Abstract:
:One limitation with the Bone Anchored Hearing Aid (Baha) is too poor amplification for patients with moderate to severe sensorineural hearing losses. Therefore, we investigated if bone conducted (BC) sound transmission improves when the stimulation approaches the cochlea. Also the influence from the squamosal suture on BC sound transmission was investigated. Both sides of the heads on seven human cadavers were used and vibrational stimulation was applied at eight positions on each side with a frequency range of 0.1-10 kHz. A laser Doppler vibrometer was used to measure the resulting velocity of the cochlear promontory. It was found that the velocity of the promontory increases as the stimulation position approaches the cochlea; this was especially apparent at distances within 2.5 cm from the ear canal opening and when the stimulation position was in the opened mastoid. At frequencies above 500 Hz there was on average 10 to 20 dB greater vibrational response at the cochlea when the stimulation was close to the cochlea compared with the normal Baha position. Moreover, even if there were general indications of attenuation of BC sound when passing the squamosal suture, an effect from the suture could not be conclusively determined.
journal_name
Int J Audioljournal_title
International journal of audiologyauthors
Eeg-Olofsson M,Stenfelt S,Tjellström A,Granström Gdoi
10.1080/14992020802311216subject
Has Abstractpub_date
2008-12-01 00:00:00pages
761-9issue
12eissn
1499-2027issn
1708-8186pii
906645869journal_volume
47pub_type
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journal_title:International journal of audiology
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pub_type: 杂志文章,多中心研究
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