US4978355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic bone implant having a reinforced contact surface
Assignee: Sulzer AG
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Filing: 1986-01-06
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Granted: 1990-12-18
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Expires: 2006-01-06
Abstract
Abstract A metal grid is embedded in the contact surface of a plastic implant in order to increase the wear resistance of the plastic implant. The ridge dimensions of the metal grid are chosen so that the elasticity of the plastic implant is not unduly reduced. An additional anchoring surface formed of layers of porous metal may be secured to the embedded grid to provide a surface into which bone tissue may grow in a cementless anchorage.
Inventors
- 👤 Otto Frey
- 👤 Manfred Semlitsch
- 👤 Heinz Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:45
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2/30907; A61F2/32; A61F2/34; A61F2002/30001; A61F2002/30003; A61F2002/30004; A61F2002/30011; A61F2002/30316; A61F2002/30317; A61F2002/30327; A61F2002/30909; A61F2002/30914; A61F2002/30915; A61F2002/30929; A61F2/3094; A61F2002/30967; A61F2002/30968; A61F2250/00; A61F2250/0014; A61F2250/0023; A61F2250/0039; A61F2310/00; A61F2310/00389; A61F2310/00395; A61F2310/00407; A61F2310/00419; A61F2310/00485; A61F2310/00491; A61F2310/00544
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
79 words
A bone implant having a plastic body defining a contact surface for contacting a bone, a metal grid embedded in and exposed to said surface of said body to impart an increased wear resistance to said surface relative to a bone and a plurality of porous layers of metal wire secured to said metal grid and extending over said contact surface, said porous layers having pores of increasing size from layer-to-layer in a direction away from said contact surface.
Claim 2
Dependent Claim
79 words
A bone implant having a plastic body defining a contact surface for contacting a bone, a metal grid embedded in and exposed to said surface of said body to impart an increased wear resistance to said surface relative to a bone and a plurality of porous layers of metal wire secured to said metal grid and extending over said contact surface, said porous layers having pores of increasing size from layer-to-layer in a direction away from said contact surface.
Claim 3
Dependent Claim
31 words
A bone implant as set forth in claim 1 wherein said metal grid is formed of crossing wires with at least some of said wires having crests defining enlarged bearing areas.
Claim 4
Dependent Claim
25 words
A bone implant as set forth in claim 1 wherein said grid is formed of wire as a diameter of from 0.2 to 1.5 millimeters.
Claim 5
Dependent Claim
16 words
A bone implant as set forth in claim 1 wherein said body is made of polyethylene.
Claim 6
Dependent Claim
28 words
A bone implant as set forth in claim 1 wherein said metal grid is made of a metal selected from the group consisting of titanium and titanium alloys.
References Cited (Backward Citations)
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GB2059267A
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Cited
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US4479271A
Cited
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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) | 1993-12-17 | 1994-06-18 | 1994-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-17 | 1998-06-18 | 1998-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-17 | 2002-06-18 | 2002-12-18 | $7700.00 | Window Closed / Lapsed |