US4044403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Implantable joint prosthesis
Assignee: MTG Divestitures LLC
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Filing: 1976-11-01
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Granted: 1977-08-30
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Expires: 1996-11-01
Abstract
Abstract 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.
Inventors
- 👤 Joseph D'Errico
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:58
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/40; A61F2/36; A61F2/3609; A61F2002/30001; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30332; A61F2002/30349; A61F2002/3208; A61F2002/3233; A61F2/34; A61F2002/3429; A61F2002/3435; A61F2002/3437; A61F2002/3625; A61F2002/3631; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00029
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
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.
Claim 2
Dependent Claim
141 words
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.
Claim 3
Dependent Claim
38 words
A hip joint prosthesis comprising the prosthesis of claim 1 wherein said first member is provided with means for implanting in the femur and said second member has a substantially spherical outer surface for implanting in the acetabulum.
Claim 4
Dependent Claim
23 words
The prosthesis of claim 2 wherein said second component is formed from a resilient low friction polymer encased in a metallic outer shell.
Claim 5
Dependent Claim
24 words
The prosthesis of claim 3 wherein said polymer is ultrahigh molecular weight polyethylene and said shell has a generally smooth, unbroken and spherical conformation.
Claim 6
Dependent Claim
141 words
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.
Claim 7
Dependent Claim
141 words
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.
Claim 8
Dependent Claim
22 words
The component of claim 5 wherein the walls of said annular groove are substantially parallel to the wall of said tapered guideway.
Claim 9
Dependent Claim
12 words
The component of claim 5 formed from a resilient low friction polymer.
Claim 10
Dependent Claim
23 words
The component of claim 7 wherein said polymer is ultrahigh molecular weight polyethylene and said component is encased in a metallic outer shell.
Claim 11
Dependent Claim
16 words
The component of claim 8 wherein said shell has a generally smooth, unbroken and spherical conformation.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |