Multiple bearing humeral prosthesis

Patent metadata

Field	Value
Publication number	US-9844439-B2
Application number	US-201514799710-A
Country	US
Kind code	B2
Filing date	Jul 15, 2015
Priority date	Oct 5, 2011
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

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

First claim

What is claimed is:

1. A humeral implant system comprising:
a shell having:
a shell wall that extends from a distal apex portion to a distal rim defining a passage operable to receive a bearing, wherein the shell wall has an internal shell wall surface defining an internal void having a concave spherical shape and an external shell wall surface operable to engage the humerus,
a coupling stem configured to be coupled to the shell, and
a snap-ring connection mechanism formed in the shell near the distal rim;

a first bearing defining a concave bearing surface and a first bearing wall extending from a first bearing distal rim, the first bearing wall defining a second snap-ring connection mechanism and a convex spherical shape complementary to the concave spherical shape of the internal shell wall surface; and
a second bearing defining a convex articulating bearing surface and a second bearing wall extending from a second bearing distal apex, the second bearing wall having a convex spherical shape complementary to the concave spherical shape of the internal shell wall surface, a third snap-ring connection disposed between the convex articulating bearing surface and the second bearing wall.

2. The humeral implant system of claim 1 , wherein the snap-ring connection mechanism of the shell includes a groove formed in the shell wall at a position between the internal shell wall surface and the external shell wall surface.

3. The humeral implant system of claim 2 , further comprising a connecting member separate from the shell and the second bearing.

4. The humeral implant system of claim 2 , wherein the shell includes a ledge that projects into the internal void from the shell wall between the internal shell wall surface and the external shell wall surface.

5. The humeral implant system of claim 4 , wherein the second bearing includes a second bearing ledge extending from the second bearing wall.

6. The humeral implant system of claim 1 , wherein the stem comprises a stem coupling taper.

7. The humeral implant system, of claim 1 , wherein the snap-ring connection mechanism comprises a plurality of ring bearing surfaces.

8. The humeral implant system of claim 1 , wherein the first bearing has a first rigidity and the second bearing has a second rigidity greater than the first rigidity.

9. The humeral implant system of claim 1 , wherein the second bearing further comprises a metallic exterior sleeve coupled to the second bearing wall.

10. The humeral implant system of claim 1 , wherein the first bearing further comprises a metallic sleeve coupled to the concave bead ng surface.

11. The humeral implant system of claim 1 , wherein the convex articulating bearing surface of the second bearing has a first radius of curvature and the second bearing wall has a second radius of curvature that is less than the first radius of curvature.

12. A humeral implant system, comprising:
a shell defining a concave surface and a first groove proximate a shell distal rim of the shell, the concave surface defining a void;
a coupling stem configured to be coupled to the shell;
a first bearing defining a concave bearing surface and a first bearing wall extending from a first bearing distal rim, the first bearing wall defining a second groove proximate the first bearing distal rim, the first bearing wall having a convex spherical shape complementary to the concave surface defining the void;
a second bearing defining:
a convex articulating bearing surface,
a second bearing wall extending from a second bearing distal apex, the second bearing wall having a convex spherical shape complementary to the concave surface defining the void, and
a third groove disposed between the convex articulating bearing surface and the second bearing wall; and
a snap ring configured to couple either the first bearing or the second bearing to the shell via the first groove and either the second groove or third groove, respectively.

13. The humeral implant system of claim 12 , further comprising a stem configured to couple to the shell via a taper connection.

14. The humeral implant system of claim 12 , wherein the second bearing further comprises a metallic exterior sleeve coupled to the second bearing wall.

15. The humeral implant system of claim 12 , wherein the first bearing further comprises a metallic sleeve coupled to the concave bearing surface.

16. The humeral implant system of claim 12 , wherein the first hearing has a first rigidity and the second bearing has a second rigidity greater than the first rigidity.

17. A humeral implant system, comprising:
a shell defining a concave spherical surface and a first groove proximate a shell distal rim of the shell, the concave surface defining a void;
a coupling stem configured to be coupled to the shell;
a first bearing defining a concave bearing surface and a first bearing wall extending from a first bearing distal rim, the first bearing wall defining a second groove proximate the first bearing distal rim, the first bearing wall having a convex spherical shape complementary to the concave surface defining the void; and
a second bearing defining:
a convex articulating bearing surface,
a second bearing wall extending from a second bearing distal apex, the second bearing wall having a convex spherical shape complementary to the concave surface defining the void,
a third groove disposed between the convex articulating bearing surface and the second bearing wall, wherein when the second bearing is attached to the shell, a space is formed between the concave surface defining the void and the second bearing wall; and
a snap ring configured to couple either the first bearing or the second bearing to the shell via the first groove and either the second groove or third groove, respectively.

18. The humeral implant system of claim 17 , wherein the shell includes a ledge that projects into the internal void from the shell wall between the internal shell wall surface and the external shell wall surface.

19. The humeral implant system of claim 17 , wherein the second bearing further comprises a metallic exterior sleeve coupled to the second bearing wall.

20. The humeral implant system of claim 17 , wherein the first bearing further comprises a metallic sleeve coupled to the concave bearing surface.

Assignees

• Biomet Mfg Llc

Inventors

• Katrana Nicholas J
• Winslow Nathan A

Classifications

• A61F2002/30495

  using a locking ring · CPC title

• A61F2002/30507

  using a threaded locking member, e.g. a locking screw or a set screw · CPC title

• A61F2002/4037

  Connections of heads to necks · CPC title

• A61F2002/4022

  having a concave shape, e.g. hemispherical cups · CPC title

• F04C2270/041

  Controlled or regulated · CPC title