Ambulating ankle and knee joints with bidirectional dampening and assistance using elastomeric restraint
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United States of America Patent
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Jan 24, 2012
Grant Date -
Nov 22, 2007
app pub date -
Nov 15, 2006
filing date -
Apr 25, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A hinge or joint assembly includes a first member movably connected to a second member to allow angular displacement of the first member relative to the second member in each of extension and flexion (clockwise and counterclockwise) directions, where one elastomeric spring restrains angular displacement in a flexion position, and another elastomeric spring restrains angular displacement in an extension position. In each direction, the angular movement is dampened through compression of the respective elastomeric spring. After dampening the movement in either direction, returning movement is assisted through decompression of the respective elastomeric spring. Alternatively, one or more elastomeric springs are arranged to both dampen through compression and assist through decompression angular movement in each of the flexion and extension directions. The elastomeric spring can provide a pre-determined force deflection curve in compression and an independent rate of return hysteresis in decompression. The elastomeric springs could be urethane.
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