Patent ID: 8974543
Filing Date: 2015-03-10
Classification: A61F

Abstract:
1. A prosthesis for above-knee amputees, said prosthesis having a femoral segment, which can be fixed to a femoral connection, and a tibial segment pivotally connected to each other about an articulation axis that reproduces the knee movements, said tibial segment being articulated by an ankle to a foot having toes, a sole of the foot and a heel, wherein said knee movements comprise a swing phase, between bringing the toes off the ground and landing the heel, and a stance phase, comprising landing the heel, loading the sole of the foot and bringing the toes off the ground, a hydraulic damper being provided having respectively an upper hinge and a lower hinge connected respectively with said femoral segment and said tibial segment and damping the relative movement of said tibial segment with respect to said femoral segment, so that in the stance phase, the tibial segment is braked with respect to the knee articulation between said femoral segment and said tibial segment, wherein the hydraulic damper comprises a cylinder-piston and a stem connected to said piston, and a microprocessor is provided for adjusting the damping reaction of said damper; wherein said damper is of hydraulic type and comprises blades arranged as check valve blade springs for opening an oil flow responsive to a speed of said stem in said cylinder.