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US5674293A
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Coated orthopaedic implant components
Assignee: Implant Sciences Corp
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Filing: 1996-01-19
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Granted: 1997-10-07
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Expires: 2016-01-19
Abstract
Abstract An improved coated orthopaedic implant component is disclosed. The implant may be coated with platinum for improved characteristics. Ion beam coating orthopaedic parts by ion implanting the parts with zirconium ions while the parts are immersed in an oxygen-containing background gas is also disclosed. The adhesion of the graded interface zirconium oxide surface layer so formed is further improved by the initial removal of surface contamination using an ion bombardment and the deposition of an intermediate layer of platinum or silicon between the orthopaedic metal component and the zirconium oxide. Furnace heating results in atomic interdiffusion to enhance adhesion between the surfaces. The zirconium oxide provides a low friction, low wear articulating surface. The graded interface may be characterized by a blackish color and a transition between pure zirconium oxide and pure intermediate layer that extends over a thickness of hundreds of Angstroms. In an alternative embodiment, the thickness of the zirconium oxide coating may be increased by also adding a simultaneous deposition of zirconium oxide on the parts.
Inventors
- 👤 Anthony J. Armini
- 👤 Stephen N. Bunker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:23
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/08; C23C14/083; A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61L; A61L27/00; A61L27/28; A61L27/30; A61L27/306; C23C14/22; C23C14/48; A61F2/3094; A61F2/38; A61F2/3859; A61F2002/30001; A61F2002/30667; A61F2002/30682; A61F2002/30685; A61F2002/30929; A61F2002/30934; A61F2/32; A61F2/36; A61F2/3609; A61F2002/3611; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00017; A61F2310/00023; A61F2310/00029; A61F2310/00389; A61F2310/00395; A61F2310/00419; A61F2310/00502; A61F2310/00508; A61F2310/00514; A61F2310/00556; A61F2310/00562; A61F2310/00592; A61F2310/00598; A61F2310/00634
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
69 words
A femoral component of an orthopaedic implant comprising: a metallic femoral part of an artificial joint having an articulating surface; and a platinum alloy coating deposited on the articulating surface, wherein the platinum alloy coating is interdiffused with the metallic part to provide a graded layer between the articulating surface and the platinum alloy coating and wherein the platinum alloy coating is about 0.2 to 5 micron in thickness.
Claim 2
Dependent Claim
69 words
A femoral component of an orthopaedic implant comprising: a metallic femoral part of an artificial joint having an articulating surface; and a platinum alloy coating deposited on the articulating surface, wherein the platinum alloy coating is interdiffused with the metallic part to provide a graded layer between the articulating surface and the platinum alloy coating and wherein the platinum alloy coating is about 0.2 to 5 micron in thickness.
Claim 3
Dependent Claim
16 words
The component of claim 2, wherein: the platinum alloy coating is about 1 micron in thickness.
Claim 4
Dependent Claim
16 words
The component of claim 2, wherein: the metallic femoral part is made of a cobalt-chrome alloy.
Claim 5
Dependent Claim
18 words
The component of claim 1, further comprising: a zirconium oxide graded interface embedded within the platinum alloy coating.
Claim 6
Dependent Claim
16 words
The component of claim 4, wherein: the metallic femoral part is made of a cobalt-chrome alloy.
Claim 7
Dependent Claim
16 words
The component of claim 4, wherein: the graded interface is about 50 to 5000 Angstroms thick.
Claim 8
Dependent Claim
77 words
A femoral component of an orthopaedic implant comprising: a metallic femoral part of an artificial joint having an articulating surface; a first coating deposited on the articulating surface that includes a material selected from a group consisting of silicon, platinum, and a platinum alloy, wherein the first coating is interdiffused with the metallic part to provide a graded layer between the articulating surface and the first coating; and a zirconium oxide coating disposed on the first coating.
Claim 9
Dependent Claim
77 words
A femoral component of an orthopaedic implant comprising: a metallic femoral part of an artificial joint having an articulating surface; a first coating deposited on the articulating surface that includes a material selected from a group consisting of silicon, platinum, and a platinum alloy, wherein the first coating is interdiffused with the metallic part to provide a graded layer between the articulating surface and the first coating; and a zirconium oxide coating disposed on the first coating.
Claim 10
Dependent Claim
22 words
The component of claim 7, wherein: the metallic femoral part is made of a cobalt-chrome alloy; and the first coating includes platinum.
Claim 11
Dependent Claim
17 words
The component of claim 7, further comprising: a zirconium oxide graded interface embedded within the first coating.
Claim 12
Dependent Claim
22 words
The component of claim 9, wherein: the metallic femoral part is made of a cobalt-chrome alloy; and the first coating includes platinum.
Claim 13
Dependent Claim
16 words
The component of claim 9, wherein: the graded interface is about 50 to 5000 Angstroms thick.
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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) | 2000-10-06 | 2001-04-07 | 2001-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-06 | 2005-04-07 | 2005-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-06 | 2009-04-07 | 2009-10-07 | $7700.00 | Window Closed / Lapsed |