Title: Development of an above-knee prosthesis equipped with a microcomputer-controlled knee joint: first test results
Authors: Aeyels, B ×
Peeraer, Louis
Vander Sloten, Jos
Van der Perre, Georges #
Issue Date: May-1992
Publisher: Butterworth Scientific Ltd. Publishers
Series Title: Journal of Biomedical Engineering vol:14 issue:3 pages:199-202
Abstract: The shortcomings of conventional above-knee prostheses are due to their lack of adaptive control. Implementation of a microcomputer controlling the knee joint in a passive way has been suggested to enhance the patient's gait comfort, safety and cosmesis. This approach was used in the design of a new prosthetic system for the above-knee amputee, and tested on one patient. The knee joint of a conventional, modular prosthesis was replaced by a knee joint mechanism, equipped with a controllable brake on the knee joint axis. Sensors and a microcomputer were added, keeping the system self-contained. The modularity of the design permits the use of an alternative, external, PC-based control unit, emulating the self-contained one, and offering extended data monitoring and storage facilities. For both units an operating environment was written, including sensor/actuator interfacing and the implementation of a real-time interrupt, executing the control algorithm. A double finite state approach was used in the design of the control algorithm. On a higher level, the mode identification algorithm reveals the patient's intent. Within a specific mode (lower level), the relevant mode control algorithm looks for the current phase within the gait cycle. Within a particular phase, a specific simple control action with the brake replaces normal knee muscle activity. Tests were carried out with one prosthetic patient using a basic control algorithm for level walking, allowing controlled knee flexion during stance phase. The technical feasibility of such a concept is illustrated by the test results, even though only flexion during early stance phase was controlled during the trials.(ABSTRACT TRUNCATED AT 250 WORDS)
ISSN: 0141-5425
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Biomechanics Section
Research Group for Musculoskeletal Rehabilitation
Health Care and Chemistry Department - Geel Campus - TM K
× corresponding author
# (joint) last author

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