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System and method for motion-controlled foot unit

  • US 7,811,334 B2
  • Filed: 02/11/2005
  • Issued: 10/12/2010
  • Est. Priority Date: 02/12/2004
  • Status: Active Grant
First Claim
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1. A prosthetic system for mimicking the natural movement of an ankle, the prosthetic system comprising:

  • a prosthetic foot;

    a pivot assembly attached to a pivot location on the prosthetic foot, wherein the pivot location is near a natural ankle location of the prosthetic foot;

    a lower limb member extending in a tibial direction, the lower limb member having an upper end and a lower end, wherein the lower end of the lower limb member is operatively coupled to the prosthetic foot via the pivot assembly;

    an actuator operatively coupled to the prosthetic foot and to the lower limb member, wherein the actuator is configured to actively adjust an angle between the lower limb member and the prosthetic foot about the pivot assembly; and

    a processing module configured to instruct the actuator to actively adjust the angle between the lower limb member and the prosthetic foot, wherein during a swing phase of the prosthetic foot during movement by a user of the prosthetic system on a surface, the processing module is configured to instruct the actuator to adjust the angle first to a dorsiflexed position and then to a plantarflexed position before contacting the surface with the prosthetic foot.

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