| 摘要 |
A prosthetic joint includes an anterior linking and support member and a posterior linking and support member, formed of a resilient material, which act as cantilever flat springs to provide an intrinsic extension bias while furnishing the rigid structure necessary to support the axial loads and extension moments induced by the amputee. A prosthetic knee joint includes a base formed of a resilient polyamide such as nylon 6/6, from which an anterior linking and support member, generally of an L-shape, and a posterior linking and support member, monolithically extend upwards. Formed to provide the inherent stability of four-bar linkage, these resilient linking and support members are pivotally attached to a yoke member to act as cantilever single-leaf flat springs which provide an intrinsic extension moment to the prosthetic knee joint which may vary according to the amount of flexion of the knee joint. The extension moment of the knee joint is translated into compression at the anterior linking and support member and tension at the posterior linking and support member, thereby allowing the use of a relatively low-strength resilient material in the knee joint construction. A common double-acting hydraulic damper is used to reduce the swing rate of the knee joint, permitting a desired gait and reducing terminal impact at full extension.
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