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US 9,844,439 B2Granted
Multiple bearing humeral prosthesis
AssigneeBiomet Manufacturing, LLC
InventorsNicholas J. Katrana, Nathan A. Winslow
Life of this patent
Estimating the term…
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.
Claims20
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.
4 more elements
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.
6 more elements
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.
7 more elements
Dependencies are inferred from the claim text.