A six-degree-of-freedom robotic system for lower extremity rehabilitation

This paper describes the design, control and implementation of a sensorized robotic platform for versatile rehabilitation of stroke patients living with lower extremity neuromuscular deficit. The proposed device is composed of a six-degree-of-freedom actuation mechanism with a large workspace for lower extremity rehabilitation regimens. With a small footprint, lightweight, and low-cost design and a wireless interface this device is portable and well-suited for at-home and in-clinic use. A custom six-degree-of-freedom force/torque sensor was developed to measure real-time patient forces, and an admittance controller was implemented to provide assistive motion therapy. The results obtained show the suitability of this device for human-robot interaction for the implementation of lower extremity rehabilitation therapy.