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Audio-frequency characteristics of multilayer piezoelectric crystal actuator for use in hearing implants

Audio-frequency characteristics of multilayer piezoelectric crystal actuator for use in hearing implants

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  • Author(s): E.W. Abel 1 ; Z.G. Wang 1 ; R.P. Mills 2 ; Y. Liu 3
    • View affiliations
    • Affiliations: 1: APEME, Biomedical Engineering, University of Dundee, Dundee, United Kingdom
      2: Department of Otolaryngology, Royal Infirmary of Edinburgh, Edinburgh, United Kingdom
      3: Department of Electrical and Electronic Engineering, University of Portsmouth, Portsmouth, United Kingdom
  • Source: Volume 36, Issue 6, 16 March 2000, p. 494 – 495
    DOI:  10.1049/el:20000426 , Print ISSN 0013-5194, Online ISSN 1350-911X
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Published

A multilayer piezoelectric actuator has been evaluated for use in a hearing implant. Its frequency response was flat up to 20 kHz. Initial in-vitro trials gave stapes displacement from stimulation at 3.5 V RMS, which is equivalent to that from acoustic stimulation at 90 dB SPL below 1 kHz, increasing to 120 dB at 8 kHz. This performance meets accepted clinical specifications.

Inspec keywords: frequency response; hearing aids; prosthetics; piezoelectric actuators

Other keywords: 0.1 to 20 kHz; frequency response; multilayer piezoelectric crystal actuator; 90 dB; audio-frequency characteristics; 120 dB; accepted clinical specifications; hearing implant; 3.5 V; stapes displacement

Subjects: Piezoelectric devices; Prosthetics and orthotics; Prosthetics and other practical applications; Audition

References

    1. 1)
      • M.S.M.G. Vlaming , L. Feenstra . Studies on the mechanics of the normal human middle ear. Clin. Otolaryngol. , 353 - 363
    2. 2)
      • Abel, E.W., Mills, R.P., Lord, R.M.: `Methodology for laser vibrometer studies of stapes footplate displacement', Second Int. Symp. Middle-Ear Mechanics in Research and Otosurgery, October 1999, Boston, to be published.
    3. 3)
      • H. Leysieffer , J.W. Baumann , G. Muller , H.P. Zenner . An implantable piezoelectric hearing aid transducer for sensorineuralhearing loss. HNO , 792 - 815
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