Journal article
A new device concept for directly modulating spinal cord pathways: initial in vivo experimental results
Physiological measurement, Vol.33(12), pp.2003-2015
11/15/2012
DOI: 10.1088/0967-3334/33/12/2003
PMID: 23151433
Abstract
We describe a novel spinal cord (SC) stimulator that is designed to overcome a major shortcoming of existing stimulator devices: their restricted capacity to selectively activate targeted axons within the dorsal columns. This device overcomes that limitation by delivering electrical stimuli directly to the pial surface of the SC. Our goal in testing this device was to measure its ability to physiologically activate the SC and examine its capacity to modulate somatosensory evoked potentials (SSEPs) triggered by peripheral stimulation. In this acute study on adult sheep (n = 7), local field potentials were recorded from a grid placed in the subdural space of the right hemisphere during electrical stimulation of the left tibial nerve and the spinal cord. Large amplitude SSEPs (>200 µV) in response to SC stimulation were consistently obtained at stimulation strengths well below the thresholds inducing neural injury. Moreover, stimulation of the dorsal columns with signals employed routinely by devices in standard clinical use, e.g., 50 Hz, 0.2 ms pulse width, produced long-lasting changes (>4.5 h) in the SSEP patterns produced by subsequent tibial nerve stimulation. The results of these acute experiments demonstrate that this device can be safely secured to the SC surface and effectively activate somatosensory pathways.
Details
- Title: Subtitle
- A new device concept for directly modulating spinal cord pathways: initial in vivo experimental results
- Creators
- Oliver Flouty - University of Iowa Hospitals and Clinics Department of Neurosurgery, Iowa City, IA, USAHiroyuki Oya - University of Iowa Hospitals and Clinics Department of Neurosurgery, Iowa City, IA, USAHiroto Kawasaki - University of Iowa Hospitals and Clinics Department of Neurosurgery, Iowa City, IA, USASaul Wilson - University of Iowa Hospitals and Clinics Department of Neurosurgery, Iowa City, IA, USAChandan G Reddy - University of Iowa Hospitals and Clinics Department of Neurosurgery, Iowa City, IA, USANicholas D Jeffery - Iowa State University Department of Veterinary Clinical Sciences, Ames, IA, USATimothy J Brennan - University of Iowa Hospitals and Clinics Department of Anesthesia, Iowa City, IA, USAKatherine N Gibson-Corley - University of Iowa Hospitals and Clinics Department of Pathology, Iowa City, IA, USAMarcel Utz - University of Virginia Department of Mechanical and Aerospace Engineering, Charlottesville, VA, USAGeorge T Gillies - University of Virginia Department of Physics, Charlottesville, VA, USAMatthew A Howard - University of Iowa Hospitals and Clinics Department of Neurosurgery, Iowa City, IA, USA
- Resource Type
- Journal article
- Publication Details
- Physiological measurement, Vol.33(12), pp.2003-2015
- Publisher
- IOP Publishing
- DOI
- 10.1088/0967-3334/33/12/2003
- PMID
- 23151433
- ISSN
- 0967-3334
- eISSN
- 1361-6579
- Language
- English
- Date published
- 11/15/2012
- Academic Unit
- Neurology; Pathology; Iowa Neuroscience Institute; Anesthesia; Neurosurgery; Otolaryngology; Ophthalmology and Visual Sciences
- Record Identifier
- 9984013108002771
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