A tripolar current-steering stimulator ASIC for field shaping in deep brain stimulation

Valente, V. and Demosthenous, A. and Bayford, Richard A tripolar current-steering stimulator ASIC for field shaping in deep brain stimulation. IEEE Transactions on Biomedical Circuits and Systems, 6 (3). pp. 197-207. ISSN 1932-4545

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Abstract

A significant problem with clinical deep brain stimulation (DBS) is the high variability of its efficacy and the frequency of side effects, related to the spreading of current beyond the anatomical target area. This is the result of the lack of control that current DBS systems offer on the shaping of the electric potential distribution around the electrode. This paper presents a stimulator ASIC with a tripolar current-steering output stage, aiming at achieving more selectivity and field shaping than current DBS systems. The ASIC was fabricated in a 0.35-μ m CMOS technology occupying a core area of 0.71 mm2. It consists of three current sourcing/sinking channels. It is capable of generating square and exponential-decay biphasic current pulses with five different time constants up to 28 ms and delivering up to 1.85 mA of cathodic current, in steps of 4 μA, from a 12 V power supply. Field shaping was validated by mapping the potential distribution when injecting current pulses through a multicontact DBS electrode in saline.

Item Type: Article
Research Areas: A. > School of Science and Technology > Natural Sciences
A. > School of Science and Technology > Natural Sciences > Biophysics and Bioengineering group
Item ID: 11095
Useful Links:
Depositing User: Devika Mohan
Date Deposited: 01 Jul 2013 08:45
Last Modified: 13 Oct 2016 14:27
URI: http://eprints.mdx.ac.uk/id/eprint/11095

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