US4851006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acetabulum
Assignee: Finsbury Instruments Ltd
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Filing: 1988-04-21
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Granted: 1989-07-25
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Expires: 2008-04-21
Abstract
Abstract An artificial acetabulum is described comprising a metal cup having on its outer surface means for locking the cup in a pelvic cavity, a hollow locating peg projecting from the base of the cup and integral therewith, and a liner within the cup and having a projection which fits within the hollow peg.
Inventors
- 👤 Michael A. Tuke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:09
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/34; A61F2002/30001; A61F2002/30316; A61F2002/30317; A61F2002/30322; A61F2002/30329; A61F2002/30331; A61F2002/30354; A61F2002/30378; A61F2002/30535; A61F2002/30593; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/30784; A61F2002/30787; A61F2002/3079; A61F2002/30795; A61F2002/3085; A61F2002/30858; A61F2002/3401; A61F2002/3412; A61F2002/3414; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2250/00; A61F2250/0014; A61F2250/0026
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
151 words
An artificial acetabulum comprising (1) a metal cup having an edge, an outer bone engaging surface extending from the edge to a base remote from the edge, self-tapping screw thread means functionally equivalent to approximately one turn of thread, formed on the outer surface adjacent the edge for engagment in cortical whereby the cup is locked in its final position in a pelvic cavity with just one rotation of said metal cup without destroying the sub-chondral plate, and a hollow peg projecting from the base of the cup and integral therewith, said hollow peg being coaxial with the axis of the self-tapping screw thread means and being adapted to fit in a prepared locating bore in a pelvic bone so as to form a pivot about which the cup can be rotated during implantation, and (2) a liner within the cup and having a projection which fits within the hollow peg.
Claim 2
Dependent Claim
151 words
An artificial acetabulum comprising (1) a metal cup having an edge, an outer bone engaging surface extending from the edge to a base remote from the edge, self-tapping screw thread means functionally equivalent to approximately one turn of thread, formed on the outer surface adjacent the edge for engagment in cortical whereby the cup is locked in its final position in a pelvic cavity with just one rotation of said metal cup without destroying the sub-chondral plate, and a hollow peg projecting from the base of the cup and integral therewith, said hollow peg being coaxial with the axis of the self-tapping screw thread means and being adapted to fit in a prepared locating bore in a pelvic bone so as to form a pivot about which the cup can be rotated during implantation, and (2) a liner within the cup and having a projection which fits within the hollow peg.
Claim 3
Dependent Claim
18 words
An artificial acetabulum according to claim 1, in which the outer surface of the metal cup is part-spherical.
Claim 4
Dependent Claim
19 words
An artificial acetabulum according to claim 1, in which the self-tapping screw thread means approximately one turn of thread.
Claim 5
Dependent Claim
50 words
An artificial acetabulum according to claim 1, in which the self-tapping screw thread means is formed only on a region of the outer surface of the cup adjacent the edge of the cup and a region of the outer surface of the cup adjacent the peg is free of thread.
Claim 6
Dependent Claim
50 words
An artificial acetabulum according to claim 3, in which the self-tapping screw thread means is formed only on a region of the outer surface of the cup adjacent the edge of the cup and a region of the outer surface of the cup adjacent the peg is free of thread.
Claim 7
Dependent Claim
20 words
An artificial acetabulum according to claim 1, in which the metal cup is made from titanium or from titanium alloy.
Claim 8
Dependent Claim
25 words
An artificial acetabulum according to claim 1, in which the metal cup is provided on said outer surface with a coating of a bone-compatible ceramic.
Claim 9
Dependent Claim
14 words
An artificial acetabulum according to claim 7, in which the bone-compatible ceramic is hydroxyapatite.
Claim 10
Dependent Claim
19 words
An artificial acetabulum according to claim 1, in which the liner is made of ultra high molecular weight polyethylene.
Claim 11
Dependent Claim
27 words
An artificial acetabulum according to claim 1; in which the metal cup is provided with at least one screw hole for reception of a bone fixation screw.
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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) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |