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Mechanisms, testing, and implementat...

Dalhousie University (Canada).

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Mechanisms, testing, and implementation of bone conduction hearing: Clinical and experimental investigations.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Mechanisms, testing, and implementation of bone conduction hearing: Clinical and experimental investigations./
Author:	Majdalawieh, Osama.
Description:	195 p.
Notes:	Source: Dissertation Abstracts International, Volume: 69-05, Section: B, page: 3130.
Contained By:	Dissertation Abstracts International69-05B.
Subject:	Engineering, Biomedical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=NR39090
ISBN:	9780494390900

Mechanisms, testing, and implementation of bone conduction hearing: Clinical and experimental investigations.
Majdalawieh, Osama.

Mechanisms, testing, and implementation of bone conduction hearing: Clinical and experimental investigations. - 195 p.

Source: Dissertation Abstracts International, Volume: 69-05, Section: B, page: 3130.

Thesis (Ph.D.)--Dalhousie University (Canada), 2008.

Bone conduction (BC) hearing has been utilized as a hearing rehabilitation technology for several decades. However, BC hearing is difficult to understand, and its underlying mechanisms, compared to air conduction (AC), are still quite unclear and poorly understood. Patients with conductive hearing loss are often fitted with a bone anchored hearing aid (BahaRTM). The BahaRTM makes use of a titanium abutment, surgically implanted behind the ear into the mastoid bone, to transmit the sound by BC directly to the bone. So far, it has been almost impossible to measure skull vibrations in living subjects, since vibrations of the overlying skin do not reflect underlying skull vibrations. The main focus of this thesis is to determine the characteristics of hearing through BC using multiple experiments on live heads to enhance our understanding of BC hearing. The results presented in this thesis have both clinical and scientific implications. Measurements on different BahaRTM processors reveal that they differ in the acceleration output they can achieve with differing loads. There are significant differences in the responses of the live head, and plastic and dry skulls previously used in literature. The live head shows a smoother response, with damping of the multiple small resonances seen in the dry skulls. The Baha RTM snap coupling appears to be efficient in transmitting vibrations to the skull. In comparing AC and BC fine frequency thresholds, the overall shape in any one individual appears to be concordant, suggesting that thresholds are determined by the underlying cochlear response, and not imposed by the BC pathways or skull resonances. Skull vibrations measurements in vivo showed significant variations (15-25dB) between individuals, which could be due to individual differences in skull geometry, the skin and subcutaneous tissues, as well tension in neck muscles. Based on quantitative data from loudness matching and vibration measurements, the mastoid tip appears to be the "best" contact point for BC vibrators, and the closer the excitation position is to the cochlea, the higher the sensitivity to BC. Measurements on ten patients with mixed hearing loss show incremental benefit in the hearing threshold to fitting two BahaRTMs instead of one.

ISBN: 9780494390900Subjects--Topical Terms:

1017684
Engineering, Biomedical.

Mechanisms, testing, and implementation of bone conduction hearing: Clinical and experimental investigations.
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100 1 $a Majdalawieh, Osama. $3 1023968
245 1 0 $a Mechanisms, testing, and implementation of bone conduction hearing: Clinical and experimental investigations.
300 $a 195 p.
500 $a Source: Dissertation Abstracts International, Volume: 69-05, Section: B, page: 3130.
502 $a Thesis (Ph.D.)--Dalhousie University (Canada), 2008.
520 $a Bone conduction (BC) hearing has been utilized as a hearing rehabilitation technology for several decades. However, BC hearing is difficult to understand, and its underlying mechanisms, compared to air conduction (AC), are still quite unclear and poorly understood. Patients with conductive hearing loss are often fitted with a bone anchored hearing aid (BahaRTM). The BahaRTM makes use of a titanium abutment, surgically implanted behind the ear into the mastoid bone, to transmit the sound by BC directly to the bone. So far, it has been almost impossible to measure skull vibrations in living subjects, since vibrations of the overlying skin do not reflect underlying skull vibrations. The main focus of this thesis is to determine the characteristics of hearing through BC using multiple experiments on live heads to enhance our understanding of BC hearing. The results presented in this thesis have both clinical and scientific implications. Measurements on different BahaRTM processors reveal that they differ in the acceleration output they can achieve with differing loads. There are significant differences in the responses of the live head, and plastic and dry skulls previously used in literature. The live head shows a smoother response, with damping of the multiple small resonances seen in the dry skulls. The Baha RTM snap coupling appears to be efficient in transmitting vibrations to the skull. In comparing AC and BC fine frequency thresholds, the overall shape in any one individual appears to be concordant, suggesting that thresholds are determined by the underlying cochlear response, and not imposed by the BC pathways or skull resonances. Skull vibrations measurements in vivo showed significant variations (15-25dB) between individuals, which could be due to individual differences in skull geometry, the skin and subcutaneous tissues, as well tension in neck muscles. Based on quantitative data from loudness matching and vibration measurements, the mastoid tip appears to be the "best" contact point for BC vibrators, and the closer the excitation position is to the cochlea, the higher the sensitivity to BC. Measurements on ten patients with mixed hearing loss show incremental benefit in the hearing threshold to fitting two BahaRTMs instead of one.
590 $a School code: 0328.
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