title: LOPES II--Design and Evaluation of an Admittance Controlled Gait Training Robot With Shadow-Leg Approach.
abstract: Robotic gait training is gaining ground in rehabilitation. Room for improvement lies in reducing donning and doffing time, making training more task specific and facilitating active balance control, and by allowing movement in more degrees of freedom. Our goal was to design and evaluate a robot that incorporates these improvements. LOPES II uses an end-effector approach with parallel actuation and a minimum amount of clamps. LOPES II has eight powered degrees of freedom (hip flexion/extension, hip abduction/adduction, knee flexion/extension, pelvis forward/aft and pelvis mediolateral). All other degrees of freedom can be left free and pelvis frontal- and transversal rotation can be constrained. Furthermore arm swing is unhindered. The end-effector approach eliminates the need for exact alignment, which results in a donning time of 10-14 min for first-time training and 5-8 min for recurring training. LOPES II is admittance controlled, which allows for the control over the complete spectrum from low to high impedance. When the powered degrees of freedom are set to minimal impedance, walking in the device resembles free walking, which is an important requisite to allow task-specific training. We demonstrated that LOPES II can provide sufficient support to let severely affected patients walk and that we can provide selective support to impaired aspects of gait of mildly affected patients.
authors.forename: Jos
authors.initials: J
authors.lastname: Meuleman
authors.forename: Edwin
authors.initials: E
authors.lastname: van Asseldonk
authors.forename: Gijs
authors.initials: G
authors.lastname: van Oort
authors.forename: Hans
authors.initials: H
authors.lastname: Rietman
authors.forename: Herman
authors.initials: H
authors.lastname: van der Kooij
mesh_terms: D000886:Anthropometry; D001132:Arm; D020233:Gait Disorders, Neurologic / Q000534:rehabilitation*; D006615:Hip; D006801:Humans; D007717:Knee; D010388:Pelvis; D004856:Postural Balance; D011474:Prosthesis Design; D012371:Robotics; D013119:Spinal Cord Injuries / Q000534:rehabilitation; D000071939:Stroke Rehabilitation; D014584:User-Computer Interface