| Audiometric thresholds measured with single and dual BAHA transducers: The effect of phase inversion. | |
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MedLine Citation:
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PMID: 20874054 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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The bone-anchored-hearing-aid (BAHA) transduces airborne sound into skull vibration. Current bilateral BAHA configurations, for sounds directly facing listeners, will apply forces that are in-phase with each other and directed roughly towards the center of the head. Below approximately 1000 Hz the two cochleae respond in approximately the same direction and with approximately the same phase to each BAHA, thus it may be preferable to drive bilateral BAHAs such that when one pushes, the other pulls. This can be achieved by adjusting the relative phase offset of the BAHAs, and doing so results in greater vibration and improved hearing threshold. In this paper we compare performance of bilateral BAHAs driven in this configuration to the standard configuration. In twelve normal participants we show significant improvements in low-frequency (≤750 Hz) hearing thresholds using out-of-phase BAHAs. The threshold measurements are further supported by velocimetric measurements taken at the cochlear promontory in a cadaveric head. Comparing vibration arising from each configuration confirms that out-of-phase driving results in greater vibration. Neither dataset shows either improved or reduced threshold at high frequencies. |
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Authors:
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Ross W Deas; Robert B A Adamson; Laura L Curran; Fawaz M Makki; Manohar Bance; Jeremy A Brown |
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Publication Detail:
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Type: Journal Article Date: 2010-09-27 |
Journal Detail:
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Title: International journal of audiology Volume: 49 ISSN: 1708-8186 ISO Abbreviation: Int J Audiol Publication Date: 2010 Dec |
Date Detail:
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Created Date: 2010-11-12 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101140017 Medline TA: Int J Audiol Country: England |
Other Details:
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Languages: eng Pagination: 933-9 Citation Subset: IM |
Affiliation:
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SENSE Laboratory, Division of Otolaryngology, Dept of Surgery, Dalhousie University, Halifax, Nova Scotia, Canada. ross.deas@dal.ca |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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