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Acetabular cup positioning apparatus

  • US 4,632,111 A
  • Filed: 03/21/1985
  • Issued: 12/30/1986
  • Est. Priority Date: 03/21/1985
  • Status: Expired due to Term
First Claim
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1. Apparatus suitable for positioning a prosthetic acetabular cup within an acetabulum, said cup having a recessed surface dimensioned to mate with a prosthetic femoral head, said apparatus comprising:

  • A. a pusher ball, for pressing the acetabular cup into the acetabulum, said pusher ball including an outer surface adapted to generally mate with said recessed surface of said acetabular cup;

    B. a pusher arm including;

    (1) a first end portion affixed to said pusher ball;

    (2) an intermediate straight portion; and

    (3) a second end portion opposite said first end portion;

    C. a positioner flange having first and second major opposite surfaces;

    D. a positioner arm including;

    (1) a first end portion affixed to said flange;

    (2) an intermediate straight portion; and

    (3) a second end portion opposite said first end portion; and

    E. means for removably engaging said flange with said intermediate straight portion of said pusher arm to face said first major surface of said flange with said pusher ball along said intermediate straight portion of said pusher arm, said removable engaging means comprising an edge surface connecting said first and second major surfaces of said flange and a portion of said edge surface extending from a first location on the periphery of said major surfaces generally to the center of said major surfaces and back to a second location on the periphery of said major surfaces to define a slot dimensioned to receive a part of said intermediate portion of said pusher arm; and

    F. adjustable means for releasably affixing;

    (1) said flange faced with said pusher ball to define a predetermined angle between said intermediate straight portions of said pusher arm and said positioner arm; and

    (2) said outer surface of said pusher ball generally mated with said recessed surface of said acetabular cup, so that said positioner flange and said positioner arm can be released and removed from said intermediate straight portion of said pusher arm while said pusher ball remains mated with said recessed surface of said acetabular cup to maintain uninterrupted pressure on said acetabular cup.

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