Self-centering, anti-seizing acetabular liner

Patent metadata

Field	Value
Publication number	US-10105230-B2
Application number	US-201715416014-A
Country	US
Kind code	B2
Filing date	Jan 26, 2017
Priority date	Sep 30, 2011
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

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.

First claim

The invention claimed is:

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.

Assignees

• Depuy Synthes Products Inc

Inventors

• Armacost John M
• Caywood James A
• Keefer Ryan C

Classifications

• A61F2002/3053

  having additional means for preventing unwanted connections · CPC title

• A61F2002/30657

  made of different partially-spherical concave portions · CPC title

• A61F2002/305

  Snap connection · CPC title

• A61F2/34 Primary

  Acetabular cups · CPC title

• A61F2002/3429

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