Journal
INTERNATIONAL JOURNAL OF ROBOTICS RESEARCH
Volume 37, Issue 8, Pages 953-976Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0278364918785993
Keywords
Rehabilitation robotics; human-centered and life-like robotics; mechanism design; mechanics; design; and control; physical human-robot interaction; simulation; interfaces; and virtual reality; kinematics
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We present a lightweight robotic knee prosthesis with a novel hybrid actuation system that enables passive and active operation modes. The proposed hybrid knee uses a spring-damper system in combination with an electric motor and transmission system, which can be engaged to provide a stair ambulation capability. In comparison to fully powered prostheses that power all ambulation activities, a hybrid knee prosthesis can achieve significant weight reduction by focusing the design of the actuator on a subset of activities without losing the ability to produce equivalent torque and mechanical power in the active mode. The hybrid knee prototype weighs 1.7 kg, including battery and control, and can provide up to 125 Nm of repetitive torque. Experiments with two transfemoral amputee subjects show that the proposed hybrid knee prosthesis can support walking on level ground in the passive mode, as well as stair ambulation with a reciprocal gait pattern in the active mode.
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