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Hearing Aid

Getting Bone Anchored Hearing Aids

Bone anchored Hearing Aids are hearing aids that carry sound through the bone of the skull. Conventional hearing aids amplify sound so the user can hear better. With this type of hearing aid, sound is vibrated through the skull, skipping the outer and middle ear. Just imagine hearing your voice loudly even when wearing earplugs - this is how bone conduction works. These types of hearing aids are prescribed to people with unilateral hearing loss, conductive hearing loss and other hearing losses that cannot be fixed with conventional hearing aids.

Getting Bone Anchored Hearing Aids

Getting this type of hearing aid starts with a surgical procedure that imbeds a titanium implant with an external abutment onto the skull. A sound processor is located in the abutment. This processor works as the transmitter of sound, from external sources, to the abutment and then into the titanium implant. The implant then causes the inner ear and the skull to vibrate. This vibration activates the nerves of the inner ear, and causes it to hear.

The process of imbedding the titanium implant is called osseointegration. Bone anchored hearing aids can only be used two to six months after the osseointegration procedure. This is typically an easy one-stage procedure, using only a small amount of anesthesia. Patients can leave after a few hours of rest. The intake of pain relievers may be required for a couple of days.

Osseointegration is a generally safe procedure, with a success rate of above 95%. Failure can be caused by infection - but then, doctors can try the procedure again after curing infections and other side effects. In many of these procedures, the surgeon will put in a second idle receptacle. This idle receptacle will not be used until first one is damaged or fails.

Unlike adults, babies and toddlers go through two stages for the osseointegration procedure. In the first surgical stage, doctors peel back a one centimeter by one centimeter section behind the child’s ears, and then drill holes for the receptors. After six to eight months, the second surgery is done to attach the titanium implant.

For both children and adults, the wounds are allowed to heal for a couple of months before bone anchored hearing aids can be attached and used.

Who Can Get Bone Anchored Hearing Aids

In general, bone anchored hearing aids are for patients who cannot use the conventional hearing aids. They may have inflammation or infection in their ear canal. They may also suffer from malformed ear canals or outer ears. This type of hearing aid is also prescribed for people with deafness only in one ear. Likewise, this type of hearing aid is for people who suffer from bilateral conductive hearing loss because of ossicular diseases.

Risks in Getting Bone Anchored Hearing Aids

Since surgery is involved in getting this type of hearing aid, the patient risks contracting infection while the wound is still unhealed. The wound needs to be cleaned daily. A topical antibiotic should be applied in the affected area as the wound heals. Likewise, care should be taken with the titanium imbed. This should be cleaned daily with a soft brush. Its surrounding areas should also me disinfected regularly.

Care should be taken in handling the hearing aids. Even when these are designed to come off their posts, a slight impact may damage them. Cochlear Limited is the only manufacturer of this type of hearing aid for now. They offer warranty and repair within a period of time.

How Much Will It Cost

In terms of the hearing aid unit alone, cost can reach up to US$5,000. however, with the additional cost of hospitalization and surgery, expenses can add up to $35,000, on the average.

Hearing Aid Models

Since Cochlear Limited is the only current provider of this type of hearing aid, there are limited models to choose from:

1. BAHA Classic and BAHA Compact - These models have been discontinued because of developments in BAHA technology. They remain in use but with limited repair options.

2. BAHA Cordelle - This model is for those with severe hearing loss. Sound is amplified more. The Cordelle model is made up of a transducer and an additional attached unit that is worn around the body.

3. BAHA Divino - This model is digital BAHA model with built-in directional microphone.

4. BAHA Intenso - This model is supposedly the more powerful and clearer model. Feedback issues have also been reduced.

Bone anchored hearing aids are clearly the choice hearing aid for those suffering from severe hearing loss, and outer ear and ear canal defects and diseases. Advancements have made the surgical procedures that go with this type of hearing aid relatively safe.
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