Using the contralateral routing of signals (CROS) principle, an ear-level bone-conduction hearing aid was designed for a patient with bilateral, congenital atresia. Both subjectively and objectively the performance of this instrument surpassed that of the standard body-type bone-conduction unit.
Schuchman G. An Ear-Level Hearing Aid for Bilateral Atresia. Arch Otolaryngol. 1971;94(1):87–88. doi:10.1001/archotol.1971.00770070123017
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