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SUMMARY:Piezoelectric microelectromechanical devices for biomedical applic
 ations
DTSTART:20170912T130000
DTSTAMP:20260510T135058Z
UID:66cefdc6948ce0d6301c0df7eea2225708070c901124bbd6c4e19380
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Hongsoo Choi\, Microrobot Research Center\, Daegu Gyeon
 gbuk Institute of Science and Technology (DGIST)\, South Korea\nArtificial
  basilar membrane and piezoelectric micromachined ultrasonic transducer \n
 \nCochlear implants (CIs) are currently the most common solution for senso
 rineural hearing loss caused by damage to hair cells in the cochlea. Howev
 er\, the extracorporeal units of CIs cause discomfort in daily life\, and 
 there is a social stigma associated with hearing impairment. Device prices
  and frequent charging are also limitations of CIs. In this presentation\,
  I will discuss biomimetic artificial basilar membranes (ABMs). ABMs are a
 coustic sensors for next-generation CIs that mimic the passive frequency s
 electivity and acoustic-to-electric energy conversion of the cochlea. An A
 BM is composed of a multi-channel beam array to mechanically separate inpu
 t sound frequency. Piezoelectric and triboelectric effects initiate the ac
 oustic-to-electric energy conversion.\n\nIn our research\, ABMs were integ
 rated with a signal processor and used to measure auditory-evoked potentia
 l from deafened guinea pigs. Second\, I will briefly introduce a piezoelec
 tric micromachined ultrasonic transducer (pMUT) using microelectromechanic
 al system (MEMS) technologies as a next-generation ultrasonic transducer. 
 Here\, we developed a novel cell-stimulation system using two-dimensional 
 (2D) pMUT arrays for targeted ultrasonic cell stimulation\; our device sho
 wed increased cell proliferation rates.\n\nAdditionally\, we will examine 
 2D array pMUTs and segmented annular array pMUTs as they relate to low-int
 ensity ultrasonic stimulation. I will also discuss optimization of our pMU
 T by incorporation of a thick PZT film via granule spraying in vacuum (GSV
 ). Fabrication using the GSV process was both simple and fast. The deflect
 ion of the GSV-fabricated PZT pMUT was larger than that for a sol-gel PZT 
 pMUT.\n\nBio: Hongsoo Choi\, Ph.D.\, is an Associate Professor at the Depa
 rtment of Robotics Engineering and Co-Director of the DGIST-ETH Microrobot
  Research Center at DGIST. He received his M.S (2003) and Ph.D. (2007) deg
 rees from the School of Mechanical and Materials Engineering at Washington
  State University. He received several awards from many conferences includ
 ing Rising Star Award (2014) from the International Society of 3M-NANO and
  Best Poster Award (2015) from The Korean Society of Medical & Biological 
 Engineering.\n\nHis research areas are biomedical microrobots for targeted
  therapeutics\, MEMS-based devices for biomedical applications\, especiall
 y\, piezoelectric devices such as piezoelectric micromachined ultrasound t
 ransducer (pMUT) and artificial cochlea using piezoelectric sensors.\n 
LOCATION:BM 5202 https://plan.epfl.ch/?room==BM%205202
STATUS:CONFIRMED
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