Patent ID: 7344565

Claim:
An acetabular component and an insertion and extraction tool for use with the acetabular component, comprising an acetabular component comprising a partial spherical body having a peripheral surface circumscribing a cavity, a plurality of recesses along an outer surface of said body each having an entry portion along said peripheral surface leading into an engagement portion angled from said entry portion, each of said engagement portions having a first end aligned with said entry portion and a second end extending beyond said entry portion to define a shoulder between said second end and said peripheral surface; and an insertion and extraction tool comprising an outer sleeve having a distal end carrying a locking member including a plurality of radially extending arms and a locking finger extending distally from each of said arms, an inner shaft, slidably disposed in said outer sleeve and having a distal end carrying an engagement plate disposed distally of said distal end of said outer sleeve and having a plurality of engagement protrusions, each of said engagement protrusions including a leg extending distally from said engagement plate to a foot angled from said leg, said engagement plate having a plurality of channels therein slidably receiving said arms, respectively, and a spring biasing said outer sleeve and said shaft longitudinally to a locked position for said tool in which said locking member is in an extended position relative to said engagement plate wherein said locking fingers protrude distally beyond said engagement plate alongside said legs of said engagement protrusions, said tool being movable to an unlocked position in response to an actuating force applied to said tool to effect relative longitudinal movement of said outer sleeve and said shaft to move said locking member to a retracted position relative to said engagement plate wherein said locking fingers are retracted within said channels, said feet being insertable through said entry portions into said first ends of said engagement portions of said recesses with said tool in said unlocked position and being movable into said second ends of said engagement portions in response to rotation of said engagement plate about its central longitudinal axis, said shoulders preventing withdrawal of said engagement protrusions from said recesses in a longitudinal direction and said recesses presenting portions unoccupied by said engagement protrusions when said feet are moved into said second ends of said engagement portions, said tool being returned automatically to said locked position by said spring in response to removal of the actuating force to cause said locking fingers to enter said unoccupied portions and prevent rotation of said engagement plate about its central longitudinal axis whereby said acetabular component is locked to said tool.