Patent ID: 8444705

Claim:
A knee joint prosthesis adapted for interconnecting a prosthetic lower leg and a prosthetic thigh, said knee joint prosthesis comprising: a knee seat adapted to be disposed under and connected to the prosthetic thigh; a connecting seat adapted to be disposed above and connected to the prosthetic lower leg; a link assembly including a plurality of links each connected pivotally to said knee seat and said connecting seat in such a manner to allow said knee joint prosthesis to change between an elevated position and a flexed position; and an adjusting unit disposed in said knee seat and operable to cooperate with said link assembly to adjust difficulty level of changing said knee joint prosthesis between the elevated and flexed positions; wherein: said knee seat includes a seat body adapted to be connected to the prosthetic thigh, and two parallel arms extending rearwardly and downwardly from said seat body and spaced apart from each other in a left-to-right direction; and said links of said link assembly include two front links each having upper ends connected respectively and pivotally to upper end portions of said arms of said knee seat, and lower ends connected pivotally to said connecting seat, and a rear link having a connecting wall and two side walls extending respectively from two opposite sides of said connecting wall and disposed between said arms, said side walls having upper ends disposed between said arms and connected respectively and pivotally lower end portions of said arms.