Thurgood, B. K.; Ledbetter, N. M.; Warren, D. J.; Clark, G. A.
Wireless integrated circuit for 100-channel neural stimulation
We present the design of an integrated circuit for wireless neural stimulation, along with bench-top and in-vivo experimental results. The chip has the ability to drive 100 individual stimulation electrodes with constant-current pulses of varying amplitude, duration, interphasic delay, and repetition rate. The stimulation is done using a biphasic (cathodic and anodic) current source, injecting and retracting charge from the nervous system. Wireless communication and power are achieved over a 2.765-MHz inductive link. Only two off-chip components are needed to operate the stimulator: a 10-nF capacitor to aid in power supply regulation and a coil for power and command reception. The chip was fabricated in a commercially available 0.6-μm 2P3M BiCMOS process. The chip was able to activate motor fibers to produce muscle twitches via a Utah Slanted Electrode Array implanted in cat sciatic nerve, and to activate sensory fibers to recruit evoked potentials in somatosensory cortex.
Institute of Electrical and Electronics Engineers (IEEE)
Integrated circuits; Microelectrodes; Implants, Artificial; Biotelemetry; Neural stimulation; Cats as laboratory animals; Animal models in research
2008 IEEE Biomedical Circuits and Systems Conference; ; Baltimore, MD, USA
Thurgood, B. K., Ledbetter, N. M., Warren, D. J., Clark, G. A., & Harrison, R. R. (2008). Wireless integrated circuit for 100- channel neural stimulation. Proceedings of the 2008 IEEE Biomedical Circuits and Systems Conference (BioCAS 2008), 129-32.
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