Feasibility Study for Enhancing Gait Following Stroke With Implanted Microstimulators

The primary objective (Aim I) of this study is to evaluate whether the RFM Gait System can restore the capability to perform the components of gait required for safe, functional walking, for patients in the chronic phase after stroke (\> 12 months). We will assess the treatment provided by the RFM system at the Cleveland VA compared to the FNS percutaneous Schreiner electrodes and custom-designed controller previously investigated by the investigators. The similarities between the RFM-based and percutaneous FNS systems will be assessed using six gait components required for the execution of functional, safe gait, which are lower limb strength, coordination, an index of walking endurance, muscle tone, walking speed, and quality of life. The secondary objective of this study is to test the technological performance and safety of the RFM Gait System. Measures of technology performance and safety include implantation time; anchoring capability at the motor point of the muscle; reliability of the RFMs during use; reliability of electrical performance of the system; comfort of the system (with stimulation off); comfort of the electrical stimulus.