Soft-coupling suspension system for an intradural spinal cord stimulator: Biophysical performance characteristics

H. Oya, S. Safayi, N. D. Jeffery, S. Viljoen, C. G. Reddy, Brian D. Dalm, J. K. Kanwal, G. T. Gillies, M. A. Howard

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

We have characterized the mechanical compliance of an improved version of the suspension system used to position the electrode-bearing membrane of an intradural neuromodulator on the dorsal pial surface of the spinal cord. Over the compression span of 5 mm, it exhibited a restoring force of 2.4 μN μm-1 and a mean pressure of 0.5 mm Hg (=66 Pa) on the surface below it, well within the range of normal intrathecal pressures. We have implanted prototype devices employing this suspension and a novel device fixation technique in a chronic ovine model of spinal cord stimulation and found that it maintains stable contact at the electrode-pia interface without lead fracture, as determined by measurement of the inter-contact impedances.

Original languageEnglish (US)
Article number164701
JournalJournal of Applied Physics
Volume114
Issue number16
DOIs
StatePublished - Oct 28 2013

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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