Using a mathematical model of spinal cord stimulation, we found that a multi-source system with independent power sources for each contact can target more central points of stimulation on the dorsal column (100 vs 3) and has 50-fold more field steering resolution (0.02mm vs 1mm) than a single-source system.
Lee, D., Gillespie, E., Bradley, K. Dorsal Column Steerability with Dual Parallel Leads using Dedicated Power Sources: A Computational Model. J. Vis. Exp. (48), e2443, doi:10.3791/2443 (2011).