Hear me out: all about hearing implants

Hearing implants are specialised medical devices designed to help individuals with significant hearing loss who do not benefit adequately from conventional hearing aids. While traditional hearing aids work by amplifying sound, implants directly stimulate parts of the hearing system, bypassing damaged areas. In this article, a consultant ENT surgeon explains how hearing implants work, and why they are useful in cases where hearing aids offer limited improvement.

There are several types of hearing implants. The most common are:

Cochlear implants: For individuals with severe to profound sensorineural hearing loss. These bypass the damaged inner ear and directly stimulate the hearing nerve.
Bone conduction implants: Suitable for patients with conductive or mixed hearing loss, or single-sided deafness. These transmit sound through bone vibrations to the inner ear.
Middle ear implants: Less commonly used, these are implanted into the middle ear to mechanically stimulate the hearing bones.

Each type of implant is tailored to specific patterns of hearing loss, and proper assessment is key in determining suitability.

Who might be suitable for hearing implants?

Not everyone with hearing loss requires or is eligible for a hearing implant. Candidates are typically individuals who have moderate to profound hearing loss, and who have limited benefit from hearing aids despite appropriate fitting and use.

For cochlear implants, patients often have sensorineural hearing loss affecting both ears. They may have difficulty understanding speech, even with strong amplification. Children born with significant hearing loss may also be considered, as early implantation can be critical for speech and language development.

Bone conduction implants are often considered for patients with:

Chronic ear infections that make traditional hearing aids impractical
Congenital abnormalities of the ear canal or middle ear
Single-sided deafness, to route sound from the deaf side to the hearing ear

Assessment involves a combination of audiological tests, medical imaging (such as MRI or CT), and consultations with an audiologist and ENT surgeon. These assessments ensure that the hearing loss is suitable for implantation and help guide the choice of device.

The surgical procedure: what to expect

The surgical placement of a hearing implant depends on the type of device being used, but most procedures are carried out under general anaesthetic and are typically day-case or require an overnight stay.

Cochlear implant surgery involves making a small incision behind the ear. A pocket is created in the bone to house the internal receiver, and an electrode array is inserted into the cochlea (inner ear). The surgery usually takes two to three hours.

For bone conduction implants, a small titanium fixture is implanted into the bone behind the ear. This may either be left visible (abutment) or fully under the skin (magnetic system). The procedure is shorter, often under an hour.

Middle ear implants involve placing a small device within the middle ear cavity, often attaching it to the ossicles (hearing bones).

Risks are generally low, but, as with all surgeries, infection, bleeding, or device failure can occur. These are discussed fully during the pre-operative counselling.

Recovery and activation

Following surgery, most patients go home the same day or the next morning. Discomfort is usually mild and well-controlled with simple pain relief. Healing time varies slightly, but external activation of the device usually takes place after two to four weeks, once the surgical site has healed.

The first fitting and programming of the device is a crucial step. At this stage, audiologists begin tuning the implant, and patients start their journey toward better hearing. For cochlear implants, initial sounds may seem artificial or robotic. However, with consistent use and auditory training, the brain adapts, and hearing clarity improves over time.

Bone conduction and middle ear implants may offer more immediate sound clarity, depending on the patient’s condition and the type of device used.

Living with a hearing implant

Patients should understand that hearing implants do not restore normal hearing, but they can offer significant improvement in hearing ability, especially in challenging listening environments. Most individuals report better speech understanding, greater confidence, and improved quality of life.

Regular follow-up appointments are essential. These include device programming, hearing therapy, and occasional checks of the surgical site. Some patients may benefit from support groups or auditory rehabilitation programmes to enhance their outcomes.