Affiliation:
1. Department of Mechanical Engineering, San Jose State University , One Washington Square, San Jose, CA 95192
Abstract
Abstract
Millions of people with disabilities, the elderly, and individuals suffering from physical deformities rely on assistive devices to perform basic actions and movements. With the increasing number of these individuals, the lack of available medical equipment/assistive personnel, and the size, bulkiness, and cost of assistive devices found in rehabilitation centers, there has been a growing interest in the research for lighter, portable, and cost-effective personal external assistive devices. In this paper, a new prototype of an ankle-foot exoskeleton was engineered with low-cost printed material that maintains structural integrity while providing appropriate comfort and support for the wearer. This ankle-foot exoskeleton was fabricated using thermoplastic polyurethane (TPU) and polylactic acid (PLA), common materials used for three-dimensional printing. The printed pieces were combined with zinc-nickel hinge joints to create a one-degree-of-freedom (DOF) support system. Finite element analysis on both fabricated parts indicates an average safety factor of 4 at applied loads of 700 N and 100 N to the foot and calf sections respectively. A pressure insole system consisting of a silicone-based pressure mold, force-sensitive resistors, and a microcontroller circuit was developed to measure foot pressure experienced during standing and stepping motion. This exoskeleton was also subjected to actuation tests via an external torque motor to obtain ankle trajectory profiles at various walking speeds.
Reference28 articles.
1. Ankle Resistance With a Unilateral Soft Exosuit Increases Plantarflexor Effort During Pushoff in Unimpaired Individuals;J. Neuroeng. Rehabil.,2021
2. Musculoskeletal Conditions of the Foot and Ankle: Assessments and Treatment Options;Best Pract. Res., Clin. Rheumatol.,2012
3. Global, Regional, and Country-Specific Lifetime Risks of Stroke, 1990 and 2016;GBD 2016 Lifetime Risk of Stroke Collaborators;N. Engl. J. Med.,2018
4. A Review on Lower Limb Rehabilitation Exoskeleton Robots;Chin. J. Mech. Eng.,2019
5. Lower Limb Exoskeleton Systems—Overview;Rosen,2020