Patent ID: 6508843
Filing Date: 2003-01-21
Classification: A61F

Abstract:
A knee joint structure of an artificial limb having a five-joint link mechanism, including five-joint links that consists of an upper link to which a thigh support part of an artificial limb is fixed; a lower link with which a foot part of the artificial limb is connected; a rear link connecting the upper link and the lower link with each other; a main frontal link linked with a front of the upper link, and an auxiliary frontal link connecting the main frontal link and the lower link with each other, said structure comprising:a first stopper for inhibiting an angle formed by said upper link and main frontal link from being increased to a predetermined angle or more; a second stopper for inhibiting an angle formed by the auxiliary frontal link and the lower link from being increased to a predetermined angle or more; and an elastic element inserted to be sandwiched between the auxiliary frontal link and the lower link, the elastic element acting to increase an angle formed by both of the links, wherein a length of said each link is set in such a manner that a cross point between an extension line of said main frontal link and that of a rear link is positioned upward of said each link, and a cross point between an extension line of said auxiliary frontal link and that of the rear link is positioned downward of said each link.