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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 58 for “"ankle-foot"”.
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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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The design and control of active ankle-foot orthoses
Ankle foot orthoses (AFOs) can be used to ameliorate the impact of impairments to the lower limb neuromuscular motor system that affect gait. Existing AFO technologies include passive devices with fixed and articulated joints, semi-active devices that modulate damping at the joint and active …
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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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Powered ankle-foot prosthesis for the improvement of amputee walking economy
The human ankle provides a significant amount of net positive work during the stance period of walking, especially at moderate to fast walking speeds. On the contrary, conventional ankle-foot prostheses are completely passive during stance, and consequently, cannot provide net positive work. …
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A neuromuscular-model based control strategy for powered ankle-foot prostheses
In the development of a powered ankle-foot prosthesis, it is desirable to provide the prosthesis with the ability to exhibit human-like dynamics. A simple method for achieving this goal involves trajectory tracking, where a specific target torque trajectory is known, and the controller issues …
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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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Investigation of bench methods for determining stiffness of solid ankle-foot orthoses
The applications of ankle-foot orthoses (AFOs) are nowadays the most common treatment for the compensation of neuromuscular disorders usually caused by stroke and spinal cord or peripheral nerve injuries. The biomechanical functions of plastic AFOs are determined by their thickness, the material …
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Design and development of mechanical metatarsophalangeal joint for powered ankle-foot prostheses
… to test a proof of concept for a passive ankle-foot prosthesis with an MTP joint, but can also be adapted to use an actuated joint in the future. To increase the user's range of motion, our aim was for the mechanical MTP joint to achieve a maximum 600 dorsiflexion angle. We developed 2 MTP …
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Study of mechanical characteristics of ankle-foot orthoses using finite element analysis method
Ankle-foot orthoses (AFOs) are external devices applied to the lower leg segment in patients with ankle joint impairment due to neuromusculoskeletal disorders resulting in abnormal gait. In the last three decades, plastic AFOs have superseded conventional metal AFOs. Prescriptions of AFOs by …
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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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Design and control of a Two-Degree-of-Freedom powered ankle-foot prosthesis
Powered ankle prostheses have been proven to improve the walking economy of transtibial amputees although these powered systems are usually much heavier in weight than conventional prostheses. All commercial powered ankle prostheses that are currently available can only perform …
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Neurally-controlled ankle-foot prosthesis with non-backdrivable transmission for rock climbing augmentation
… design and evaluation of a neurally-controlled ankle-foot prosthesis optimized to enhance rock climbing ability in persons with transtibial amputation. The bionic rock climbing prosthesis restores biologic performance of the ankle-foot complex. The user volitionally controls the positions of …
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Biomechanical adaptations involved in ramp descent: Impact of microprocessor-controlled ankle-foot prothesis. Kinetic and kinematic responses to using microprocessor-controlled ankle-foot prosthesis in unilateral trans-tibial amputees during ramp descent
… body weight progression over the prosthetic foot. A deeper understanding of the impact of foot function on ramp descent biomechanics is required to make recommendations for rehabilitation programs and prosthetic developments for lower-limb amputees. The thesis aim was to determine the …
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An Investigation into composite additive manufacturing of dynamic response paediatric prosthetic ankle-foot devices
… for producing dynamic response paediatric ankle-foot prosthetics. It addresses challenges faced by children with lower-limb absence, particularly in accessing prosthetics that support active lifestyles and sports participation. A systematic literature review identified major barriers, …
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