Intracochlear pressure measurements during acoustic shock wave exposure

Hearing Research
Nathaniel T GreeneDaniel J Tollin

Abstract

Injuries to the peripheral auditory system are among the most common results of high intensity impulsive acoustic exposure. Prior studies of high intensity sound transmission by the ossicular chain have relied upon measurements in animal models, measurements at more moderate sound levels (i.e. < 130 dB SPL), and/or measured responses to steady-state noise. Here, we directly measure intracochlear pressure in human cadaveric temporal bones, with fiber optic pressure sensors placed in scala vestibuli (SV) and tympani (ST), during exposure to shock waves with peak positive pressures between ∼7 and 83 kPa. Eight full-cephalic human cadaver heads were exposed, face-on, to acoustic shock waves in a 45 cm diameter shock tube. Specimens were exposed to impulses with nominal peak overpressures of 7, 28, 55, & 83 kPa (171, 183, 189, & 192 dB pSPL), measured in the free field adjacent to the forehead. Specimens were prepared bilaterally by mastoidectomy and extended facial recess to expose the ossicular chain. Ear canal (EAC), middle ear, and intracochlear sound pressure levels were measured with fiber-optic pressure sensors. Surface-mounted sensors measured SPL and skull strain near the opening of each EAC and at the forehead. Measurement...Continue Reading

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Citations

Sep 15, 2020·Annals of Biomedical Engineering·Marcus A BrownRong Z Gan
Dec 5, 2019·The Journal of the Acoustical Society of America·Charles JokelMartin B Robinette
Dec 5, 2019·The Journal of the Acoustical Society of America·John J RosowskiJeffrey Tao Cheng
Aug 19, 2020·Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology·Zahra JafariMajid H Mohajerani
Feb 2, 2021·Hearing Research·Shangyuan JiangRong Z Gan
Apr 20, 2021·Hearing Research·Jeffrey Tao ChengJohn Rosowski
Jul 29, 2021·Journal of Biomechanical Engineering·Marcus A BrownRong Z Gan

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