Development of piezoelectric acoustic sensor with frequency selectivity for artificial cochlea

Shintaku, Hirofumi; Nakagawa, Takayuki; Kitagawa, Dai; Tanujaya, Harto; Kawano, Seiji; Ito, Juichi

doi:10.1016/j.sna.2009.12.021

Cited by 113 publications

(136 citation statements)

References 15 publications

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“…The prototype piezoelectric device was fabricated as previously described (18). A thin aluminum film was formed on both sides of the 40-μm-thick PVDF membrane by sputtering.…”

Section: Methodsmentioning

confidence: 99%

“…2A) containing a PVDF membrane (40-μm thickness) was fabricated using microelectromechanical systems as described previously (18). The piezoelectric membrane was used as a transducer, and its electrical outputs were amplified by 1,000-fold.…”

Section: Generation Of Abrs By a Piezoelectric Device In Living Guinementioning

confidence: 99%

“…To test this hypothesis, we developed a prototype artificial cochlear epithelium using a piezoelectric membrane, which functions as a sensor with the capability for acoustic/electric conversion without a battery (18). The piezoelectric device, although not lifesized, showed a tonotopic map for frequencies of 6.6-19.8 kHz in air and 1.4-4.9 kHz in silicone oil, and it generated maximum electrical output from an electrode placed at the site of maximum vibration.…”

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confidence: 99%

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Piezoelectric materials mimic the function of the cochlear sensory epithelium

Inaoka

Shintaku²,

Nakagawa³

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

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Cochlear hair cells convert sound vibration into electrical potential, and loss of these cells diminishes auditory function. In response to mechanical stimuli, piezoelectric materials generate electricity, suggesting that they could be used in place of hair cells to create an artificial cochlear epithelium. Here, we report that a piezoelectric membrane generated electrical potentials in response to sound stimuli that were able to induce auditory brainstem responses in deafened guinea pigs, indicating its capacity to mimic basilar membrane function. In addition, sound stimuli were transmitted through the external auditory canal to a piezoelectric membrane implanted in the cochlea, inducing it to vibrate. The application of sound to the middle ear ossicle induced voltage output from the implanted piezoelectric membrane. These findings establish the fundamental principles for the development of hearing devices using piezoelectric materials, although there are many problems to be overcome before practical application.cochlear implant | hearing loss | mechanoelectrical transduction | traveling wave | regeneration T he cochlea is responsible for auditory signal transduction in the auditory system. It responds to sound-induced vibrations and converts these mechanical signals into electrical impulses, which stimulate the auditory primary neurons. The human cochlea operates over a three-decade frequency band from 20 Hz to 20 kHz, covers a 120-dB dynamic range, and can distinguish tones that differ by <0.5% in frequency (1). It is relatively small, occupying a volume of <1 cm 3 , and it requires ∼14 μW power to function (2). The mammalian ear is composed of three parts: the outer, middle, and inner ears (Fig. 1A) (3). The outer ear collects sound and funnels it through the external auditory canal to the tympanic membrane. The cochlea consists of three compartments: scala vestibuli and scala tympani, which are filled with perilymph fluid, and scala media, which is filled with endolymph fluid (Fig. 1C). The scala vestibuli and scala tympani form a continuous duct that opens onto the middle ear through the oval and round windows. The stapes, an ossicle in the middle ear, is directly coupled to the oval window. Sound vibration is transmitted from the ossicles to the cochlear fluids through the oval window as a pressure wave that travels from the base to the apex of the scala vestibuli through the scala tympani and finally to the round window (Fig. 1B). The scala media are membranous ducts that are separated from the scala vestibuli by Reissner's membrane and separated from the scala tympani by the basilar membrane. The pressure wave propagated by the vibration of the stapes footplate causes oscillatory motion of the basilar membrane, where the organ of Corti is located. The organ of Corti contains the sensory cells of the auditory system; they are known as hair cells, because tufts of stereocilia protrude from their apical surfaces (Fig. 1D). The oscillatory motion of the basilar membrane results in the shear motion of the st...

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“…The prototype piezoelectric device was fabricated as previously described (18). A thin aluminum film was formed on both sides of the 40-μm-thick PVDF membrane by sputtering.…”

Section: Methodsmentioning

confidence: 99%

Section: Generation Of Abrs By a Piezoelectric Device In Living Guinementioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Piezoelectric materials mimic the function of the cochlear sensory epithelium

Inaoka

Shintaku²,

Nakagawa³

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

121

127

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“…Tanaka et al [3] and Xu et al [4] developed acoustic sensors with the function of frequency selectivity by the use of resonance of cantilever arrays. Ito et al [5] developed a PVDF piezoelectric artificial cochlea which worked as a sensor with the acoustic/electric conversion and with the frequency selectivity based on MEMS technology. In this paper, we studied the feasibility of single crystal PMN-PT piezoelectric cantilever array as an alternative for basilar membrane and mechanosensitive ion channel of cochlea.…”

Section: Introductionmentioning

confidence: 99%

Biomimetic acoustic sensor based on piezoelectric cantilever array

Hur

Kwak

Jung

et al. 2012

IEICE Electron. Express

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Abstract:In this research, a biomimetic acoustic sensor that can mimic the functional properties of basilar membrane in mammalian cochlea was fabricated with PMN-PT piezoelectric cantilever array. The piezoelectric cantilever array with ten different lengths was designed to obtain different resonant frequencies. It was fabricated by semiconductor processes and was poled to generate an electrical signal from an audible sound source. The fabricated acoustic sensor was tested by experimental setup. As an experimental result, the resonant frequencies of each cantilever and corresponding electrical signals were measured from 490 Hz to 13,600 Hz and the displacement sensitivity was measured with the audible frequency range.

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“…近年来, 人们已经在可穿戴可植入传感器领域取得了显著进步, 例如利用电子皮肤向大脑传递皮肤触觉信息 [2] , 利用三维微电极实现大脑皮层控制假肢 [3] , 利用人工耳蜗恢复病人听力等 [4] . 然而, 实现柔性可穿戴电子传感器的高分辨、高灵敏、快速响应、低成本制造和复杂信号检测仍然是一个很大的挑战 [5] .…”

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