Journal
MECHATRONICS
Volume 19, Issue 6, Pages 965-971Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mechatronics.2009.07.001
Keywords
Piezoelectric floating mass transducer; Implantable middle ear hearing device
Categories
Funding
- Ministry of Health & Welfare, Republic of Korea [A020610]
- Brain Korea 21 Project
- Korea Health Promotion Institute [A020610] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this paper, a piezoelectric floating mass transducer (PFMT) which consists of a multi-layered piezoelectric actuator and a metal case has been evaluated for its suitability as a transducer in implantable middle ear hearing device (IMEHD) for mild-to-severe sensorineural hearing loss. Like the VIBRANT ME-DEL's FMT (R), the PFMT can be attached to the incus long process with a metal clamp and vibrate the ossicular chain according to the force originated from the piezoelectric actuator's expansion-and-contraction. An in vitro experiment using a human temporal bone confirms that the PFMT excitation at 3.5V(rms) can generate vibration displacements being equivalent to the sound pressure of about 94 dB SPL below I kHz and about 140 dB SPL at 8 kHz. The PFMT's power consumption to produce 94 dB SPL equivalent sound stimulation is 65 mu W at 1 kHz. Therefore, the PFMT is expected to be a useful transducer with advantages such as simple surgical implantation, no interference from external electromagnetic fields, and an improved productivity. (C) 2009 Published by Elsevier Ltd.
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