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Shahdoost S, Frost SB, Guggenmos DJ, et al. A Brain-Spinal Interface (BSI) System-on-Chip (SoC) for Closed-Loop Cortically-Controlled Intraspinal Microstimulation. Analog Integr Circuits Signal Process. 2018;95(1):1-16doi: 10.1007/s10470-017-1093-1.
Shahdoost, S., Frost, S. B., Guggenmos, D. J., Borrell, J., Dunham, C., Barbay, S., Nudo, R. J., & Mohseni, P. (2018). A Brain-Spinal Interface (BSI) System-on-Chip (SoC) for Closed-Loop Cortically-Controlled Intraspinal Microstimulation. Analog integrated circuits and signal processing, 95(1), 1-16. https://doi.org/10.1007/s10470-017-1093-1
Shahdoost, Shahab, et al. "A Brain-Spinal Interface (BSI) System-on-Chip (SoC) for Closed-Loop Cortically-Controlled Intraspinal Microstimulation." Analog integrated circuits and signal processing vol. 95,1 (2018): 1-16. doi: https://doi.org/10.1007/s10470-017-1093-1
Shahdoost S, Frost SB, Guggenmos DJ, Borrell J, Dunham C, Barbay S, Nudo RJ, Mohseni P. A Brain-Spinal Interface (BSI) System-on-Chip (SoC) for Closed-Loop Cortically-Controlled Intraspinal Microstimulation. Analog Integr Circuits Signal Process. 2018 Apr;95(1):1-16. doi: 10.1007/s10470-017-1093-1. Epub 2018 Jan 17. PMID: 34083886; PMCID: PMC8172056.
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Analog Integr Circuits Signal Process. 2018 Apr;95(1):1-16. doi: 10.1007/s10470-017-1093-1. Epub 2018 Jan 17.

A Brain-Spinal Interface (BSI) System-on-Chip (SoC) for Closed-Loop Cortically-Controlled Intraspinal Microstimulation.

Analog integrated circuits and signal processing

Shahab Shahdoost, Shawn B Frost, David J Guggenmos, Jordan Borrell, Caleb Dunham, Scott Barbay, Randolph J Nudo, Pedram Mohseni

Affiliations

  1. Electrical Engineering and Computer Science Department, Case Western Reserve University, Cleveland, OH 44106 USA.
  2. Rehabilitation Medicine Department, University of Kansas Medical Center, Kansas City, KS 66160 USA.
  3. Bioengineering Graduate Program, University of Kansas, Lawrence, KS 66045 USA.

PMID: 34083886 PMCID: PMC8172056 DOI: 10.1007/s10470-017-1093-1

Abstract

This paper reports on a fully miniaturized brain-spinal interface (BSI) system for closed-loop cortically-controlled intraspinal microstimulation (ISMS). Fabricated in AMS 0.35μm two-poly four-metal complementary metal-oxide-semiconductor (CMOS) technology, this system-on-chip (SoC) measures ~ 3.46mm × 3.46mm and incorporates two identical 4-channel modules, each comprising a spike-recording front-end, embedded digital signal processing (DSP) unit, and programmable stimulating back-end. The DSP unit is capable of generating multichannel trigger signals for a wide array of ISMS triggering patterns based on real-time discrimination of a programmable number of intracortical neural spikes within a pre-specified time-bin duration via thresholding and user-adjustable time-amplitude windowing. The system is validated experimentally using an anesthetized rat model of a spinal cord contusion injury at the T8 level. Multichannel neural spikes are recorded from the cerebral cortex and converted in real time into electrical stimuli delivered to the lumbar spinal cord below the level of the injury, resulting in distinct patterns of hindlimb muscle activation.

Keywords: Brain-spinal interface; closed-loop neuromodulation; closed-loop neuroprosthesis; intraspinal microstimulation; neural recording; spike discrimination; spinal cord injury; system-on-chip

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