Next Article in Journal
Recent Development and Perspectives of Optimization Design Methods for Piezoelectric Ultrasonic Transducers
Next Article in Special Issue
A Flexible a-SiC-Based Neural Interface Utilizing Pyrolyzed-Photoresist Film (C) Active Sites
Previous Article in Journal
Fabrication of Ultranarrow Nanochannels with Ultrasmall Nanocomponents in Glass Substrates
Previous Article in Special Issue
Implantable Optrode Array for Optogenetic Modulation and Electrical Neural Recording
 
 
Article

Manufacturable 32-Channel Cochlear Electrode Array and Preliminary Assessment of Its Feasibility for Clinical Use

by 1,†, 1,†, 1,†, 1,†, 1,†, 2,‡ and 1,*,†
1
TODOC Co., Ltd., Seoul 08394, Korea
2
Department of Otorhinolaryngology, Seoul National University Hospital, Seoul 03080, Korea
*
Author to whom correspondence should be addressed.
Current address: 1407, Hanwha Bizmetro 1, 242 Digital-ro, Guro-gu, Seoul 08394, Korea.
Current address: 101, Daehak-ro, Jongno-gu, Seoul 03080, Korea.
Academic Editor: Seong-O Choi
Micromachines 2021, 12(7), 778; https://doi.org/10.3390/mi12070778
Received: 14 May 2021 / Revised: 11 June 2021 / Accepted: 16 June 2021 / Published: 30 June 2021
(This article belongs to the Special Issue Implantable Neural Interfaces)
(1) Background: In this study, we introduce a manufacturable 32-channel cochlear electrode array. In contrast to conventional cochlear electrode arrays manufactured by manual processes that consist of electrode-wire welding, the placement of each electrode, and silicone molding over wired structures, the proposed cochlear electrode array is manufactured by semi-automated laser micro-structuring and a mass-produced layer-by-layer silicone deposition scheme similar to the semiconductor fabrication process. (2) Methods: The proposed 32-channel electrode array has 32 electrode contacts with a length of 24 mm and 0.75 mm spacing between contacts. The width of the electrode array is 0.45 mm at its apex and 0.8 mm at its base, and it has a three-layered arrangement consisting of a 32-channel electrode layer and two 16-lead wire layers. To assess its feasibility, we conducted an electrochemical evaluation, stiffness measurements, and insertion force measurements. (3) Results: The electrochemical impedance and charge storage capacity are 3.11 ± 0.89 kOhm at 1 kHz and 5.09 mC/cm2, respectively. The V/H ratio, which indicates how large the vertical stiffness is compared to the horizontal stiffness, is 1.26. The insertion force is 17.4 mN at 8 mm from the round window, and the maximum extraction force is 61.4 mN. (4) Conclusions: The results of the preliminary feasibility assessment of the proposed 32-channel cochlear electrode array are presented. After further assessments are performed, a 32-channel cochlear implant system consisting of the proposed 32-channel electrode array, 32-channel neural stimulation and recording IC, titanium-based hermetic package, and sound processor with wireless power and signal transmission coil will be completed. View Full-Text
Keywords: cochlear implant; implantable neural interface; cochlear electrode array cochlear implant; implantable neural interface; cochlear electrode array
Show Figures

Figure 1

MDPI and ACS Style

Shin, S.; Ha, Y.; Choi, G.; Hyun, J.; Kim, S.; Oh, S.-H.; Min, K.-S. Manufacturable 32-Channel Cochlear Electrode Array and Preliminary Assessment of Its Feasibility for Clinical Use. Micromachines 2021, 12, 778. https://doi.org/10.3390/mi12070778

AMA Style

Shin S, Ha Y, Choi G, Hyun J, Kim S, Oh S-H, Min K-S. Manufacturable 32-Channel Cochlear Electrode Array and Preliminary Assessment of Its Feasibility for Clinical Use. Micromachines. 2021; 12(7):778. https://doi.org/10.3390/mi12070778

Chicago/Turabian Style

Shin, Soowon, Yoonhee Ha, Gwangjin Choi, Junewoo Hyun, Sangwoo Kim, Seung-Ha Oh, and Kyou-Sik Min. 2021. "Manufacturable 32-Channel Cochlear Electrode Array and Preliminary Assessment of Its Feasibility for Clinical Use" Micromachines 12, no. 7: 778. https://doi.org/10.3390/mi12070778

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop