A 3-DoF robotic platform for the rehabilitation and assessment of reaction time and balance skills of MS patients

Abstract

The central nervous system (CNS) exploits anticipatory (APAs) and compensatory (CPAs) postural adjustments to maintain the balance. The postural adjustments comprising stability of the center of mass (CoM) and the pressure distribution of the body influence each other if there is a lack of performance in either of them. Any predictable or sudden perturbation may pave the way for the divergence of CoM from equilibrium and inhomogeneous pressure distribution of the body. Such a situation is often observed in the daily lives of Multiple Sclerosis (MS) patients due to their poor APAs and CPAs and induces their falls. The way of minimizing the risk of falls in neurological patients is by utilizing perturbation-based rehabilitation, as it is efficient in the recovery of the balance disorder. In light of the findings, we present the design, implementation, and experimental evaluation of a novel 3 DoF parallel manipulator to treat the balance disorder of MS. The robotic platform allows angular motion of the ankle based on its anthropomorphic freedom. Moreover, the end-effector endowed with upper and lower platforms is designed to evaluate both the pressure distribution of each foot and the CoM of the body, respectively. Data gathered from the platforms are utilized to both evaluate the performance of the patients and used in high-level control of the robotic platform to regulate the difficulty level of tasks. In this study, kinematic and dynamic analyses of the robot are derived and validated in the simulation environment. Low-level control of the first prototype is also successfully implemented through the PID controller. The capacity of each platform is evaluated with a set of experiments considering the assessment of pressure distribution and CoM of the foot-like objects on the end-effector. The experimental results indicate that such a system well-address the need for balance skill training and assessment through the APAs and CPAs.

I-BaR: integrated balance rehabilitation framework

“…Considering the design and development of robotic devices for lower extremity rehabilitation, there are mainly three types of system, that is, wearable exoskeleton system, ankle platform, and balance rehabilitation platform are proposed (Deng et al, 2018 ; Ersoy and Hocaoglu, 2023 ). Several examples of exoskeleton devices aim to increase the capacity of the lower limbs or reducing user effort (Pratt et al, 2004 ; Ferris et al, 2006 ; Dollar and Herr, 2008 ; Mooney et al, 2014 ).…”

Wearable Thimble-like Device for the Objective Follow-up and Therapy of Multiple Sclerosis

“…The performance evaluation of the volunteers during the experiments is carried out based on their upper extremity (hand-arm) coordination and accordingly grasping ability. The performance evaluation is mainly concentrated on task-based force control and reaction time [20] against slippage. The experiments are performed based on conducting two different tasks.…”