Piezoelectric microelectromechanical devices for biomedical applications
Event details
| Date | 12.09.2017 |
| Hour | 13:00 |
| Speaker | Prof. Hongsoo Choi, Microrobot Research Center, Daegu Gyeongbuk Institute of Science and Technology (DGIST), South Korea |
| Location | |
| Category | Conferences - Seminars |
Artificial basilar membrane and piezoelectric micromachined ultrasonic transducer
Cochlear implants (CIs) are currently the most common solution for sensorineural hearing loss caused by damage to hair cells in the cochlea. However, 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 acoustic sensors for next-generation CIs that mimic the passive frequency selectivity and acoustic-to-electric energy conversion of the cochlea. An ABM is composed of a multi-channel beam array to mechanically separate input sound frequency. Piezoelectric and triboelectric effects initiate the acoustic-to-electric energy conversion.
In our research, ABMs were integrated with a signal processor and used to measure auditory-evoked potential from deafened guinea pigs. Second, I will briefly introduce a piezoelectric micromachined ultrasonic transducer (pMUT) using microelectromechanical 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 showed increased cell proliferation rates.
Additionally, we will examine 2D array pMUTs and segmented annular array pMUTs as they relate to low-intensity ultrasonic stimulation. I will also discuss optimization of our pMUT by incorporation of a thick PZT film via granule spraying in vacuum (GSV). Fabrication using the GSV process was both simple and fast. The deflection of the GSV-fabricated PZT pMUT was larger than that for a sol-gel PZT pMUT.
Bio: Hongsoo Choi, Ph.D., is an Associate Professor at the Department 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) degrees from the School of Mechanical and Materials Engineering at Washington State University. He received several awards from many conferences including Rising Star Award (2014) from the International Society of 3M-NANO and Best Poster Award (2015) from The Korean Society of Medical & Biological Engineering.
His research areas are biomedical microrobots for targeted therapeutics, MEMS-based devices for biomedical applications, especially, piezoelectric devices such as piezoelectric micromachined ultrasound transducer (pMUT) and artificial cochlea using piezoelectric sensors.
Cochlear implants (CIs) are currently the most common solution for sensorineural hearing loss caused by damage to hair cells in the cochlea. However, 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 acoustic sensors for next-generation CIs that mimic the passive frequency selectivity and acoustic-to-electric energy conversion of the cochlea. An ABM is composed of a multi-channel beam array to mechanically separate input sound frequency. Piezoelectric and triboelectric effects initiate the acoustic-to-electric energy conversion.
In our research, ABMs were integrated with a signal processor and used to measure auditory-evoked potential from deafened guinea pigs. Second, I will briefly introduce a piezoelectric micromachined ultrasonic transducer (pMUT) using microelectromechanical 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 showed increased cell proliferation rates.
Additionally, we will examine 2D array pMUTs and segmented annular array pMUTs as they relate to low-intensity ultrasonic stimulation. I will also discuss optimization of our pMUT by incorporation of a thick PZT film via granule spraying in vacuum (GSV). Fabrication using the GSV process was both simple and fast. The deflection of the GSV-fabricated PZT pMUT was larger than that for a sol-gel PZT pMUT.
Bio: Hongsoo Choi, Ph.D., is an Associate Professor at the Department 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) degrees from the School of Mechanical and Materials Engineering at Washington State University. He received several awards from many conferences including Rising Star Award (2014) from the International Society of 3M-NANO and Best Poster Award (2015) from The Korean Society of Medical & Biological Engineering.
His research areas are biomedical microrobots for targeted therapeutics, MEMS-based devices for biomedical applications, especially, piezoelectric devices such as piezoelectric micromachined ultrasound transducer (pMUT) and artificial cochlea using piezoelectric sensors.
Practical information
- General public
- Free
Organizer
- EPFL / STI / IMT Prof. Juergen Brugger
Contact
- Schafer Isabelle <[email protected]>