Carolina Avila Carrasco,Simon Nicholas Collins,Andrew Clive Taylor,Michael Anthony Tuke
申请号：
GB201707434
公开号：
GB2562256A
申请日:
2017.05.09
申请国别(地区):
GB
年份:
2018
代理人:
摘要：
A ceramic acetabular cup 10, devoid of a separate liner, comprises an inner articulating surface 12, an outer surface (14, Fig 1) and a rim (22, Fig 1). The distance 38 between the articulating surface and outer surface on a straight line from an equatorial centre of the articulating surface E and passing through a surface edge of it is equal to or less than 4 mm. In a first embodiment an inner radius of the articulating surface defines an active arc A (over which an in use femoral head can articulate) and an uppermost portion of the rim defines an offset datum plane D. An offset O between an equatorial centre E of the articulating surface and the offset datum plane D is in a range of around 1 mm towards a pole 24 of the inner articulating surface and around 3.5 mm away it. The active arc A extends in a range from around 150 degrees to less than 180 degrees. In a second embodiment the distance is measured where the straight line from the equatorial centre E passes through a surface edge of the inner articulating surface at the transition to the rim. A method of selecting a wall thickness for an acetabular cup is also included.
