US4224699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cap-shaped endoprosthesis for a femoral head
Assignee: Sulzer AG
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Filing: 1978-05-23
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Granted: 1980-09-30
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Expires: 1998-05-23
Abstract
Abstract The cap-shaped endoprosthesis is formed of a cap-shaped shell and an anchoring pin which extends through a bore in the shell. In addition, the peripheral edge of the shell is provided with a plurality of apertures into which tissue may invade to aid in securing the shell to the femoral head. Where the shell and pin are made of different materials, a plastic member maintains the pin and shell out of contact with each other.
Inventors
- 👤 Bernhard G. Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:24
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3601; A61F2/3603; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61F2/30721; A61F2/30749; A61F2002/30001; A61F2002/30316; A61F2002/30329; A61F2002/30474; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/30784; A61F2002/30787; A61F2002/3079; A61F2002/30878; A61F2002/30879; A61F2002/30891; A61F2002/30894; A61F2/3609; A61F2002/3611; A61F2002/3613; A61F2002/3621; A61F2220/00; A61F2220/0008; A61F2220/0025; A61F2310/00; A61F2310/00005; A61F2310/00161; A61F2310/00179
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
A cap-shaped endoprosthesis for a femoral head, said endoprosthesis comprising: a cap-shaped hemispherical shell of bioceramic material defining a cavity for fitting over a femoral head, said shell having a bore extending centrally therethrough and a plurality of apertures distributed about a peripheral edge thereof for an invasion of tissue therein; a metal anchoring pin extending through said bore for anchoring said shell to a femoral head, said pin and said shell defining a shaped gap therebetween with narrowing sections at each end of said gap; and a plastic member disposed between said pin and said shell to maintain said pin and said shell out of contact with each other, said plastic member filling said gap and having thin-walled extensions in said narrowing sections.
Claim 2
Dependent Claim
124 words
A cap-shaped endoprosthesis for a femoral head, said endoprosthesis comprising: a cap-shaped hemispherical shell of bioceramic material defining a cavity for fitting over a femoral head, said shell having a bore extending centrally therethrough and a plurality of apertures distributed about a peripheral edge thereof for an invasion of tissue therein; a metal anchoring pin extending through said bore for anchoring said shell to a femoral head, said pin and said shell defining a shaped gap therebetween with narrowing sections at each end of said gap; and a plastic member disposed between said pin and said shell to maintain said pin and said shell out of contact with each other, said plastic member filling said gap and having thin-walled extensions in said narrowing sections.
Claim 3
Dependent Claim
28 words
A cap-shaped endoprosthesis as set forth in claim 1 wherein each aperture widens in trumpet-fashion at least inwardly towards said cavity from a central cross-section of shell thickness.
Claim 4
Dependent Claim
24 words
a cap-shaped endoprosthesis as set forth in claim 1 wherein said cavity is of regular polygonal shape in at least one circumferential portion thereof.
Claim 5
Dependent Claim
107 words
A cap-shaped endoprosthesis for a femoral head, said endoprosthesis comprising a cap-shaped shell of bioceramic material or pyrolytic carbon defining a cavity of regular polygonal shape in at least one circumferential portion thereof for fitting over a correspondingly shaped femoral head, said shell having a bore extending centrally therethrough and a plurality of apertures distributed about a peripheral edge thereof for an invasion of tissue therein, each said aperture widening in trumpet-fashion at least inwardly towards said cavity from a central cross-section of shell thickness; and a metal anchoring pin extending through said bore and having a screw thread for anchoring said shell to a femoral head.
Claim 6
Dependent Claim
107 words
A cap-shaped endoprosthesis for a femoral head, said endoprosthesis comprising a cap-shaped shell of bioceramic material or pyrolytic carbon defining a cavity of regular polygonal shape in at least one circumferential portion thereof for fitting over a correspondingly shaped femoral head, said shell having a bore extending centrally therethrough and a plurality of apertures distributed about a peripheral edge thereof for an invasion of tissue therein, each said aperture widening in trumpet-fashion at least inwardly towards said cavity from a central cross-section of shell thickness; and a metal anchoring pin extending through said bore and having a screw thread for anchoring said shell to a femoral head.
Claim 7
Dependent Claim
31 words
A cap-shaped endoprosthesis as set forth in claim 4, which further comprises a plastic member between said pin and said shell to maintain said pin out of contact with said shell.
References Cited (Backward Citations)
IT471394B
Cited
US2668531A
Cited
US3053251A
Cited
US3140712A
Cited
US3521302A
Cited
US4077070A
Cited
US3596656A
Cited
US3938198A
Cited
US3894297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-30 | 1984-03-31 | 1984-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-30 | 1988-03-31 | 1988-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-30 | 1992-03-31 | 1992-09-30 | $7700.00 | Window Closed / Lapsed |