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US 4,044,403 AGranted
Implantable joint prosthesis
AssigneeHowmedica, Inc.
InventorJoseph D'Errico
Life of this patent
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AssigneeHowmedica, Inc.
InventorJoseph D'Errico
Estimating the term…
An articulating joint prosthesis comprising implantable first and second members, said first member having a substantially spherical head, said second member having substantially congruent cavity formed therein for cooperatively engaging said spherical head, said cavity having a hemispherical portion terminating in a diametral plane and an entrance portion extending beyond said plane and terminating in a circular entrance to said cavity, an outwardly tapering guideway surrounding said entrance, said second member further having a continuous annular groove formed substantially at said diametral plane and adjacent said guideway, said guideway and said groove defining between them a resilient annular lip surrounding said entrance, said lip being inwardly deformable during insertion of said spherical head through said entrance to admit and entrap said head in said cavity, and said lip being outwardly deformable to resist escape of said head from said cavity.
An articulating joint prosthesis comprising implantable first and second members, said first member having a substantially spherical head, said second member having a substantially congruent cavity formed therein for cooperatively engaging said spherical head, said cavity having a hemispherical portion terminating in a diametral plane and an entrance portion extending beyond said plane and terminating in a circular entrance to said cavity, and outwardly tapering guideway surrounding said entrance, said second member further having a continuous annular groove formed substantially at said diametral plane and adjacent said guideway, said guideway and said groove defining between them a resilient annular lip surrounding said entrance, said lip being inwardly deformable during insertion of said spherical head through said entrance to admit and entrap said head in said cavity, and said lip being outwardly deformable to resist escape of said head from said cavity.
An implantable component for cooperatively engaging an implantable prosthetic member having a substantially spherical head to form an articulating joint prosthesis, said component having a substantially congruent cavity formed therein for cooperatively engaging said spherical head, said cavity having hemispherical portion terminating in a diametral plane and an entrance portion extending beyond said plane and terminating in a circular entrance to said cavity, an outwardly tapering guideway surrounding said entrance, said component further having a continuous annular groove formed substantially at said diametral plane and adjacent said guideway, said guideway and said groove defining between them a resilient annular lip surrounding said entrance, said lip being inwardly deformable during insertion of said spherical head through said entrance to admit and entrap said head in said cavity, and said lip being outwardly deformable to resist escape of said head from said cavity.
Dependencies are inferred from the claim text.