Ankle–knee prosthesis with active ankle and energy transfer: Development of the CYBERLEGs Alpha-Prosthesis |
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| Affiliation: | 1. School of Biological Science and Medical Engineering, Beihang University, No. 37, XueYuan Road, HaiDian District, Beijing 100083, China;2. Beijing Medical Implant Engineering Research Center, Beijing Naton Technology Group Co. LTD, Beijing 100082, China;3. Beijing Engineering Laboratory of Functional Medical Materials and Devices, Beijing Naton Technology Group Co. LTD, Beijing 100082, China;4. Institute of Tribology, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China;5. Japan Research Institute of Artificial Joint, Research Institute of Rheumatology Medical Treatment, Tokyo 104-0032, Japan;6. Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100083, China;1. Robotics and Multibody Mechanics Research Group (R&MM), Vrije Universiteit Brussel, Pleinlaan 2, 1050 Elsene, Belgium;2. Institute for Mechatronic Systems in Mechanical Engineering, Technische Universität Darmstadt, Otto-Berndt-Straße 2, 64287 Darmstadt, Germany |
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| Abstract: | This paper presents the development of the CYBERLEGs Alpha-Prototype prosthesis, a new transfemoral prosthesis incorporating a new variable stiffness ankle actuator based on the MACCEPA architecture, a passive knee with two locking mechanisms, and an energy transfer mechanism that harvests negative work from the knee and delivers it to the ankle to assist pushoff. The CYBERLEGs Alpha-Prosthesis is part of the CYBERLEGs FP7-ICT project, which combines a prosthesis system to replace a lost limb in parallel with an exoskeleton to assist the sound leg, and sensory array to control both systems. The prosthesis attempts to produce a natural level ground walking gait that approximates the joint torques and kinematics of a non-amputee while maintaining compliant joints, which has the potential to decrease impulsive losses, and ultimately reduce the end user energy consumption. This first prototype consists of a passive knee and an active ankle which are energetically coupled to reduce the total power consumption of the device. Here we present simulations of the actuation system of the ankle and the passive behavior of the knee module with and without the energy transfer effects, the mechanical design of the prosthesis, and empirical results from testing of the physical device with amputee subjects. |
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| Keywords: | Prosthesis Knee Ankle Energy efficiency Transfemoral CYBERLEGs Active Energy transfer |
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