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Paper ThA108.2

Crocher, Vincent (Université Pierre et Marie Curie - Paris 6, ISIR, CNRS-UMR 7222), Jarrassé, Nathanaël (University Pierre et Marie Curie - Paris6), SAHBANI, ANIS (Université Pierre et Marie Curie - Paris 6), Roby Brami, Agnès (Université René Descartes Paris V), Morel, Guillaume (Univ. Pierre et Marie Curie - Paris 6)

Changing Human Upper-Limb Synergies with an Exoskeleton Using Viscous Fields

Scheduled for presentation during the Regular Sessions "Rehabilitation Robotics V" (ThA108), Thursday, May 12, 2011, 08:35−08:50, Room 5C

2011 IEEE International Conference on Robotics and Automation, May 9-13, 2011, Shanghai International Conference Center, Shanghai, China

This information is tentative and subject to change. Compiled on May 23, 2019

Keywords Rehabilitation Robotics, Physical Human-Robot Interaction, Redundant Robots

Abstract

Robotic exoskeletons can apply forces distributed on the limbs of the subject they are connected to. This offers a great potential in the field of neurorehabilitation, to address the impairment of interjoint coordination in hemiparetic stroke patients. In these patients, the normal flexible joint rotation synergies are replaced by pathological fixed patterns of rotation. In this paper, we investigate how the concept of synergy can be exploited in the control of an upper limb exoskeleton. The long term goal is to develop a device capable of changing the joint synchronization of a patient performing exercises during rehabilitation.

The paper presents a controller able of generating joint viscous torques in such a way that constraints on joint velocities can be imposed to the subject without constraining the hand motion. On another hand, the same formalism is used to describe synergies observed on the arm joint motion of subjects realizing pointing tasks.

This approach is experimented on a 4 Degrees of Freedom (DoF) upper arm exoskeleton with subjects performing pointing 3-dimensional tasks. Results exhibit the basic properties of the controller and show its capacity to impose an arbitrary chosen synergy without affecting the hand motion.

 

 

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