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Sensors and Materials, Volume 27, Number 11 (2015)
Copyright(C) MYU K.K. All Rights Reserved.

pp. 1079–1089
Published on December 9, 2015

Magnetic-Thrust Flexible Electrode with Integrated Preamplifier for Neural Recording

Toshihiko Noda*, Yoshiya Matsuzaka1, SeokBeom Kim2, Hiroaki Takehara, Kiyotaka Sasagawa, Takashi Tokuda, Hajime Mushiake1, Hiroshi Onodera3 and Jun Ohta

Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
1Tohoku University, 2-1 Seiryo-machi Aoba-ku, Sendai 980-8575, Japan
2Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
3The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8654, Japan

(Received June 30, 2015; accepted August 10, 2015)

Key words: neural recording, flexible electrode, magnetic thrust, integrated preamplifier

Flexible electrodes for use in recording neural activity were fabricated in this study, and their use was demonstrated. By using the mechanical force generated by a magnetic field, an electrode can be inserted into a tissue, and the position of the electrode can be controlled. The position and insertion path of the electrode can be controlled accurately with a high degree of freedom. No stiffener materials are required for the insertion process. A headstage amplifier, which is indispensable for low-noise recording, was hybrid-integrated with a flexible electrode. A miniaturized main amplifier that served as a second-stage amplifier was also fabricated. The magnetic controllability of the fabricated electrode was demonstrated using a phantom of a tissue. An in vivo experiment was also performed for the functional validation of the recording function. Local field potentials were recorded successfully as a result of the experiment.

*Corresponding author: Toshihiko Noda


Copyright(C) MYU K.K. All Rights Reserved.