Micro-electrocorticographic (μηΟΟ) electrode arrays provide a minimally invasive, high-resolution neural interface with broad cortical coverage. Previously, we fabricated μηCoG arrays at a lower cost than commercially available devices using low-cost industrial processes , . Here, we report the in vitro electrical performance of five μηCoG designs undergoing an accelerated aging protocol. The impedance and yield of the μηCoG arrays were tracked over time. The equivalent lifetime at 37°C depended on the manufacturer and material stack-up, and ranged between 30 and greater than 760 days (ongoing). The main failure modes of these devices were delamination at the site of the electrode contact and broken traces due to metal dissolution. Based on these in vitro results, we offer several recommendations for μηCoG designs suitable for chronic implantation.
|Original language||English (US)|
|Title of host publication||2016 38th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2016|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||4|
|State||Published - Oct 13 2016|
|Event||38th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2016 - Orlando, United States|
Duration: Aug 16 2016 → Aug 20 2016
|Name||Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS|
|Other||38th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2016|
|Period||8/16/16 → 8/20/16|
Bibliographical noteFunding Information:
Research supported by Army Research Office (ARO W911NF-14-1-0173) and National Science Foundation (NSF CCF-1422914).
© 2016 IEEE.