Hearing Aid Batteries
A Bone Anchored Hearing Aid is a type of hearing aid based on bone conduction. It is primarily suited to people who have conductive hearing losses, unilateral hearing loss and people with mixed hearing losses who cannot otherwise wear 'In the ear' or 'behind the ear' hearing aids. more...
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The acronym BAHA™ is a trademark.
Use & Operation:
Baha's use a surgically implanted abutment to transmit sound by direct conduction through bone to the inner ear, bypassing the external auditory canal and middle ear.
A titanium \"post\" is surgically embedded into the skull with a small abutment exposed outside the skin.
A sound processor sits on this abutment and transmits sound vibrations to the external abutment of the titanium implant.
The implant vibrates the skull and inner ear, which stimulate the nerve fibers of the inner ear, allowing hearing.
The titanium fixture bonds with the surrounding tissue over three to six months after surgery in a process called osseointegration.
The hearing aid can be used once osseointegration is complete, usually three to six months after implantation.
Entific's BAHA hearing aids have a patented snap-lock coupling which allows it to clip into the abutment.
The BAHA is then treated as a regular hearing aid, running on small circular batteries which last approx 6-14 days.
The snaplock coupling is designed to detach upon impact as a safety feature to prevent damage to the implant or surrounding tissues.
Suitability
Bone anchored hearing aids can help:
people who have chronic inflammation or infection of the ear canal and cannot wear standard 'in the ear' air conduction hearing aids.;
people who have malformed or absent outer ear and ear canals as is common in medical conditions such as Treacher Collins syndrome or Microtia.;
people who have single-sided deafness.;
Bone anchored hearing aids have also been offered successfully to people with bilateral conductive loss due to ossicular disease e.g. otosclerosis and for hearing impairments related to other congenital syndromes such as Down’s Syndrome.
In Canada, stage one surgery for BAHA has been implanted into children as young as 13 months at the Hospital for Sick Children in Toronto. Stage two surgery has been done as early as 22 months. For infants, an interim measure young infants can be provided with a BAHA softband allowing them to use a BAHA. This is a tight headband which the infant wears to hold a BAHA against the skull.
Surgical Procedure
In recent years improvements to the surgical procedures have resulted in most patients being able to have a single stage procedure carried out under local, or a short general anaesthetic. Most patients are able to leave hospital within a few hours, or the day after their procedure with many not even requiring analgesia in the following days.
Read more at Wikipedia.org
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