleus, incus, and stapes)
- These bones amplify the sound wave, passing it to the cochlea, a tiny fluid-filled organ of the inner ear
- The vibrations then move in a wave to sensory hair cells that move up and down within the cochlea
- This movement opens pore like channels that create an electrical signal
- That electrical signal then reaches the auditory (hearing) nerve which transmits the signal to the brain where it is interpreted as sound.
How Does a Cochlear Implant Work?
There are three primary parts to the cochlear implant:
- An external microphone with a sound processor and transmitter
- The coil, which is a disc-shaped external magnet that rests against your head behind the ear
- An implanted receiver/stimulator system which receives the signal from the sound processor and sends it to the hearing nerve through an electrode within the cochlea
With a cochlear implant, the sound wave is received by the external microphone which sits externally, behind the ear. The sound processor then converts the sound into information the receiver can read. The signal is transmitted through the coil to the receiver/stimulator which is implanted under the skin. The stimulator electrode then sends the signal as electricity through the cochlea to the hearing nerve. As with normal hearing, the hearing nerve will transmit the signal to the brain to be interpreted as sound.
What are the Benefits of a Cochlear Implant?
Since 1972, over 118,100 of these devices have been surgically implanted in adults and 65,000 in children. While there is a lot of data available for the benefit of cochlear implants, we are continuing to learn more though research and experience.
These devices can improve:
- Your understanding of speech without reading lips
- Recognition of normal everyday sounds
- The clarity of sound you hear in a noisy environment
- Your ability to pinpoint where a sound is coming from
- Language skills
- Memory and verbal functions
- Your quality of life
The studies also show people living with a cochlear implant prefer them over hearing aids. Cochlear implant patients are:
- Five times more satisfied with their ability to hear what is said on TV
- Seven times more satisfied with their ability to hear spoken sentences
- 11 times happier with their ability to hear while on the phone
The cochlear implant may even help with tinnitus, or ringing or buzzing in the ear.
Is Cochlear Implant Surgery Brain Surgery?
Cochlear implant surgery is very safe and it is not brain surgery. In most cases, surgery is performed as outpatient surgery, meaning you go home the same day. During the procedure, a surgeon will make a small incision behind your ear. The implant is placed along the skull and the electrode is placed within the cochlea. The implant is then activated 2-4 weeks after surgery.
It takes a few weeks for your brain to learn to interpret the signal from the cochlear implant. The Mayo Clinic says,“Within 3 to 6 months of use, most people with cochlear implants make considerable gains in understanding speech.” They also point out that adults of any age and children as young as six months old can successfully receive these innovative healthcare technologies.
Cochlear implants can be placed in one or both ears based on patient characteristics.
Do I Qualify for a Cochlear Implant?
You may qualify for a cochlear implant if you have:
- Hearing loss that interferes with speech and communication
- Little or no benefit from hearing aids (this can be determined through hearing tests)
- A great deal of motivation to be a part of the hearing community
- A realistic understanding of the benefits and learning process for using the implant.