Development of a Loading Test Device for Prosthetic Feet Based on ISO22675 (Dynamic Roll-over Analysis Using 3-Axis Pylon Load Cell)

概要

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A prosthetic foot is one of the key components to realize stable and efficient amputee gait. Characteristics and comfort of the amputee gait depend on the mechanical properties of prosthetic feet. In order to clarify the effects of dynamical amputee gait on prosthetic feet, we should focus on the individual mechanical properties of prosthetic feet unlike the conventional methods with a prosthesis applied to the able-bodied person. From this point of view, this paper describes the construction of a dynamic loading test device based on ISO22675, with a 3-axis pylon load cell for evaluating mechanical properties of prosthetic feet in sagittal plane. It is confirmed that a 3-axis pylon load cell applied to a cantilever structure shows high sensitivity under loading condition of ISO22675. On the dynamic roll-over analysis of three kinds of prosthetic feet in sagittal plane, the following properties that precedent studies provided are experimentally confirmed : the roll-over shape of a prosthetic foot for low activity user shows a large curvature in the middle period of stance phase. It is also found that the mechanical deformation property does not change under the test cycles of 2.0 and 4.0[s], because both FCP (Force Contact Point) trajectories during roll-over show a similar tendency.