Flexible, high-resolution thin-film electrodes for human and animal neural research

Chia Han Chiang, Charles Wang, Katrina Barth, Shervin Rahimpour, Michael Trumpis, Suseendrakumar Duraivel, Iakov Rachinskiy, Agrita Dubey, Katie E. Wingel, Megan Wong, Nicholas S. Witham, Thomas Odell, Virginia Woods, Brinnae Bent, Werner Doyle, Daniel Friedman, Eckardt Bihler, Christopher F. Reiche, Derek G. Southwell, Michael M. HaglundAllan H. Friedman, Shivanand P. Lad, Sasha Devore, Orrin Devinsky, Florian Solzbacher, Bijan Pesaran, Gregory Cogan, Jonathan Viventi

Research output: Contribution to journalArticlepeer-review

Abstract

Objective. Brain functions such as perception, motor control, learning, and memory arise from the coordinated activity of neuronal assemblies distributed across multiple brain regions. While major progress has been made in understanding the function of individual neurons, circuit interactions remain poorly understood. A fundamental obstacle to deciphering circuit interactions is the limited availability of research tools to observe and manipulate the activity of large, distributed neuronal populations in humans. Here we describe the development, validation, and dissemination of flexible, high-resolution, thin-film (TF) electrodes for recording neural activity in animals and humans. Approach. We leveraged standard flexible printed-circuit manufacturing processes to build high-resolution TF electrode arrays. We used biocompatible materials to form the substrate (liquid crystal polymer; LCP), metals (Au, PtIr, and Pd), molding (medical-grade silicone), and 3D-printed housing (nylon). We designed a custom, miniaturized, digitizing headstage to reduce the number of cables required to connect to the acquisition system and reduce the distance between the electrodes and the amplifiers. A custom mechanical system enabled the electrodes and headstages to be pre-assembled prior to sterilization, minimizing the setup time required in the operating room. PtIr electrode coatings lowered impedance and enabled stimulation. High-volume, commercial manufacturing enables cost-effective production of LCP-TF electrodes in large quantities. Main Results. Our LCP-TF arrays achieve 25× higher electrode density, 20× higher channel count, and 11× reduced stiffness than conventional clinical electrodes. We validated our LCP-TF electrodes in multiple human intraoperative recording sessions and have disseminated this technology to >10 research groups. Using these arrays, we have observed high-frequency neural activity with sub-millimeter resolution. Significance. Our LCP-TF electrodes will advance human neuroscience research and improve clinical care by enabling broad access to transformative, high-resolution electrode arrays.

Original languageEnglish (US)
Article number045009
JournalJournal of neural engineering
Volume18
Issue number4
DOIs
StatePublished - Aug 2021

Keywords

  • Brain Machine Interface (BMI)
  • ECoG
  • electrode
  • iEEG
  • Intraoperative
  • LCP
  • Neural Interface

ASJC Scopus subject areas

  • Biomedical Engineering
  • Cellular and Molecular Neuroscience

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