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Powered ankle-foot prothesis

  • US 8,512,415 B2
  • Filed: 06/12/2008
  • Issued: 08/20/2013
  • Est. Priority Date: 03/31/2005
  • Status: Active Grant
First Claim
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1. A device comprising:

  • a) a mechanical ankle joint that is a rotational joint bearing axis which joint defines an angle between two structures that are joined by the joint, which angle can vary over a first range of angles during normal operation of the device;

    b) a controllable actuator comprising a motor connected to a series spring for imparting a first torque about the joint; and

    c) a parallel spring connected in parallel with the actuator, for imparting a second torque about the joint only when the angle is within a second range of angles, the second range being a subset of, and not identical to, the first range.

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