Stretchable, Long-Term Neural Implant on the Spinal Cord Could Restore
  Walking
From: NASA Tech Briefs - 01/29/2015

So-called "surface implants" can't be applied long-term to the spinal cord or
brain, beneath the nervous system's protective envelope (known as the dura
mater), because when nerve tissues move or stretch, they rub against the
rigid devices. Now, scientists from the Swiss Federal Institute of Technology
in Lausanne have introduced the e-Dura implant, designed specifically for
implantation on the surface of the brain or spinal cord. The neural implant
combines electrical and chemical stimulation and has successfully made
paralyzed rats walk again.

Read the entire article and view a video (1:50) at:
http://www.techbriefs.tv/video.mason/A-neural-implant-stays-in-the-l;Medical

Links:
Electronic dura mater for long-term multimodal neural interfaces
http://www.sciencemag.org/content/347/6218/159.short

Neuroprosthetics for paralysis: an new implant on the spinal cord
http://actu.epfl.ch/news/neuroprosthetics-for-paralysis-an-new-implant-on-t/