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Leg prosthesis with an artificial knee joint and method for controlling a leg prosthesis

  • US 6,755,870 B1
  • Filed: 08/21/2000
  • Issued: 06/29/2004
  • Est. Priority Date: 12/24/1998
  • Status: Expired due to Term
First Claim
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1. A leg prosthesis comprising:

  • a thigh portion;

    a lower leg portion;

    a knee joint connecting the thigh portion and the lower leg portion so that a knee angle is formed between the thigh portion and the lower leg portion;

    said knee joint comprising a damping element for controlling the knee joint movement, angle detection means for detecting the knee angle and force detection means for detecting a force acting on the prosthesis;

    a control unit for controlling said damping element as a function of the detected values of said knee angle and said force; and

    an adjusting device;

    wherein the control unit is structured and arranged to control said damping element as a function of control parameters (P) previously stored for different gait velocities; and

    the adjustment device is structured and arranged to select a control parameter (P) from said previously stored control parameters as a function of the type of gait and the detected values of said knee angle and said force, to change the selected control parameter (P) to a value (P′

    ) equal to or different from the previously stored value as a function of the type of gait and the detected values of said knee angle and said force, to store the changed control parameter (P′

    ) instead of the selected control parameter (P), and to use the changed control parameter (P′

    ) as a starting point in a subsequent step.

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