| 摘要 |
The invention relates to an artificial joint element ( 1 ) for use in one or more single joints in a system of joints that consists of a combination of several kinematically coupled single joints, (series connection), in particular for use in one or more human finger joints. Said element comprises an essentially concave joint shell ( 2 ) and an essentially convex joint head ( 3 ). The aim of the invention is to obtain displacement characteristics for the artificial joint element ( 1 ), resulting from the additional degrees of freedom that are produced by incongruence, that mimic the natural behavior in an optimal manner. To achieve this, the joint element ( 1, 6 ) comprises at least four degrees of freedom and when used in the metacarpophalangeal joint, five degrees of freedom. For this purpose, the concave joint shell ( 2 ) comprises a curved contact line running over its surface with a first radius (R) and the concave joint head ( 3 ) has a contact line that is also curved running over its surface with a different second radius (r), which is smaller than the radius (R) of the contact line of the joint shell ( 2 ). |
