US5871547A
Expired / Lapsed
US
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Hip joint prosthesis having a zirconia head and a ceramic cup
Assignee: Saint Gobain Ceramics and Plastics Inc
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Filing: 1996-08-16
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Granted: 1999-02-16
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Expires: 2016-08-16
Abstract
Abstract This invention relates to a biojoint prosthesis comprising: a) a prosthetic comprising a first component having an outer surface comprising at least 90 mol% zirconia, and b) a second component having a surface shaped to receive the outer surface of the first component, wherein the outer surface of the first component is received on the surface of the second component, and wherein a) at least a portion of the surface of the second component receiving the first component comprises a ceramic having a surface roughness of no more than 100 nm, and b) the outer surface of the first component has a surface roughness of no more than 100 nm.
Inventors
- 👤 Marc Abouaf
- 👤 Edward Lilley
- 👤 Daniel Urffer
- 👤 Bernard Cales
- 👤 Oh-Hun Kwon
- 👤 Yves Stefani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:55
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3609; A61F2/30767; A61F2/38; A61F2/34; A61F2/3662; A61F2/3859; A61F2/389; A61F2/46; A61F2/468; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30084; A61F2002/30316; A61F2002/30317; A61F2002/30321; A61F2002/30329; A61F2002/30331; A61F2002/30332; A61F2002/30349; A61F2002/30621; A61F2002/30639; A61F2002/30649; A61F2002/30654; A61F2002/30655; A61F2002/30667; A61F2002/30682; A61F2002/30685; A61F2002/30934; A61F2002/3225; A61F2002/3233; A61F2002/348; A61F2002/3493; A61F2002/3611; A61F2002/3621; A61F2002/365; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2250/00; A61F2250/0014; A61F2250/0025; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023; A61F2310/00029; A61F2310/00179; A61F2310/00185; A61F2310/00203; A61F2310/00239; A61F2310/00299; A61F2310/00317
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
111 words
A joint prosthesis comprising: a) a prosthetic comprising a monolithic YTZP first component having an outer surface comprising at least 90 mol % zirconia, and b) a second component having a surface shaped to receive the outer surface of the first component, wherein the outer surface of the first component is received on the surface of the second component, and wherein a) at least a portion of the surface of the second component receiving the first component comprises a ceramic having a surface roughness of no more than 100 nm, and b) the outer surface of the monolithic YTZP first component has a surface roughness of no more than 100 nm.
Claim 2
Dependent Claim
111 words
A joint prosthesis comprising: a) a prosthetic comprising a monolithic YTZP first component having an outer surface comprising at least 90 mol % zirconia, and b) a second component having a surface shaped to receive the outer surface of the first component, wherein the outer surface of the first component is received on the surface of the second component, and wherein a) at least a portion of the surface of the second component receiving the first component comprises a ceramic having a surface roughness of no more than 100 nm, and b) the outer surface of the monolithic YTZP first component has a surface roughness of no more than 100 nm.
Claim 3
Dependent Claim
106 words
The prosthesis of claim 1 wherein the joint is a hip joint, the first component is a substantially spherical ceramic head, the second component is an acetabular cup having a socket surface shaped to rotatably receive the outer surface of the ceramic head, wherein the outer surface of the ceramic head is received in the socket surface of the acetabular cup, and wherein a) at least a portion of the socket surface receiving the head comprises a ceramic having a surface roughness of no more than 50 nm, and b) the outer surface of the head has a surface roughness of no more than 50 nm.
Claim 4
Dependent Claim
20 words
The prosthesis of claim 2 wherein the portion of the socket surface comprising a ceramic comprises at least one oxide.
Claim 5
Dependent Claim
21 words
The prosthesis of claim 3 wherein the portion of the socket surface comprising a ceramic comprises at least about 50% alumina.
Claim 6
Dependent Claim
50 words
The prosthesis of claim 3 wherein the ceramic comprising at least one oxide is selected from the group consisting of a ceramic consisting essentially of alumina having a grain size of less than one micron, YTZP zirconia having a surface roughness of no more than 15 nm, and zirconia-toughened alumina.
Claim 7
Dependent Claim
20 words
The prosthesis of claim 1 wherein the ceramic comprising at least one oxide is a ceramic consisting essentially of alumina.
Claim 8
Dependent Claim
19 words
The prosthesis of claim 6 wherein the head has a surface roughness Ra of no more than 10 nm.
Claim 9
Dependent Claim
29 words
The prosthesis of claim 2 wherein the outer surface of the ceramic head and the socket surface each have a surface roughness Ra of no more than 15 nm.
Claim 10
Dependent Claim
21 words
The prosthesis of claim 2 wherein the outer surface of the head has a monoclinic zirconia content of less than 10%.
Claim 11
Dependent Claim
29 words
The prosthesis of claim 6 wherein the outer surface of the head and the ceramic socket surface each have a surface roughness Ra of no more than 15 nm.
Claim 12
Dependent Claim
38 words
The prosthesis of claim 2 wherein the socket surface consists essentially of alumina, and wherein the surface roughness Ra of the outer surface of the head is at least twice the surface roughness Ra of the socket surface.
Claim 13
Dependent Claim
29 words
The prosthesis of claim 6 wherein the outer surface of the head and the ceramic socket surface each have a surface roughness Ra of no more than 10 nm.
Claim 14
Dependent Claim
66 words
The prosthesis of claim 1 wherein the articulating surfaces of the first and second components are selected such that each has a wear factor of less than 10 -7 mm 3 /Nm when subjected in tandem to ASTM G99 wherein the pin is the material of the outer surface of the first component and the plate is the material of the surface of the second component.
Claim 15
Dependent Claim
73 words
The prosthesis of claim 2 wherein the outer surface of the ceramic head and the socket surface of the acetabular cup are selected such that each has a wear factor of less than 10 -7 mm 3 /Nm when subjected in tandem to ASTM G99 wherein the pin is the material of the outer surface of the ceramic head and the plate is the material of the socket surface of the acetabular cup.
Claim 16
Dependent Claim
73 words
The prosthesis of claim 10 wherein the outer surface of the ceramic head and the socket surface of the acetabular cup are selected such that each has a wear factor of less than 10 -7 mm 3 /Nm when subjected in tandem to ASTM G99 wherein the pin is the material of the outer surface of the ceramic head and the plate is the material of the socket surface of the acetabular cup.
Claim 17
Dependent Claim
34 words
The prosthesis of claim 1 wherein at least a portion of the surface of the second component receiving the first component comprises a ceramic has a surface roughness of no more than 50 nm.
Claim 18
Dependent Claim
23 words
The prosthesis of claim 16 wherein the outer surface of the first component has a surface roughness of no more than 50 nm.
Claim 19
Dependent Claim
25 words
The prosthesis of claim 1 wherein the joint is a hip joint, the first component is a head and the second component is a cup.
Claim 20
Dependent Claim
13 words
The prosthesis of claim 18 wherein the socket surface consists essentially of YTZP.
Claim 21
Dependent Claim
28 words
The prosthesis of claim 19 wherein the socket surface and the outer surface of the head each have a surface roughness Ra of no more than 15 nm.
Claim 22
Dependent Claim
28 words
The prosthesis of claim 19 wherein the socket surface and the outer surface of the head each have a surface roughness Ra of no more than 10 nm.
Claim 23
Dependent Claim
28 words
The prosthesis of claim 19 wherein the socket surface and the outer surface of the head each have a surface roughness Ra of no more than 5 nm.
Claim 24
Dependent Claim
12 words
The prosthesis of claim 18 wherein the socket surface is zirconia-toughened alumina.
Claim 25
Dependent Claim
28 words
The prosthesis of claim 23 wherein the socket surface and the outer surface of the head each have a surface roughness Ra of no more than 20 nm.
Claim 26
Dependent Claim
28 words
The prosthesis of claim 23 wherein the socket surface and the outer surface of the head each have a surface roughness Ra of no more than 10 nm.
