| 摘要 |
<p>This invention is a knee mechanism for lower limb prosthesis which maintains knee stability over an initial range of flexion and includes an upper member (1) for connection to or forming part of the thigh component of a prosthesis, a lower member (2) for connection to or forming part of the shin component of a prosthesis, and a slider (3) and a crank (5) connecting the upper member (1) to the lower member (2). The locus of the instantaneous center of rotation of the mechanism is a curve which commences above the knee and posterior to the load line and which, over an initial range of flexion of the mechanism, moves continuously downwards and to the posterior, the curve being convex towards the posterior. The lower members (2), the slider (3) and the crank (5) preferably constitute a slider crank mechanism with the crank (5) pivotally connected to the upper and lower members (1, 2) and the slider (3) pivotally connected to the lower member (2) and slidably connected to the upper member (1). At full extension the crank (5) is inclined posteriorly upwardly, with the pivotable connection with the upper member (1) located below the pivotable connection with the lower member (2). The slider is located in a tract (4) which forms part of the upper member (1) and may move with a rolling or sliding contact. The pivotal connection of the slider with the lower member (2) is located posterior to the pivotal connection with the crank (5).</p> |
