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Showing 1 to 20 of 27 for “"ankle-foot orthosis"”.
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Design and control of an active ankle-foot orthosis
Active ankle-foot orthoses (AAFOs) assist a user unable to dorsiflex the ankle joint. The optimal AAFO is lightweight and aids the user in achieving a nominal gait. This thesis presents the design and control of a novel discrete nonlinear series elastic actuator for AAFOs. The actuator uses …
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Design of A Variable-Stiffness Ankle-Foot Orthosis Emulator
Ankle-foot orthoses (AFOs) are passive devices used to improve gait in children with cerebral palsy. They are characterized by a torsional stiffness and ankle neutral angle. For this project, a lightweight ankle exoskeleton was designed to emulate the spring-like behavior of a traditional AFO for a …
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Identification, Simulation and Control of an Ankle Foot Orthosis
Drop foot is a neuromuscular condition affecting many patients with abnormality in the walking pattern. The most common treatment to address this condition is ankle foot orthoses. This research presents a study on development of an identified model for a torsional shape memory alloy-based ankle …
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Development of an Industrially Deployable Personalized Ankle–Foot Orthosis System
… validation of a personalized, field-deployable ankle–foot orthosis (AFO) system designed to assist industrial tasks like squatting. Industrial workers frequently suffer from lower limb fatigue and musculoskeletal injuries due to repetitive lifting and squatting. While robotic AFOs have shown …
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Evaluation of a pneumatic ankle-foot orthosis: portability and functionality
… Our lab has developed a pneumatically powered ankle-foot orthosis (PPAFO) to address some of these issues. In this dissertation, we address the issue of availability of portable pneumatic power sources, and we evaluate the short-term kinematic and metabolic impact of a bilateral, bidirectional …
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Control System for Outdoor Use of Powered Portable Ankle-Foot Orthosis
… a lower-limb exoskeleton, the Powered Portable Ankle-Foot Orthosis (PPAFO), designed to assist both individuals with motor disabilities and healthy subjects in various outdoor settings. The work begins by reviewing relevant literature and prior work in the field of gait analysis, embedded …
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Force-controllable ankle foot orthosis (AFO) to assist drop foot gait
Drop foot, a loss of use of the muscles that lift the foot, can be caused by stroke, cerebral palsy (CP), multiple sclerosis (MS), or neurological trauma. The two major complications of drop foot are slapping of the foot after heel strike (foot slap) and dragging of the toe during swing (toe drag). …
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The Application of Series Elastic Actuators in the Hydraulic Ankle-Foot Orthosis
… wearable device that fits into this trend is the Ankle-Foot Orthosis (AFO), which is a device that restrains or strengthens the movement of an ankle to assist the user during gait. A powered AFO uses an actuator and power supply to add positive power to the ankle but becomes heavier as the power …
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On improving control and efficiency of a portable pneumatically powered ankle-foot orthosis
Ankle foot orthoses (AFOs) are widely used as assistive and/or rehabilitation devices to correct gait of people with lower leg neuromuscular dysfunction and muscle weakness. An AFO is an external device worn on the lower leg and foot that provides mechanical assistance at the ankle joint. Active …
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Adaptive gait strategies of healthy individuals walking with a novel bi-linear stiffness ankle-foot orthosis
Ankle-foot orthoses are a category of biomechanical assistive devices intended to address a variety of gait impairments by providing support and stability about the ankle joint. Passive-dynamic AFOs (PD-AFOs) are broadly designed with a foot plate, a cuff that wraps around the shank, and a strut …
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Studies on gait control using a portable pneumatically powered ankle-foot orthosis (PPAFO) during human walking
Made available in DSpace on 2016-07-07T20:26:50Z (GMT). No. of bitstreams: 4 ISLAM-DISSERTATION-2016.pdf: 2986591 bytes, checksum: b3e0c01386cedef04324fd7c5c8364ac (MD5) MI_Dissertation_v10.docx: 31867526 bytes, checksum: 1732a101227727851c94d28e1c9729f3 (MD5) LICENSE.txt: 4211 bytes, checksum: …
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Individual plantar flexor compensation during walking with a unilateral passive dynamic ankle-foot orthosis : a simulation study
Ankle foot orthoses (AFOs) are designed to improve walking ability in persons with a variety of musculoskeletal and neuromuscular disorders. Passive dynamic AFOs (PD-AFOs) are a special class of orthoses that function like a torsional spring, which store elastic energy in early stance and release …
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Evaluation of gait kinematics and kinetics using a powered ankle-foot orthosis for gait assistance in people with multiple sclerosis
… For people with MS who suffer from drop foot (i.e., the diminished or lack of ability to dorsiflex the foot), prescription of a passive ankle-foot orthosis is common. The purpose of these devices is to hold the foot in neutral position and prevent the foot from dropping during forward …
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Design of actuation system and minimization of sensor configuration for gait event detection for Gen 3.0 Portable Powered Ankle-Foot Orthosis (PPAFO)
Powered ankle-foot orthoses (AFOs), which are capable of providing assistive torque at the ankle joint, have significant potential as both assistance and rehabilitation devices. Technology advancements have led to great progression in the development of powered AFOs. Our group had developed the …
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Measuring the functional and clinical effectiveness of a passive dynamic ankle foot orthosis when used to rehabilitate complex limb salvage post lower limb blast trauma
Summary: Studies suggest passive dynamic ankle foot orthoses (PD AFO) are effective at improving gait and patient reported outcomes measures (PROM) in personnel who have undergone limb salvage due to blast trauma. Studies using PD AFOs have included able bodied and personnel with variable clinical …
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Understanding the effects of wearing a quantitatively prescribed passive-dynamic ankle-foot orthosis on the mechanical cost-of-transport and gait velocity in individuals post-stroke
… are commonly prescribed passive-dynamic ankle-foot orthoses (PD-AFOs) to aid in the control of shank forward rotation during mid-to- terminal stance due to plantar flexor weakness. PD-AFO bending stiffness is a key orthotic characteristic that can assist the plantar flexor muscles by …
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The effect of ankle-foot orthosis on gait and the procedures used to assess bi-articular muscle length and spasticity in subjects with diplegic cerebral palsy
Ankle-foot orthoses are commonly prescribed amongst subjects with diplegic cerebral palsy as a conservative orthotic intervention. Multi-articular and bi-articular muscles are more severely involved in subjects with diplegic cerebral palsy. Appropriate clinical assessment including assessment of …
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Strategies for using electromyographic signals to control ankle torque in an active joint brace for alleviating drop-foot gait
… from the anterior tibialis muscle to control ankle torque in an active ankle-foot orthosis. This would ultimately help rehabilitate persons affected by drop-foot gait, a condition which results in the loss of ability to dorsi-flex the ankle. This causes dropping of the toe during the swing …
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Modulation and modeling of anticipatory postural adjustments for gait initiation in persons with Parkinson's disease
… the desired motion during an APA provided at the ankle joint in the form of modest ankle torques has been tested. The overall research objective of this dissertation work was to test the hypothesis that mechanical assistance provided at the ankle joint can be an effective paradigm for facilitating …
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The use of Tone Relieving Ankle-Foot Orthoses in the management of children with cerebral palsy
Tone Relieving Ankle Foot Orthoses (TRAFOs) have been used in the management ofneurophysically impaired patients for some years within the United States and during thelast few years they have been introduced in the UK. The main difference between aTRAFO and a standard polypropylene ankle foot …
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