Claim 27
Dependent Claim
28 words
The prosthesis of claim 23 wherein the socket surface and the outer surface of the head each have a surface roughness Ra of no more than 5 nm.
Claim 28
Dependent Claim
16 words
The prosthesis of claim 18 wherein the zirconia-toughened alumina comprises at least 20 mol % zirconia.
Claim 29
Dependent Claim
28 words
The prosthesis of claim 27 wherein the socket surface and the outer surface of the head each have a surface roughness Ra of no more than 20 nm.
Claim 30
Dependent Claim
28 words
The prosthesis of claim 27 wherein the socket surface and the outer surface of the head each have a surface roughness Ra of no more than 10 nm.
Claim 31
Dependent Claim
28 words
The prosthesis of claim 27 wherein the socket surface and the outer surface of the head each have a surface roughness Ra of no more than 5 nm.
Claim 32
Dependent Claim
112 words
The prosthesis of claim 1 wherein the joint is a hip joint, the second component is a substantially spherical ceramic head consisting essentially of alumina, the first component is an acetabular cup having a monolithic YTZP socket surface shaped to rotatably receive the outer surface of the ceramic head, wherein the outer surface of the ceramic head is received in the socket surface of the acetabular cup, and wherein a) at least a portion of the socket surface receiving the head comprises a ceramic having a surface roughness of no more than 50 nm, and b) the outer surface of the head has a surface roughness of no more than 50 nm.
Claim 33
Dependent Claim
28 words
The prosthesis of claim 31 wherein the socket surface and the outer surface of the head each have a surface roughness Ra of no more than 20 nm.
Claim 34
Dependent Claim
46 words
An acetabular cup having a monolithic socket for receiving a ceramic femoral head having a surface roughness Ra of no more than 50 nm, wherein the improvement comprises the monolithic socket consists essentially of YTZP and has a surface roughness of no more than 50 nm.
Claim 35
Dependent Claim
46 words
An acetabular cup having a monolithic socket for receiving a ceramic femoral head having a surface roughness Ra of no more than 50 nm, wherein the improvement comprises the monolithic socket consists essentially of YTZP and has a surface roughness of no more than 50 nm.
Claim 36
Dependent Claim
93 words
A knee joint prosthesis comprising: a) a femoral component having a base and a plurality of tynes extending therefrom in the same direction, and b) a tibial plate having a surface shaped for receiving the tynes, wherein the tynes have an outer surface comprising zirconia partially stabilized by between 2 mol % and 5 mol % rare earth oxide and a surface roughness of no more than 100 nm, and wherein the surface of the tibial plate receiving the tynes is a ceramic having a surface roughness of no more than 100 nm.
Claim 37
Dependent Claim
93 words
A knee joint prosthesis comprising: a) a femoral component having a base and a plurality of tynes extending therefrom in the same direction, and b) a tibial plate having a surface shaped for receiving the tynes, wherein the tynes have an outer surface comprising zirconia partially stabilized by between 2 mol % and 5 mol % rare earth oxide and a surface roughness of no more than 100 nm, and wherein the surface of the tibial plate receiving the tynes is a ceramic having a surface roughness of no more than 100 nm.
Claim 38
Dependent Claim
24 words
The knee joint prosthesis of claim 34 wherein the outer surface of the tynes have a surface roughness of no more than 50 nm.
Claim 39
Dependent Claim
26 words
The knee joint of claim 35 wherein the surface of the tibial plate receiving the tynes has a surface roughness of no more than 50 nm.
References Cited (Backward Citations)
GB1371335A
Cited
US3744061A
Cited
US4198711A
Cited
FR2417972A1
Cited
US4636218A
Cited
EP0248117A2
Cited
FR2628314A1
Cited
EP0453694A1
Cited
EP0410711A1
Cited
US5338771A
Cited
EP0437390A1
Cited
EP0573694A2
Cited
EP0590241A1
Cited
EP0608997A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-02-15 | 2002-08-17 | 2003-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-15 | 2006-08-17 | 2007-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-15 | 2010-08-17 | 2011-02-16 | $7700.00 | Window Closed / Lapsed |