Cement spacer for acetabular cup
AssigneeBenoist Girard SAS
InventorsFranck Le Bon, Alain Richard, Jean-Pierre Brée, Philippe Lavieille
Life of this patent
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Abstract
An acetabular cup has a shell having a recess therein, the recess is open to an outer surface of the shell. The recess has an enlarged portion spaced from the shell outer surface with a diameter greater than the diameter of the opening at the surface. An insert is provided for insertion into the recess in the shell outer surface. The insert has a height greater than a depth of the recess and has a solid portion and a bifurcated portion having at least two side openings forming two to four sectors. A base of the sectors formed by bifurcated portion has an outwardly extending flange for insertion into the enlarged portion of the recess.
Claims21
An acetabular cup for cemented implantation in an acetabulum comprising:
- a shell having a recess with a bottom surface therein forming an opening open to an outer surface of the shell and having an enlarged portion spaced from the outer surface having a diameter greater than the diameter of the opening and including the bottom surface;
- and
- an insert for insertion into the recess in the outer shell to be held loosely therein, the insert having a height greater than a depth of the recess and having a solid portion and a bifurcated portion having at least two side openings, a base of the bifurcated portion having an outwardly extending flange for insertion into the enlarged portion of the recess the base of the bifurcated portion including a plurality of spacers contacting the bottom surface to form a gap between the base of the bifurcated portion and the recess bottom surface for ingress of bone cement.
An acetabular cup comprising:
- a shell having an outwardly facing surface including at least three stepped coupling recesses thereon, the coupling recesses each having a first portion with a first diameter and a second portion with a second smaller diameter forming a recessed step therebetween and a bottom surface;
- and
- an insert having a solid portion and a bifurcated portion and dimensioned to loosely fit in the recesses surrounded by a clearance gap, the bifurcated portion having at least two arms each having a flange for insertion into the recessed step the arms having a base with a protrusion contacting the bottom surface of the recess forming a gap therebetween for ingress of bone cement.
An acetabular cup adapted to be held in place in a receptive opening in an acetabulum by cement, comprising an outer surface provided with a plurality of recesses each having a projecting spacer having an outer surface located to space said outer cup surface away from a surface of said receptive opening and in which said spacers are loosely carried in the recesses in the outer surface of said cup with a surrounding clearance gap to allow loose relative movement of the spacer in the recess in all directions, the spacer having a bottom surface with a protrusion with the protrusion forming a gap between the spacer bottom surface and a bottom surface of the recess for ingress of bone cement.
Dependencies are inferred from the claim text.