Self-centering, anti-seizing acetabular liner

• US 8,968,414 B2
• Filed: 04/02/2014
• Issued: 03/03/2015
• Est. Priority Date: 09/30/2011
• Status: Active Grant

• Current Assignee: DePuy Synthes Products LLC (Johnson & Johnson)
• Original Assignee: DePuy Synthes Products LLC (Johnson & Johnson)
• Inventors: Armacost, John M., Caywood, James A., Keefer, Ryan C.
• Primary Examiner(s): Willse, David H
• Assistant Examiner(s): BLANCO, JAVIER G
• Application Number:
  US14/243,266
• Publication Number:
  US 20140214171A1
• Time in Patent Office: 335 Days
• Field of Search: 623/22.24, 623/22.28
• US Class Current: 623/22.28
• 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 liner adapted for insertion into an acetabular shell for use in hip arthroplasty. The liner includes a concave inner surface adapted to engage a femoral head. The liner also includes an outer surface adapted to engage the acetabular shell and a rim that extends between the inner surface and the outer surface. The outer surface includes a locking section extending from the rim, a composite-curved section extending from the locking section at a first transition point, and a dome section extending from the composite-curved section, wherein at the first transition point, the composite-curved section is tangential to the locking section.

Claims

1. A self-centering, anti-seizing acetabular liner adapted for insertion into an acetabular shell for use in hip arthroplasty, the liner comprising:

a concave inner bearing surface adapted to engage a femoral head;

an outer bearing surface adapted to engage the acetabular shell; and

a rim extending between the inner surface and the outer surface, wherein the outer surface includes a locking section extending from the rim, a composite-curved section extending from the locking section at a first transition point, and a dome section extending from the composite-curved section, wherein at the first transition point, the composite-curved section is tangential to the locking section,

wherein the composite-curved section includes a curved radial portion and a straight-line tangential portion, wherein the radial portion extends from the locking section at the first transition point, and wherein the tangential portion extends from the radial portion at a second transition point,

wherein the tangential portion is tangential to the radial portion at the second transition point,

wherein the dome section extends from the tangential portion at a third transition point, wherein the tangential portion is tangential to the dome section at the third transition point, and

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

2. The acetabular liner of claim 1, wherein the dome section includes a flattened top portion.