.The four link knee joint is a kind of multi axis knee joint. Its
motion law is similar to that of
physiological knee joint, and its movement center varies with the
knee joint flexion degree.
.The support stability of the prosthesis is good, the sagittal,
frontal and horizontal surfaces, and
the extension resistance can be adjusted
.The pneumatic control device ensures the stability of the knee
joint as well as the high efficiency
of the swing phase
.Pneumatic swing control functions to ensure amputees at walking
speed under different gait can
achieve the natural harmony of the pneumatic cylinder, can It
differs from man to man..