What do you think of this by Dr. Courtine? Id think it would be a problem as its more invasive. But it claims its more effective.

Soft subdural implant

The team of Dr. Gr?goire Courtine, based at the Swiss Federal Institute of Technology (EPFL) in Lausanne, developed a flexible and stretchy implant that is placed under the protective layer.The innovative device supplies power to living tissue. A technology with many advantages:
1) Lower stimulation energy preserves the material (stimulator, wires or electrode).
2) Longer lifetime of the battery pack.
3) Less risk creating damage in the spinal cord tissue