# US 8,771,367 B2 · Self centering, anti-seizing acetabular liner

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- Number: US 8,771,367 B2
- Document ID: US8771367B2
- Status: Granted
- Kind: B2
- Application number: 13/623,158
- Filed: 2012-09-20
- Published: 2013-04-04
- Granted: 2014-07-08
- Earliest claimed: 2011-09-30
- Assignees: DePuy Synthes Products, Inc.
- Applicants: John M Armacost; James A Caywood; Ryan C Keefer
- Inventors: John M Armacost; James A Caywood; Ryan C Keefer
- Web page: https://patentgrep.com/patent/US8771367B2

## CPC

- A61F 2/34: Acetabular cups
- A61F 2002/30112: {Rounded shapes, e.g. with rounded corners}
- A61F 2002/30332: {Conically- or frustoconically-shaped protrusion and recess}
- A61F 2002/305: {Snap connection}
- A61F 2002/3053: {having additional means for preventing unwanted connections}
- A61F 2002/30657: {made of different partially-spherical concave portions}
- A61F 2002/3241: {having a ring, e.g. for locking the femoral head into the acetabular cup}
- A61F 2002/3429: {with an integral peripheral collar or flange, e.g. oriented away from the shell centre line}
- A61F 2002/3459: {made of different partially-spherical portions}
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## 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

### Claim 1

A kit for use in hip arthroplasty comprising:
an acetabular shell; and
an acetabular liner adapted for insertion into said acetabular shell, the liner comprising:
a concave inner surface adapted to engage a femoral head;
an outer 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 or sharp point exists on the outer surface of the acetabular liner.

### Claim 2 (depends on 1)

The kit of claim 1, wherein the shell includes a locking section adapted to engage the locking section of the liner.

### Claim 3 (depends on 2)

The kit of claim 2, wherein the shell locking section and the liner locking section are self-locking tapers.

### Claim 4 (depends on 1)

The kit of claim 1, wherein the dome section includes a flattened top portion.