Patent ID: 8500823
Filing Date: 2013-08-06
Classification: A61F,B62D

Abstract:
1. A powered artificial knee comprising, in combination: a knee joint, the knee joint being rotatable and coupleable to a first artificial upper leg member and a second artificial lower leg member; an agonist-antagonist actuator, comprising at least one sensor configured to provide feedback to the controller; wherein: during Early Stance, during Pre-Swing, during Swing, when the knee extends and has an angle of less than the knee joint angle maximum threshold, the extension equilibrium angle tracks the knee joint angle under zero load, a low gain damping control on the flexion motor shaft causes the flexion motor to act as a variable damper to decelerate the second artificial lower leg member until the flexion equilibrium angle is at a flexion equilibrium angle minimum threshold, and the extension equilibrium angle is set to an extension equilibrium angle minimum threshold in preparation for a subsequent gait cycle.