3 research outputs found
Advances in Scalable Implantable Systems for Neurostimulation Using Networked ASICs
Neurostimulation is a known method for restoring
lost functions to neurologically impaired patients. This paper
describes recent advances in scalable implantable stimulation
systems using networked application specific integrated circuits
(ASICs). It discusses how they can meet the ever-growing
demand for high-density neural interfacing and long-term
reliability. A detailed design example of an implantable
(inductively linked) scalable stimulation system for restoring
lower limb functions in paraplegics after spinal cord injury is
presented. It comprises a central hub implanted at the costal
margin and multiple Active Books which provide the interface for
stimulating nerve roots in the cauda equina. A 16-channel
stimulation system using four Active Books is demonstrated. Each
Active Book has an embedded ASIC, which is responsible for
initiating stimulus current to the electrodes. It also ensures device
safety by monitoring temperature, humidity, and peak electrode
voltage during stimulation. The implant hub was implemented
using a microcontroller-based circuit. The ASIC in the Active
Book was fabricated using XFAB’s 0.6-µm high-voltage CMOS
process. The stimulation system does not require an accurate
reference clock in the implant. Measured results are provided
IEEE Transactions on Biomedical Circuits And Systems: Vol. 7, No. 4, Agustus 2013
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