3R90 Modular friction brake prosthetic knee joint

The load-dependent brake mechanism offers targeted safety for the patient. A heel load activates the brake and provides high stability in the stance phase. The swing phase can be controlled by means of a mechanical extension assist which, integrated in the lower section of the joint, has a progressively acting spring combination. The 3R90’s mechanical extension assist is formed by a combination of two spring elements. These interact to produce an extension assist effect which is proportionate to the knee angle and which can be easily preset to one of five different levels by means of a simple ratchet unit.