Spirally Arrayed Electrode for Spatially Selective and Minimally Displacive Peripheral Nerve Interface

Ockchul Kim, Wonsuk Choi, Woohyun Jung, Sunyoung Jung, Hyung Dal Park, Jinwoo Jeong, Jun Uk Chu, Jong Woong Park, Jinseok Kim

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The peripheral neural interface (PNI) is a vital technology in robotic prosthesis due to its potential to provide bidirectional communication between the prosthesis and the brain. However, a more efficient trade-off between neural spatial selectivity and invasiveness is still needed. We propose a 32-channel spirally arrayed electrode (SPAE) that achieves high spatial selectivity for the axons in the nerve while minimizing the potential nerve damage. SPAE has an array of probes with multiple electrodes per probe, which reduces the amount of nerve tissue damaged per electrode. This array is spirally inserted into the peripheral nerve, which enables even electrtode distribution and may prevent the constriction of the nerve. The SPAE has an average electrode impedance of 296 kΩ with a standard deviation of 52 kΩ at 1000 Hz. The SPAE was acutely implanted into the rat sciatic nerve and was able to obtain spontaneous neural signals. The proposed SPAE design could lead to a PNI platform with low invasiveness while achieving high spatial selectivity with the nerve. We believe, with further experimentations and design optimizations, the SPAE could be a promising and beneficial platform to further the study into the peripheral nervous system and the development of robotic prosthesis and its control. [2020-0037]

Original languageEnglish
Article number9108407
Pages (from-to)514-521
Number of pages8
JournalJournal of Microelectromechanical Systems
Issue number4
Publication statusPublished - 2020 Aug

Bibliographical note

Funding Information:
Manuscript received March 9, 2020; revised May 7, 2020; accepted May 11, 2020. Date of publication June 4, 2020; date of current version July 31, 2020. This research was supported by the convergence technology development program for bionic arm through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT. (No. 2017M3C1B2085292). Subject Editor E. Meng. (Corresponding authors: Jong-Wong Park; Jinseok Kim.) Ockchul Kim was with the Center for Bionics, Korea Institute of Science and Technology, Seoul 02792, South Korea.

Publisher Copyright:
© 1992-2012 IEEE.


  • Brain-computer interfaces
  • electrode array
  • flexible polymer
  • neural interface

ASJC Scopus subject areas

  • Mechanical Engineering
  • Electrical and Electronic Engineering


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