title: Initial experiments to develop a MEMS transducer for a new implantable audioprosthesis to substitute the tympanic-ossicular system.
abstract: CONCLUSIONS
  We tested one prototype of a new audioprosthesis including the audioprocessor, the implemented algorithms and fitting platform in a small group of selected patients with mixed hypoacusis due to earlier bilateral radical mastoidectomy. It was effective to compensate the conductive and the neurosensory components of those patients. Results regarding the energy, frequency and other requirements of the output transduction make it possible to develop a suitable actuator with the available Micro-Electromechanic-Machine-System (MEMS) technology to substitute the conventional transducer of the prototype.
  
  
  OBJECTIVE
  The objectives were: a) to evaluate the effectiveness of the whole fitting system, and b) to obtain information about the required energy to design the MEMS actuator.
  
  
  METHODS
  The experiments were conducted with the A prototype of the prosthesis equipped with an output transducer coupled to the oval window. Two algorithms and three cases were tested.
  
  
  RESULTS
  The audioprocessor with the implemented FIR filter-67 coefficients paradigm algorithms, and the fitting system were shown to be adequate for clinical use. Effectiveness parameters were: pure tone average gains 20-33.3 dB; gap closure 25.5-31.8 dB; speech reception thresholds improvement 15-20 dB. Required gain: 5-40 dB. Subjectively, patients considered the results very satisfactory.
authors: Department of Otolaryngology, University of Málaga, Málaga, Spain. rurquiza@uma.es
authors: Rafael Urquiza
authors: RU
authors: de la Rosa
authors: Javier Lopez
authors: JL
authors: Garcia
authors: Jose Antonio Sanchez
authors: JA
authors: Duran
authors: Alfonso Gago
authors: AG
authors: Bohorquez
authors: Minguel Ciges
authors: MC
authors: Juan
mesh_terms: D000465:Algorithms; D001301:Audiometry, Pure-Tone; D002908:Chronic Disease; D004429:Ear Ossicles; D004432:Ear, Middle; D004599:Electric Stimulation Therapy; D006310:Hearing Aids; D034381:Hearing Loss / Q000534:rehabilitation*; D006314:Hearing Loss, Conductive / Q000534:rehabilitation; D006801:Humans; D008417:Mastoiditis / Q000601:surgery; D010033:Otitis Media / Q000150:complications; D010046:Oval Window, Ear; D011183:Postoperative Complications / Q000534:rehabilitation; D011474:Prosthesis Design; D019919:Prosthesis Implantation; D012984:Software; D013069:Speech Reception Threshold Test; D014159:Transducers