| Vacuum ear plug. | |
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MedLine Citation:
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PMID: 20331011 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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A passive inexpensive hearing protection device (HPD) will be described that provides hearing protection, which is simple to use and comfortable over hours of use. Protection from impact sounds will be provided by creating a negative pressure between the plug tip and the eardrum (-100-mm H2O or -1 kPa). The negative pressure will be created by squeezing the peripheral plug end, evacuating a fixed amount of air from the canal. The aperture diameter is 0.010 in. In effect the pump plug will have a similar acoustical action on the eardrum as a normal stapedius muscle contraction, but without its limitations (too slow and fatigue). An external flexible bladder forms the end which is held in the fingers to be inserted into the ear canal. The vacuum mechanism consists of bulb on a polypropylene frame embedded in a closed cell urethane flanged housing. With a negative pressure of -2 kPa the transmission loss is 20-25 dB. It is estimated that a negative pressure of -1 kPa would result in a transmission loss of about 15 dB. The vacuum effect is maximal in the low frequencies which will also attenuate body conducted sounds by reducing ossicular inertial. |
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Authors:
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Martin L Lenhardt |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 127 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-03-24 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 1986 Citation Subset: IM |
Affiliation:
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Dept. of Biomedical Eng., Virginia Commonwealth Univ., P.O. Box 980168 MCV, Richmond, VA 23298-0168, lenhardt@vcu.edu. |
Export Citation:
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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