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Detailed Program
Paper Number : PI-I03
Time Frame : 13:30~13:50
Presentation Date : Thurseday, 27, November
Session Name : Piezoelectric Materials, Devices & Applocations
Session Chair 1# : Miso Kim
Session Chair 2# : Takeshi Morita
Piezoelectric MEMS devices for artificial cochlea and ultrasonic cell stimulation
Hongshoo Choi
Daegu Gyeongbuk Institute of Science and Technology
Piezoelectric thin-film based micro-electro mechanical systems (MEMS) devices have been used for a variety of applications including resonators, ultrasound transducers, micro actuators, micromirror, energy harvesting devices, pressure sensors, and accelerometers. In this presentation, two biomedical applications of the piezoelectric MEMS will be discussed including artificial basilar membrane for a totally implantable artificial cochlea and piezoelectric micromachined ultrasonic transducer (pMUT) for ultrasonic cell stimulation. A prototype of artificial cochlea including artificial basilar membrane array, signal processor with amplifier, pulse width modulator, and intra-cochlear electrode array was used for electrically evoked auditory brainstem response testing. These acoustic sensors have potential for use in next-generation human cochlear implants. A new ultrasonic cell stimulation system was fabricated using two different pMUT arrays with the size of 2.5 by 2.5 mm and 2.27 by 6.84 mm for 10 by 10 and 10 by 29 pMUT arrays, respectively. The measured acoustic intensities were 0.22 MPa and 0.18 MPa for 10 by 10 and 10 by 29 arrays, respectively, at the resonance frequency of 1.494 MHz for both arrays. The proposed system was used to stimulate PC-12 cells to enhance proliferation and differentiation. This system can be used to find the optimized ultrasonic stimulation condition for difference types of cell.
Acknowledgements : This work was supported by the DGIST MIREBraiN Project and DGIST R&D Program of the Ministry of Science, ICT and Technology of Korea (14-BD-0403).