title: Middle ear implantable hearing device: ongoing animal and human evaluation.
abstract: The first five patients have been permanently implanted with an electromagnetic middle ear implantable hearing device. Hearing tests were performed at the time of operation and at 8 weeks postoperatively with a coil held at the isthmus of the ear canal. All patients reported clear, high fidelity sound, as proven by speech discrimination scores. Improvements were seen in all frequencies, including 4,000 Hz. Improvement in pure tones as tested with an audiometer monitoring sounds amplified by a 3-V sound processor was as high as 50 dB sound pressure level. That which remains to be done is the final design of a compact, wearable sound processor with filtering and signal-processing capabilities to meet the needs of the sensorineural hearing-impaired population.
authors.affiliation: Central Ear Research Institute, Oklahoma City.
authors.forename: J
authors.initials: J
authors.lastname: Hough
authors.forename: K J
authors.initials: KJ
authors.lastname: Dormer
authors.forename: R S
authors.initials: RS
authors.lastname: Baker
authors.forename: M
authors.initials: M
authors.lastname: Meikle
authors.forename: T
authors.initials: T
authors.lastname: Himelick
mesh_terms: D000818:Animals; D001672:Biocompatible Materials; D003054:Cochlear Implants; D003638:Deafness / Q000601:surgery*; D004285:Dogs; D004432:Ear, Middle / Q000601:surgery*; D055590:Electromagnetic Phenomena; D005260:Female; D006041:Goats; D006168:Guinea Pigs; D006320:Hearing Tests; D006801:Humans; D008297:Male; D008422:Materials Testing; D008875:Middle Aged; D011379:Prognosis; D011474:Prosthesis Design; D012449:Safety
chemical_list: D001672:Biocompatible Materials