Transmission of bone-conducted sound in the human skull measured by cochlear vibrations.
Artikel i vetenskaplig tidskrift, 2008

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.

Humans

Cochlea

80 and over

Vibration

physiology

physiology

Regression Analysis

Cranial Sutures

Cadaver

Middle Aged

physiology

Acoustic Impedance Tests

Aged

Male

Aged

Bone Conduction

Female

Skull

Författare

Måns Eeg-Olofsson

Göteborgs universitet

Stefan Stenfelt

Chalmers, Signaler och system, Signalbehandling och medicinsk teknik, Medicinska signaler och system

Anders Tjellström

Göteborgs universitet

Gösta Granström

Göteborgs universitet

International Journal of Audiology

1499-2027 (ISSN) 1708-8186 (eISSN)

Vol. 47 12 761-9

Ämneskategorier

Oto-rhino-laryngologi

DOI

10.1080/14992020802311216

PubMed

19085400

Mer information

Skapat

2017-10-07