Locking ring for an acetabular cup
    2.
    发明公开
    Locking ring for an acetabular cup 失效
    VerriegelungsringfürHüftgelenkpfanne。

    公开(公告)号:EP0611008A1

    公开(公告)日:1994-08-17

    申请号:EP94200355.9

    申请日:1994-02-10

    IPC分类号: A61F2/34 F16B21/18

    摘要: The metal lock ring (30) of the invention has an oblong exterior periphery which allows the ring to have a small "width" and a larger "height". The small "width" provides a strong locking mechanism on the poly liner (14) and the larger "height" allows the ring to remain secure within the groove (18) of the metal shell (12) prior to and during assembly of the polyethylene liner (14). The ring has a chamfer on its inside leading edges defining its width to facilitate assembly of the liner (14). In the preferred embodiment, the lock ring has a constant thickness such that the inner periphery and the outer periphery are oval.
    In an alternative embodiment, the metal lock ring (30) has a round inner diameter and a round outer diameter that are not concentric, thereby creating a thickening of the ring at one end (50). The shape of the alternative lock ring provides for substantial contact between the lock ring (30) and the poly liner (14) about the liner (14). The thickened area (50) of the ring (30) retains the ring (30) within the metal cup (12) prior to and during assembly of the poly liner (14). The thickened portion of the ring (30) may have scallops or notches (52) formed therein to increase the flexibility of the ring (30).

    摘要翻译: 本发明的金属锁定环(30)具有长圆形外周,其允许环具有小的“宽度”和较大的“高度”。 小的“宽度”在聚合衬套(14)上提供强大的锁定机构,并且较大的“高度”允许环在聚乙烯之前和组装期间保持固定在金属壳体(12)的凹槽(18)内 内衬(14)。 该环在其内部的前缘上具有限定其宽度的倒角以便于衬套(14)的组装。 在优选实施例中,锁定环具有恒定的厚度,使得内周和外周均为椭圆形。 在替代实施例中,金属锁定环(30)具有不同心的圆形内径和圆形外径,从而在一端(50)处形成环的增厚。 替代的锁定环的形状提供围绕衬套(14)的锁定环(30)和聚合衬套(14)之间的实质接触。 环(30)的加厚区域(50)在聚合衬里(14)组装之前和组装期间将环(30)保持在金属杯(12)内。 环(30)的加厚部分可以具有形成在其中的扇形或凹口(52),以增加环(30)的柔性。