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    Mobile bearing knee with center post
    2.
    发明授权
    Mobile bearing knee with center post 有权
    带中心柱的移动轴承膝盖

    公开(公告)号：US06296666B1

    公开(公告)日：2001-10-02

    申请号：US09524386

    申请日：2000-03-13

    Applicant: Kenneth Jay Gardner

    Inventor： Kenneth Jay Gardner

    IPC: A61F238

    CPC classification number: A61F2/3868 ,  A61F2002/30112 ,  A61F2002/30133 ,  A61F2002/3014 ,  A61F2002/30355 ,  A61F2002/30365 ,  A61F2002/30369 ,  A61F2002/30487 ,  A61F2002/30502 ,  A61F2002/30878 ,  A61F2002/30884 ,  A61F2002/30892 ,  A61F2220/0025 ,  A61F2220/0033 ,  A61F2230/0004 ,  A61F2230/0015 ,  A61F2230/0017 ,  A61F2310/00011 ,  A61F2310/00179

    Abstract: A mobile bearing knee prosthesis in which the tibial component includes an upstanding post and a cap provided at an upper end thereof. The cap includes a lip extending laterally outward from the post to give the cap a generally oval shape with a major axis in the A/P direction and a minor axis in the M/L direction. The meniscal insert includes an undercut cavity elongated in the A/P direction in which the post is received. The undercut cavity has a length allowing substantial movement of the post therealong in the A/P direction, and a width allowing only a minor movement of the post in the M/L direction. The insert also includes an upper cutout extending around an upper portion of the cavity which receives therein an adjacent portion of the lip. With this construction, the insert and the baseplate are free to slide relative to one another along a plane of contact therebetween, except when constrained by (i) a contact of the post with the undercut cavity as movement occurs in the A/P and M/L directions, whereby substantial relative movement of the insert and baseplate in the A/P direction is allowed and only a minor relative movement in the M/L direction is allowed, and (ii) an engagement of the lip located between the minor axis and the major axis with the upper cutout as rotation occurs about an axis perpendicular to the plane of contact, whereby only some predetermined rotational relative movement is allowed.

    Abstract translation: 一种移动轴承膝关节假体，其中胫骨部件包括直立柱和设置在其上端的帽。 盖子包括从柱子横向向外延伸的唇缘，以使得盖子具有大致椭圆形的形状，其中A / P方向的长轴和M / L方向上的短轴。 半月板插入物包括在A / P方向上延伸的底切腔，其中接收柱。 底切腔的长度允许柱沿A / P方向大幅度移动，并且宽度仅允许柱在M / L方向上稍微移动。 插入件还包括围绕腔的上部延伸的上切口，其中容纳唇部的相邻部分。 通过这种结构，插入件和底板可以沿着它们之间的接触面相互自由地相对滑动，除了当（i）当A / P和M中的移动发生时， / L方向，从而允许插入件和基板在A / P方向上的实质相对运动，并且仅允许在M / L方向上进行较小的相对运动，并且（ii）位于短轴 并且具有上切口的长轴作为旋转发生在垂直于接触平面的轴线上，从而仅允许一些预定的旋转相对运动。

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