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In this paper, two strategies are investigated for minimizing the feedback pressure (thereby increasing the maximum stable gain, MSG) of a wide-bandwidth light-activated contact hearing aid (CHA) to facilitate microphone placement in the ear canal (EC): (1) changing the location of the drive force and its direction at the umbo, and (2) placing an acoustic damper within the EC to reduce the feedback pressure at the microphone location. The MSG and equivalent pressure output (EPO) are calculated in a 3D finite element model of a human middle ear based on micro computed tomography (micro-CT) images. The model calculations indicate that changing the umbo-force direction can decrease feedback pressure, but at the expense of decreased EPO. However the model shows improvements in MSG without sacrificing EPO when an acoustic damper is placed in the EC. This was verified through benchtop experimentation and in human cadaver temporal bones. The results pave the path towards a wide-bandwidth hearing aid that incorporates an EC-microphone design.<\/jats:p>","DOI":"10.1121\/1.4976083","type":"journal-article","created":{"date-parts":[[2017,3,10]],"date-time":"2017-03-10T14:52:42Z","timestamp":1489157562000},"page":"1683-1693","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":10,"title":["Attenuating the ear canal feedback pressure of a laser-driven hearing aid"],"prefix":"10.1121","volume":"141","author":[{"given":"Morteza","family":"Khaleghi","sequence":"first","affiliation":[{"name":"Earlens Corporation , Menlo Park, California 94025, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sunil","family":"Puria","sequence":"additional","affiliation":[{"name":"Harvard Medical School Eaton-Peabody Laboratory, Massachusetts Eye and Ear Infirmary, Department of Otology and Laryngology, , 243 Charles Street, Boston, Massachusetts 02114, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"231","published-online":{"date-parts":[[2017,3,10]]},"reference":[{"issue":"2","key":"2023080804354595700_c1","doi-asserted-by":"publisher","first-page":"175","DOI":"10.1044\/1059-0889(2012\/11-0008)","article-title":"The accuracy of matching target insertion gains with open-fit hearing aids","volume":"21","year":"2012","journal-title":"Am. 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