한빛사 논문
Byeonghak Park1, Joo Hwan Shin1, Jehyung Ok1, Subin Park1, Woojin Jung1, Chanho Jeong2, Seunghwan Choy1, Young Jin Jo1, Tae-il Kim1,2,3*
1School of Chemical Engineering, Sungkyunkwan University(SKKU), Suwon 16419, Republic of Korea. 2Department of Biomedical Engineering, SKKU, Suwon 16419, Republic of Korea. 3Biomedical Institute for Convergence at SKKU(BICS), SKKU, Suwon 16419, Republic of Korea.
*Corresponding author.
Abstract
Bioelectronics needs to continuously monitor mechanical and electrophysiological signals for patients. However, the signals always include artifacts by patients’ unexpected movement (such as walking and respiration under approximately 30 hertz). The current method to remove them is a signal process that uses a bandpass filter, which may cause signal loss. We present an unconventional bandpass filter material—viscoelastic gelatin-chitosan hydrogel damper, inspired by the viscoelastic cuticular pad in a spider—to remove dynamic mechanical noise artifacts selectively. The hydrogel exhibits frequency-dependent phase transition that results in a rubbery state that damps low-frequency noise and a glassy state that transmits the desired high-frequency signals. It serves as an adaptable passfilter that enables the acquisition of high-quality signals from patients while minimizing signal process for advanced bioelectronics.
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