Anatomical Vibrations That Implantable Microphones Must Overcome

Jenkins, Herman A.; Pergola, Nicholas; Kasic, James

doi:10.1097/01.mao.0000271700.52982.d8

Cited by 22 publications

(10 citation statements)

References 5 publications

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“…The conventional methods did not consider the biomechanical problems associated with mastication movement. Jenkins et al [12] and Woo et al [13] studied mastication noise at FIHDs with a microphone. However, because mastication noise is generated as vibrations from the jawbone, the microphone is not suitable because of problems related to biocompatibility.…”

Section: Resultsmentioning

confidence: 99%

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Mastication noise reduction method for fully implantable hearing aid using piezo-electric sensor

Lee

Wei

et al. 2017

THC

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Abstract. BACKGROUND: Fully implantable hearing devices (FIHDs) can be affected by generated biomechanical noise such as mastication noise. OBJECTIVE: To reduce the mastication noise using a piezo-electric sensor, the mastication noise is measured with the piezoelectric sensor, and noise reduction is practiced by the energy difference. METHODS: For the experiment on mastication noise, a skull model was designed using artificial skull model and a piezoelectric sensor that can measure the vibration signals better than other sensors. A 1 kHz pure-tone sound through a standard speaker was applied to the model while the lower jawbone of the model was moved in a masticatory fashion. RESULTS: The correlation coefficients and signal-to-noise ratio (SNR) before and after application of the proposed method were compared. It was found that the signal-to-noise ratio and correlation coefficients increased by 4.48 dB and 0.45, respectively. CONCLUSION: The mastication noise is measured by piezo-electric sensor as the mastication noise that occurred during vibration. In addition, the noise was reduced by using the proposed method in conjunction with MATLAB. In order to confirm the performance of the proposed method, the correlation coefficients and signal-to-noise ratio before and after signal processing were calculated. In the future, an implantable microphone for real-time processing will be developed.

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Section: Resultsmentioning

confidence: 99%

“…The signals can be distorted, although the vibrations caused by patient mastication are relatively small. Jenkins et al [12] studied the skin vibration of the temporal bone, which is the anatomical vibration generated by mastication. However, they did not consider the anatomical vibration effect for an implanted microphone.…”

Section: Introductionmentioning

confidence: 99%

Mastication noise reduction method for fully implantable hearing aid using piezo-electric sensor

Lee

Wei

et al. 2017

THC

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“…The generated noise signal by masticatory movement will be lower the performance of FIHDs. The Jenkins [10] was investigated skin vibration of near the temporal bone about the generated anatomical vibration by masticatory movement. In this paper, the 2-channel implantable microphone was fabricated for generated noise reduction by masticatory movement.…”

Section: Introductionmentioning

confidence: 99%

The method of masticatory movement noise reduction using the dual channel implantable microphone

Cho

Woo

Kim³

et al. 2012

IET International Conference on Information Science and Control Engineering 2012 (ICISCE 2012)

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The input part of fully implantable hearing devices (FIHDs) was using the implantable microphone that was implanted under the skin of the temporal bone. So, implantable microphone`s characteristics can be affected by the masticatory movement and moving artifacts. In this paper, the 2-channel implantable microphone was designed for masticatory movement noise reduction. For in vivo experiment, the fabricated microphone was implanted in the rabbit. And then, the 1 kHz pure-tone sound by a speaker was applied to the rabbit, and the feeds were given simultaneously to the rabbit. The measured signal was processed using the adaptive filter with least mean square (LMS) algorithm for noise reduction. To confirm performance of proposed method, the correlation coefficient and signal to noise ratio (SNR) before and after the signal processing were calculated.

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“…One significant challenge must occur in the development of a high-performance implantable microphone, which must detect desired acoustic signals in the presence of undesired signals [4]. Unfortunately, no affordable TICI or TIHA system is commercially available except only one brand of TIHA (the Esteem ® system) [5], but limited to its expensive price to date.…”

Section: Introductionmentioning

confidence: 99%

Feasible pickup from intact ossicular chain with floating piezoelectric microphone

Kang

Gao

Chi³

et al. 2012

BioMedical Engineering OnLine

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ObjectivesMany microphones have been developed to meet with the implantable requirement of totally implantable cochlear implant (TICI). However, a biocompatible one without destroying the intactness of the ossicular chain still remains under investigation. Such an implantable floating piezoelectric microphone (FPM) has been manufactured and shows an efficient electroacoustic performance in vitro test at our lab. We examined whether it pick up sensitively from the intact ossicular chain and postulated whether it be an optimal implantable one.MethodsAnimal controlled experiment: five adult cats (eight ears) were sacrificed as the model to test the electroacoustic performance of the FPM. Three groups were studied: (1) the experiment group (on malleus): the FPM glued onto the handle of the malleus of the intact ossicular chains; (2) negative control group (in vivo): the FPM only hung into the tympanic cavity; (3) positive control group (Hy-M30): a HiFi commercial microphone placed close to the site of the experiment ear. The testing speaker played pure tones orderly ranged from 0.25 to 8.0 kHz. The FPM inside the ear and the HiFi microphone simultaneously picked up acoustic vibration which recorded as .wav files to analyze.ResultsThe FPM transformed acoustic vibration sensitively and flatly as did the in vitro test across the frequencies above 2.0 kHz, whereas inefficiently below 1.0 kHz for its overloading mass. Although the HiFi microphone presented more efficiently than the FPM did, there was no significant difference at 3.0 kHz and 8.0 kHz.ConclusionsIt is feasible to develop such an implantable FPM for future TICIs and TIHAs system on condition that the improvement of Micro Electromechanical System and piezoelectric ceramic material technology would be applied to reduce its weight and minimize its size.

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Anatomical Vibrations That Implantable Microphones Must Overcome

Cited by 22 publications

References 5 publications

Mastication noise reduction method for fully implantable hearing aid using piezo-electric sensor

Mastication noise reduction method for fully implantable hearing aid using piezo-electric sensor

The method of masticatory movement noise reduction using the dual channel implantable microphone

Feasible pickup from intact ossicular chain with floating piezoelectric microphone

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