Patent US4813960A successfully refreshed from Google Patents.
US4813960A
Expired / Lapsed
US
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Endoprosthesis for a hip joint socket
Assignee: Protek AG
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Filing: 1987-02-05
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Granted: 1989-03-21
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Expires: 2007-02-05
Abstract
Abstract The hip joint endoprosthesis has a plastic socket body with a hemispherical outer surface and a wire mesh metal grid partially embedded in the socket body surface. The metal grid has a plurality of rib-like projections extending outwardly along meridian lines of the socket body in order to define regions therebetween for receiving a minimum thickness of bone cement for anchoring of the endoprosthesis in a bone.
Inventors
- 👤 Maurice E. Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:01
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2/30907; A61F2/32; A61F2/34; A61F2/30771; A61F2002/30878; A61F2002/30879; A61F2002/30909; A61F2002/30915; A61F2002/30929; A61F2002/3412; A61F2002/3417; A61F2/46; A61F2002/4631
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
78 words
An endoprosthesis for a hip joint socket comprising an inner plastic socket body having a hemispherical outer surface; and a multi-layer metal grid fixed to said surface of said body, said grid forming a plurality of uniformly distributed rib-like projections extending outwardly along meridian lines for contacting bone while defining regions therebetween to receive bone cement, said projections being disposed on opposite sides of a rib-free region medially of said surface and in offset relation to each other.
Claim 2
Dependent Claim
78 words
An endoprosthesis for a hip joint socket comprising an inner plastic socket body having a hemispherical outer surface; and a multi-layer metal grid fixed to said surface of said body, said grid forming a plurality of uniformly distributed rib-like projections extending outwardly along meridian lines for contacting bone while defining regions therebetween to receive bone cement, said projections being disposed on opposite sides of a rib-free region medially of said surface and in offset relation to each other.
Claim 3
Dependent Claim
21 words
An endoprosthesis as set forth in claim 1 wherein said grid is countersunk in a polar region relative to said projections.
Claim 4
Dependent Claim
24 words
An endoprosthesis as set forth in claim 2 wherein said grid is partially embedded in said body to at least partially fill said projections.
Claim 5
Dependent Claim
24 words
An endoprosthesis as set forth in claim 1 wherein said grid is partially embedded in said body to at least partially fill said projections.
Claim 6
Dependent Claim
67 words
An endoprosthesis for a hip joint socket comprising a plastic socket body having a hemispherical outer surface; and a wire mesh metal grid partially embedded in said surface of said plastic body, said grid forming a plurality of rib-like projections extending outwardly thereof for contacting bone while defining regions therebetween to receive a bone cement bed said projections being disposed along meridian lines of said hemispherical surface.
Claim 7
Dependent Claim
67 words
An endoprosthesis for a hip joint socket comprising a plastic socket body having a hemispherical outer surface; and a wire mesh metal grid partially embedded in said surface of said plastic body, said grid forming a plurality of rib-like projections extending outwardly thereof for contacting bone while defining regions therebetween to receive a bone cement bed said projections being disposed along meridian lines of said hemispherical surface.
Claim 8
Dependent Claim
22 words
An endoprosthesis as set forth in claim 5 wherein said projections are disposed in two circumferential rows with a projection-free zone therebetween.
Claim 9
Dependent Claim
29 words
An endoprosthesis as set forth in claim 5 wherein said projections extend to a polar region of said grid whereby said polar region is countersunk relative to said projections.
Claim 10
Dependent Claim
18 words
An endoprosthesis as set forth in claim 5 wherein said projections are uniformly distributed over said socket surface.
Claim 11
Dependent Claim
15 words
An endoprosthesis as set forth in claim 5 wherein said grid is of multi-layer construction.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |