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Screen Shot 2015-02-18 at 1.36.48 PMA Wireless Fully-Passive Neural Recorder

Junseok Chae, Research Faculty
Connection One Research Center, School of Electrical, Computer and Energy Engineering, Arizona State University

Wednesday, February 25, 2015
Noon-1 p.m.
Goldwater Center (GWC) 487, Tempe campus [map]

Brain is full of resources; yet very little is known. Among many available techniques, monitoring neuropotentials, generated from neurons, offers understanding basic physiology and functions of the massively complex brain. The need for a reliable and safe long-term chronic implantable neural recorder is critical to lifting current barriers that limit progress in developing clinically viable treatments of the wide range of neurologically-associated disorders. A wireless fully-passive neural recorder may uplift limitations of current clinically implemented wired neural recorders as well as research-level wireless recorders in an attempt to devise a more feasible bridge between research limited technology and medically practiced solutions. The nature of wireless and fully-passive acquisition of neuropotentials allows the neural recorder virtually consumes no additional energy (no batteries, power harvesting/regulating components). The enabling key technology of wireless and fully-passive operation is electromagnetic (EM) backscattering effect. An external interrogator shines RF carrier (at 2.45 GHz) to the neural implant, which excites a passive mixer, integrated on the implant, to convert neuropotentials (up to 10 kHz) and is backscattered to the interrogator where the neuropotentials are recovered. The passive scheme eliminates the need for implanted internal power supplies or harvesting units and in effect substantially reduces heat dissipation and physical footprint. Furthermore, the stand-alone implant does not require any intra-cranial or percutaneous wiring, minimizing adverse complications related to infection, CSF leakage, and physical trauma. The wireless passive recorder may pioneer a broad range of clinical applications and advance scientific brain understanding.

In addition to the wireless passive neural recorder, the talk briefly summarizes MEMS (Micro-Electro-Mechanical-System) biosensor research activities at Arizona State University, including protein sensor array, implantable passive CSF regulator, bladder cancer sensor, and bacteria battery .
A Wireless Fully-Passive Neural Recorder
Junseok Chae received the B.S. degree in metallurgical engineering from the Korea University, Seoul, Korea, in 1998, and the M.S. and Ph.D. degrees in EECS (Electrical Engineering and Computer Science) from the University of Michigan, Ann Arbor, in 2000 and 2003, respectively. After a couple of years of being a research fellow at Michigan, he joined Arizona State University as an assistant professor in electrical engineering in 2005 and now he is an associate professor. His research areas of interest are MEMS for biomedical/bioenergy applications.
He received the 1st place prize and the best paper award in DAC (Design Automation Conference) student design contest in 2001. He has published over 100 journal and conference articles, one book, seven book chapters, and holds three US patents. He serves as a technical program committee member of IEEE MEMS conference and He received NSF (National Science Foundation) CAREER award on MEMS protein sensor array.

Pizza and drinks will be served

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