Don't you sometimes have trouble hearing what someone is saying clearly? Or do you find it difficult to catch some words even when using a hearing aid? This discomfort may be even greater when talking to a group of people or in a noisy place. Today we are talking about a technology that has brought very successful results to people with severe hearing loss, as well as young children with congenital hearing loss. That is the cochlear implant.
Simply put, what is a cochlear implant?
A cochlear implant is an electronic device that helps manage hearing loss. If you have moderate, severe, or profound hearing loss in one or both ears and your regular hearing aids are not providing enough benefit, your doctor may recommend this treatment.
There's something we need to understand clearly here. A cochlear implant won't restore your lost hearing. But it will greatly improve your ability to understand what someone is saying and to recognize other sounds.
Think of it this way: a hearing aid is like turning up the volume on a TV. It makes the sound louder. A cochlear implant is something completely different. It creates a new pathway that bypasses the damaged parts of the ear and sends sound signals directly to the brain.
How does this little device work?
Inside our ears, inside the skull, there is a part called the cochlea, which is shaped like a snail's shell. Most often, hearing problems occur due to damage to the very delicate sensory hair cells inside this cochlea. We call this condition sensorineural hearing loss. Normally, sound waves from outside are converted into electrical signals inside the cochlea, which are then sent to the brain via the auditory nerve. The brain interprets these signals as "sound."
What a cochlear implant does is bypass the area where the damaged hair cells are. Here's how it works, step by step:
- Step 1: The microphone and sound processor you wear behind your ear pick up sounds from the outside environment.
- Step 2: This processor sends sound signals to a transmitter that is attached to the scalp via a magnet.
- Step 3: The transmitter converts those signals into electrical impulses and sends them to the receiver, which is surgically implanted under the skin.
- Step 4: The receiver sends those impulses to electrodes placed inside the cochlea.
- Step 5: These electrodes replace the damaged hair cells and directly stimulate the auditory nerve.
- Step 6: The auditory nerve carries those impulses to the brain. Your brain then interprets those signals as a story, a song, or some other sound.
Cochlear implant parts and surgery
There are two main parts to this device. One is the part that is worn externally, and the other is the part that is surgically implanted inside the body.
| Part of the device | What it contains |
|---|---|
| Outer wear part | Microphone, Sound Processor, and Transmitter |
| Surgically inserted part | Electrodes and Receiver |
How is the surgery done?
This is usually done by an ear, nose, and throat specialist (otolaryngologist). You will be given general anesthesia during the procedure, so you will not feel any pain.
- The doctor will make a small incision in the skin behind your ear.
- Through it, a small opening is made in the skull bone.
- Using that opening, the internal parts of the device (the receiver and electrodes) are attached to the correct locations.
- Then the incision is closed with stitches.
This is usually a surgery that takes a few hours, and in most cases you can go home the same evening.
What happens after the surgery?
About two weeks after surgery, you will have to see your doctor again. At that time, an audiologist will come in, attach the external parts of the device, and activate it. That is when you will hear sounds through the device for the first time. The audiologist will use a computer to map the device so that you can hear it best.
What are the benefits and risks?
As with any medical treatment, there are benefits and minor risks. However, the risks are very low when compared to the benefits of a cochlear implant.
| Main benefits | Possible (very rare) risks |
|---|---|
| Being able to answer and make phone calls. | Nerve damage at the surgical site. |
| Being able to participate in conversations even in places with high noise levels. | Meningitis - (The doctor recommends a vaccine to reduce this risk). |
| It reduces tinnitus in people with ringing in the ears. | Loss of residual hearing that existed before surgery (but this is now less common due to modern methods). |
| Children with congenital hearing loss (after 9 months of age) can learn to speak as quickly as normal children. | Cerebrospinal fluid leak. |
| Hearing warning sounds (vehicle horns, sirens) in the surrounding environment. | Balance issues/Vertigo, such as dizziness. |
How long does it take to get results?
This isn't something that changes overnight. It takes some time for your brain to learn to understand these new signals. At first, the sounds you hear may seem a bit mechanical, like a robot talking. This is very normal.
It usually takes about a month for you to see a noticeable improvement in your hearing. It can take up to 3 to 6 months for some people to fully recover. During this time, you will need to work with an audiologist or speech-language pathologist. They will help you train your brain. To get the most out of this treatment, it is essential that you attend these training sessions with dedication.
Things to consider when living with constipation
To get the most out of this treatment, consider these points:
- Always wear the device: Wear the outer part of the device whenever you are awake. This is very important for your brain to get used to it.
- Attend training sessions: Don't skip therapy sessions because the brain is learning new things.
- Know what not to do: You should remove the outer part when bathing or swimming. It is also wise to avoid contact sports that involve a hard blow to the head, as a blow can damage the internal device.
- Be happy with what you can do: This is not a limitation on your life. Instead, it is an opportunity to reconnect with the world you have been missing. Your doctor and audiologist will tell you more about this.
The most important thing is that if you experience any changes in your hearing, ear pain, discomfort, redness, swelling, or pus at the surgical site, see your doctor immediately.
A cochlear implant is truly life-changing. It can open the door to a world of sound that you've missed. For your child, it can be their first step into a world of sound. While this journey may take some time, your medical team will be with you every step of the way.
Take-Home Message
- A cochlear implant is an electronic device for severe hearing loss, and it works differently than a regular hearing aid.
- This bypasses the damaged parts of the ear and delivers sound signals directly to the auditory nerve.
- This process requires minor surgery and subsequent audiological therapy training.
- It can take several months to see results and for the brain to get used to new sounds, so commitment is key.
- In case of any problems or for more information, always consult your ENT Surgeon and Audiologist.
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