Bone and joint prosthesis
AssigneeHowmedica, Inc.
InventorJohn Anthony Crep
Life of this patent
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Abstract
This application describes a shoulder prosthesis having a metal humeral cup component with an extending stem for insertion into the intramedullary canal of the humerus bone. The shoulder or intracancellous component has a ball embraced within the cup between a pair of ultra high molecular weight polyethylene lining inserts, which are locked within the cup under a strong resilient plastic lock ring, which snaps into a circular groove about the rim of the cup. The mouth of the cup and lock ring have mutually engaging bevelled surfaces. The ball and attached scapular component freely pivot or articulate within the cup and lining inserts.
Claims14
A prosthetic device comprising a cup-shaped component having a cup, fixation stem means extending from the base of the cup-shaped portion for attaching it to a boney portion of the body, a ball component, fixation rod means connected to the ball component for connecting it to another boney portion of the body, a split lining insert means having outer dimensions contructed and arranged for engagement within the cup, the split lining insert means having an inner cavity constructed and arranged for reentrantly embracing the ball, an internally flanged locking ring for engaging the outer rim of the cup, the internally flanged locking ring having an aperture through which the ball component is freely inserted, a circular groove above the rim of the cup for snugly receiving the internal flange of the locking ring, and a retaining shoulder within the locking ring for retaining the insert liners and ball within the cup.
Dependencies are inferred from the claim text.