Self-centering, anti-seizing acetabular liner

• US 10,105,230 B2
• Filed: 01/26/2017
• Issued: 10/23/2018
• Est. Priority Date: 09/30/2011
• Status: Active Grant

• Current Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Inventors: Armacost, John M, Caywood, James A, Keefer, Ryan C
• Primary Examiner(s): Willse, David H
• Assistant Examiner(s): Blanco, Javier
• Application Number:
  US15/416,014
• Publication Number:
  US 20170143496A1
• Time in Patent Office: 635 Days
• Field of Search: 623 2224, 623 2228
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2002/30112 Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/3053 having additional means for preventing unwanted connections
• CPC Class Codes: A61F 2002/30657 made of different partially-spherical concave portions
• CPC Class Codes: A61F 2002/3241 having a ring, e.g. for locking the femoral head into the acetabular cup
• CPC Class Codes: A61F 2002/3429 with an integral peripheral collar or flange, e.g. oriented away from the shell centre line
• CPC Class Codes: A61F 2002/3459 made of different partially-spherical portions

Abstract

A kit for use in arthroplasty. The kit including a shell which has a shell locking section. The kit further including a liner adapted to be inserted into the shell. The liner includes an inner surface and an outer surface, wherein the inner surface is generally concave. The outer surface is adapted to engage the shell, and includes a liner locking section and a curved section. The curved section has a radius. The shell locking section and the liner locking section are adapted to engage one another. The shell locking section and the liner locking section are self-locking tapers. The curved section extends tangentially from the liner locking section at a first transition point.

Claims

1. A kit for use in arthroplasty comprising:

an acetabular shell which has (i) an inner surface, (ii) an outer surface, and (iii) a shell locking section, and

an acetabular liner adapted to be inserted into the acetabular shell, the acetabular liner including (i) an inner bearing surface, (ii) an outer bearing surface, and (iii) a peripheral rim extending between the inner bearing surface and the outer bearing surface, wherein the inner bearing surface is generally concave and adapted to engage a femoral head, and the outer bearing surface is generally convex and adapted to engage the inner surface of the acetabular shell,

wherein the outer bearing surface of the acetabular liner includes a liner locking section extending from the peripheral rim, a composite-curved section extending from the liner locking section at a first transition point, and a curved dome section extending from the composite-curved section, wherein at the first transition point, the composite-curved section is tangential to the liner locking section;

wherein the composite-curved section includes a curved radial portion having a radius and a curved tangential portion having a radius, wherein the curved radial portion extends from the liner locking section at the first transition point, and wherein the curved tangential portion extends tangentially from the curved radial portion at a second transition point;

wherein the radius of the curved tangential portion is different from the radius of the curved radial portion;

wherein the dome section extends from the composite-curved section at a third transition point, and the dome section is tangential to the composite-curved section at the third transition point;

wherein the shell locking section and the liner locking section are self-locking tapers, and wherein the shell locking section is configured to mate with the liner locking section,

wherein there is continuity between the liner locking section and the curved radial portion, and continuity between the curved tangential portion and the dome section, so that no edge, corner, or sharp point exists on the entire outer surface of the acetabular liner, and

wherein the structure of the outer bearing surface of the acetabular liner is configured to prevent the occurrence of a cross-locked taper junction when inserted into an acetabular shell.