Multiple Bearing Acetabular Prosthesis

• US 20100131073A1
• Filed: 11/23/2009
• Published: 05/27/2010
• Est. Priority Date: 11/24/2008
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Meridew, Jason D., Hershberger, Troy W.
• Granted Patent: US 8,123,815 B2
• Time in Patent Office: Days
• US Class Current: 623/22.280
• CPC Class Codes: A61F 2/34 Acetabular cups
• 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 2002/3054 about a connection axis or implantation axis for selecting any one of a plurality of radial orientations between two modular parts, e.g. Morse taper connections, at discrete positions, angular positions or continuous positions
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30607 Kits of prosthetic parts to be assembled in various combinations for forming different prostheses
• CPC Class Codes: A61F 2002/3403 Polar aperture
• CPC Class Codes: A61F 2002/3414 Polar protrusion, e.g. for centering two concentric shells
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2250/0062 Kits of prosthetic parts to be assembled in various combinations for forming different prostheses

Abstract

A prosthesis to replace a portion of the anatomy, such as the acetabulum, can include a first portion. A second prosthesis portion can be positioned relative to the shell to provide the bearing surface to articulate with a femoral head prosthesis or femoral head. The second prosthesis portion can include a connection portion to engage a connection portion in the shell.

Claims

1. An acetabular implant kit for positioning in an anatomy, the kit comprising:

a shell having,

a shell wall that extends from a proximal apex portion to a distal rim defining a passage operable to receive a liner, wherein the shell wall has an internal shell wall surface defining an internal void and an external shell wall surface operable to engage the anatomy;

an anti-rotation mechanism formed by the distal rim of the shell;

a taper connection mechanism formed by the internal shell wall surface in the shell near the distal rim; and

a shell groove spaced apart from the taper connection and formed in an apical bore defined by an apical wall extending from the internal shell wall surface towards the external shell wall surface near the proximal apex portion, wherein the shell groove formed in the apical bore is at a position in the apical bore between the internal shell surface and the external shell wall surface;

a first liner having a first liner wall extending from a first liner distal rim, a complementary taper formed by a first liner external surface near the first liner distal rim and operable to engage the taper connection mechanism, wherein when the complementary taper connection is engaged with the taper connection mechanism at least a portion of the first liner external surface does not contact the internal shell wall surface;

a second liner having a second liner wall extending from a second liner proximal apex, a second liner projection portion extending outward from an external wall surface at the second liner proximal apex of the second liner, a second liner groove formed in the second liner projection portion operable to cooperate with the shell groove; and

an annular connecting member separate from the shell and the second liner, wherein the annular connecting member includes an opening to allow for a deformation of the annular connecting member as the second liner projection portion is moved into the apical bore of the shell;

wherein the second liner projection portion is operable to be received in the apical bore;

wherein the connecting member undeforms to seat in both the shell groove formed in the apical bore and the second liner groove formed in the second liner projection portion when the second liner projection portion is positioned within the apical bore;

wherein either the first liner or the second liner are operable to be positioned within the shell and both the first liner and the second liner are axially inserted into the shell without need for rotating the first liner, the second liner, or the shell;

wherein the first liner has a first rigidity and the second liner has a second rigidity less than the first rigidity.