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Showing 1 to 16 of 16 for “"ankle-foot prosthesis"”.
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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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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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Design and Characterization of a Nonlinear Stiffening Spring for a Series-Elastic Ankle-Foot Prosthesis
… a lower extremity amputation every year. Powered ankle-foot prostheses greatly improve amputees’ walking experiences by replicating the biological motion of human gait. Series elastic actuators improve the prostheses, simulating the function of a biological tendon by storing and releasing energy …
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Estimation of ground reaction force and zero moment point on a powered ankle-foot prosthesis
Commercially available ankle-foot prostheses are passive when in contact with the ground surface, and thus, their mechanical properties remain fixed across different terrains and walking speeds. The passive nature of these prostheses causes many problems for lower extremity amputees, such as a lack …
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Mechatronic Design and Evaluation of a Two-Degree-of-Freedom Powered Ankle-Foot Prosthesis with Myoneural Interfacing Capabilities
… have opened new possibilities for enhanced prosthesis control. The agonist-antagonist myoneural interface (AMI) connects residual muscle pairs to emulate natural dynamics, while electronic osseointegrated prostheses for the rehabilitation of amputees (eOPRA) allow direct measurement of …
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Design and Evaluation of a Quasi-Passive Variable Stiffness Ankle-Foot Prosthesis to Improve Biomechanics Across Walking Speeds
… due to insufficient push-off power from the prosthesis and increased limb loading on the contralateral side [4]. This thesis presents an ankle-foot prosthesis which increases energy storage and return, increases peak power, and decreases contralateral limb loading in a low-mass, quasi-passive …
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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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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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A data-driven neuromuscular model of walking and its application to prosthesis control
… model of human walking and its application to prosthesis control. The model is novel in that it leverages tendon elasticity to more accurately predict the metabolic consumption of walking than conventional models. Paired with a reflex-based neural drive the model has been applied in the control …
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A vibrotactile display design for the feedback of external prosthesis sensory information to the amputee wearer
… display to be incorporated into a powered ankle-foot prosthesis. Although existing devices have addressed the need for tactile and proprioceptive feedback in external prostheses, there has not yet been an attempt to develop and clinically evaluate a comprehensive vibrotactile display and …
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Design and Evaluation of a Powered Series-Elastic Cycloidal Ankle (CyAn) Prosthesis
… enhance user mobility and comfort. A promising prosthesis solution are powered ankle-foot prostheses, which have the potential to provide biologically accurate push-off power, thereby offering significant benefits such as improved walking economy, increased mobility, and reduced impact forces on …
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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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Development and evaluation of biarticular transtibial prostheses for level-ground amputee walking
… limited because they only emulate the biological ankle-foot complex. In contrast, the gastrocnemius calf muscle spans both the ankle and knee joint, and thus provides biarticular function. Therefore, it may be prudent for transtibial prostheses to include actuation at both the ankle and knee …