Apparatus and method for installing an acetabular liner on an acetabular cup

Patent metadata

Field	Value
Publication number	US-12042389-B2
Application number	US-202117246106-A
Country	US
Kind code	B2
Filing date	Apr 30, 2021
Priority date	Apr 30, 2021
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

An acetabular prosthesis assembly includes an acetabular shell component and an acetabular bearing component. The shell component includes a concave inner wall having a tapered surface with multiple anti-rotation slots defined therein. The bearing component includes a convex outer wall as well as an annular flange and multiple anti-rotation keys extending radially outward from the outer wall. When the anti-rotation keys are positioned in rotational alignment with the anti-rotation slots, the flange of the bearing component is positioned in contact with the tapered surface of the shell component. When the anti-rotation keys are positioned out of rotational alignment with the anti-rotation slots, the flange is spaced apart from the tapered surface. Methods for assembling and using the acetabular prosthesis assembly are also disclosed.

First claim

The invention claimed is:

1. An acetabular prosthesis assembly comprising:
an acetabular shell component configured to be implanted in a surgically-prepared acetabulum of a patient, the acetabular shell component comprising an annular rim and a concave inner wall extending medially from the annular rim, the concave inner wall having a tapered surface with a plurality of anti-rotation slots defined therein; and
a polymeric acetabular bearing component configured to be received by the acetabular shell component, the acetabular bearing component comprising (i) an annular rim, (ii) a convex outer wall extending medially from the annular rim to an apex, (iii) an annular flange extending radially outward from the outer wall, and (iv) a plurality of anti-rotation keys extending radially outward from the outer wall, wherein the plurality of anti-rotation keys are spaced evenly around the annular rim of the acetabular bearing component;
wherein: (i) when the plurality of anti-rotation keys are positioned in rotational alignment with the plurality of anti-rotation slots, the flange of the acetabular bearing component is positioned in contact with the tapered surface of the acetabular shell component, and (ii) when the plurality of anti-rotation keys are positioned out of rotational alignment with the plurality of anti-rotation slots, the flange of the acetabular bearing component is spaced apart from the tapered surface of the acetabular shell component; and
wherein the outer wall of the acetabular bearing component comprises a tapered surface extending medially from the annular rim to a curved relief surface positioned between the tapered surface and the flange, wherein the tapered surface, when viewed in a cross-sectional plane taken in an anterior-posterior direction, defines a first imaginary line that extends along the tapered surface and the curved relief surface extends radially inward relative to the first imaginary line from the tapered surface and the flange.

2. The acetabular prosthesis assembly of claim 1 , wherein when the plurality of anti-rotation keys are positioned out of rotational alignment with the plurality of anti-rotation slots, a medial surface of each of the plurality of anti-rotation keys is positioned in contact with the annular rim of the acetabular shell component.

3. The acetabular prosthesis assembly of claim 2 , wherein when the plurality of anti-rotation keys are positioned in rotational alignment with the plurality of anti-rotation slots, the medial surface of each of the plurality of anti-rotation keys is positioned within a corresponding anti-rotation slot of the plurality of anti-rotation slots.

4. The acetabular prosthesis assembly of claim 3 , wherein when the plurality of anti-rotation keys are positioned in rotational alignment with the plurality of anti-rotation slots, the medial surface of each of the plurality of anti-rotation keys is positioned medially by a predetermined distance from the annular rim of the acetabular shell component.

5. The acetabular prosthesis assembly of claim 4 , wherein the predetermined distance comprises 0.5 millimeters.

6. The acetabular prosthesis assembly of claim 1 , wherein when the plurality of anti-rotation keys are positioned in rotational alignment with the plurality of anti-rotation slots and the acetabular bearing component is fully installed in the acetabular shell component, each of the plurality of anti-rotation keys is positioned within a corresponding anti-rotation slot of the plurality of anti-rotation slots.

7. The acetabular prosthesis assembly of claim 6 , wherein when the plurality of anti-rotation keys are positioned in rotational alignment with the plurality of anti-rotation slots and the acetabular bearing component is fully installed in the acetabular shell component, the flange is received in an annular groove defined in the concave inner wall of the acetabular shell component.

8. The acetabular prosthesis assembly of claim 1 , wherein the plurality of anti-rotation keys extend radially outward from the tapered surface.

9. The acetabular prosthesis assembly of claim 1 , wherein:
the tapered surface of the acetabular shell component defines a taper angle; and
the flange of the acetabular bearing component comprises a flange surface that defines a flange angle, wherein the flange angle is greater than or equal to the taper angle.

10. The acetabular prosthesis assembly of claim 9 , wherein the taper angle is 10° and the flange angle is between 10-14°.

11. The acetabular prosthesis assembly of claim 10 , wherein the flange angle is 12°.

12. A method for installing an acetabular prosthesis, the method comprising:
implanting an acetabular shell component into a surgically-prepared acetabulum of a patient, wherein the acetabular shell component comprises an annular rim and a concave inner wall extending medially from the annular rim, the concave inner wall having a tapered surface with a plurality of anti-rotation slots defined therein;
moving an acetabular bearing component into contact with the implanted acetabular shell component, wherein the acetabular bearing component comprises (i) an annular rim, (ii) a convex outer wall extending medially from the annular rim to an apex, (iii) an annular flange extending radially outward from the outer wall, and (iv) a plurality of anti-rotation keys extending radially outward from the outer wall, wherein the plurality of anti-rotation keys are spaced evenly around the annular rim of the acetabular bearing component; and
rotating the acetabular bearing component relative to the implanted acetabular shell component from a first position in which the plurality of anti-rotation keys are positioned out of rotational alignment with the plurality of anti-rotation slots to a second position in which the plurality of anti-rotation keys are positioned in rotational alignment with the plurality of anti-rotation slots, wherein when in the first position the flange of the acetabular bearing component is spaced apart from the tapered surface of the acetabular shell component, and when in the second position the flange of the acetabular bearing component is positioned in contact with the tapered surface of the acetabular shell component;
wherein the outer wall of the acetabular bearing component comprises a tapered surface extending medially from the annular rim to a curved relief surface positioned between the tapered surface and the flange, wherein the tapered surface, when viewed in a cross-sectional plane taken in an anterior-posterior direction, defines a first imaginary line that extends along the tapered surface and the curved relief surface extends radially inward relative to the first imaginary line from the tapered surface and the flange.

13. The method of claim 12 , further comprising impacting the acetabular bearing component into the implanted acetabular shell component once the acetabular bearing component is in the second position.

14. The method of claim 13 , wherein impacting the acetabular bearing component comprises deforming the flange of the acetabular bearing component.

15. The method of claim 14 , further comprising receiving the flange of the acetabular bearing component in an annular groove defined in the concave inner wall of the acetabular shell component.

16. The method of claim 15 , wherein receiving the flange in the annular groove comprises elastomerically relaxing the flange to its original shape.

17. The method of claim 15 , wherein receiving the flange in the annular groove comprises engaging a tapered surface of the acetabular bearing componen

Assignees

• Depuy Ireland Ultd Co

Inventors

• Brandewie Alena M
• Keefer Ryan C

Classifications

• A61F2/4609

  of acetabular cups · CPC title

• A61F2002/3429

  with an integral peripheral collar or flange, e.g. oriented away from the shell centre line · CPC title

• A61F2002/30428

  made by inserting a protrusion into a slot · CPC title

• A61F2002/4629

  connected to the endoprosthesis or implant via a threaded connection · CPC title

• A61F2002/3403

  Polar aperture · CPC title