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Hearing
Published in Anne McLaughlin, Richard Pak, Designing Displays for Older Adults, 2020
Another type of hearing aid is the bone-anchored hearing aid (BAHA). These types of aids are surgically implanted and transmit sound vibrations directly to the bones of the ear, with no need for the cilia to respond to the vibrations. BAHAs are only appropriate for people who have hearing loss in one ear; in these cases, BAHAs excel, supporting the localization of sound. Because sound waves hit both ears at slightly different times, the time differential between the ears gives a good indication of where the sound originated. One down side to these devices is the difficulty of using them with handheld phones. Holding the phone to the ear can produce nausea and dizziness in some people with a BAHA.
3D printing and virtual surgical planning in a difficult Bonebridge case
Published in Virtual and Physical Prototyping, 2019
A 30-year-old male presented with a discharging modified radical mastoid cavity with maximal conductive loss and resistant to medical therapy. He had a background history of undergoing 2 intact canal wall procedures and a modified radical mastoidectomy aged 9, 12 and 15 years. Examination revealed a very tight meatoplasty and significant irregular bone growth posteriorly causing a sump (Figure 1). High resolution Petrous Temporal Bone Computed Tomography (CT) confirmed significant soft tissue debris in the residual mastoid bone and only remnant malleus handle and stapes footplate (with no visible superstructure) and a poorly ventilated middle ear. He underwent a BAHA (Bone Anchored hearing aid, Cochlear ltd, Sydney, Australia) trial with good outcome and wished to have his hearing restored simultaneously. The contralateral ear was disease free with the patient having no other co-mordibities. All options were discussed including ossicular chain reconstruction, air conduction and bone conduction hearing aids including BAHA and Bonebridge and the patient wished to proceed with a BB. Options of 3D printing and VSP were discussed and the patient consented to this prior to his procedure.
Device profile of the Bonebridge bone conduction implant system in hearing loss: an overview of its safety and efficacy
Published in Expert Review of Medical Devices, 2020
Stephen Jones, Patrick Spielmann
BAHA Attract – a transcutaneous bone conducting hearing device with an implanted magnet and an active external device. The audiological gain (power) of this device is limited by attenuation through the intact skin and soft tissues of the patient. This means that the patient’s bone conduction thresholds must be better than for Bonebridge in order to gain good hearing from the device.