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A brain-spinal interface (BSI) system-on-chip (SoC) for closed-loop cortically-controlled intraspinal microstimulation
Shahdoost, Shahab Frost, Shawn B. Guggenmos, David J. Borrell, Jordan Dunham, Caleb Barbay, Scott Nudo, Randolph J. Mohseni, Pedram
Shahdoost, Shahab
Frost, Shawn B.
Guggenmos, David J.
Borrell, Jordan
Dunham, Caleb
Barbay, Scott
Nudo, Randolph J.
Mohseni, Pedram
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Abstract
This paper reports on a fully miniaturized brain-spinal interface system for closed-loop cortically-controlled intraspinal microstimulation (ISMS). Fabricated in AMS 0.35 µm two-poly four-metal complementary metal–oxide–semiconductor technology, this system-on-chip measures ~ 3.46 mm × 3.46 mm 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.
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Date
2018-01-17
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Springer
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Keywords
Brain-spinal interface, Closed-loop neuromodulation, Closed-loop neuroprosthesis, Intraspinal microstimulation, Neural recording, Spike discrimination, Spinal cord injury, System-on-chip
Citation
Shahdoost, S., Frost, S.B., Guggenmos, D.J. et al. A brain-spinal interface (BSI) system-on-chip (SoC) for closed-loop cortically-controlled intraspinal microstimulation. Analog Integr Circ Sig Process 95, 1–16 (2018). https://doi.org/10.1007/s10470-017-1093-1