US4950294A
Expired / Lapsed
US
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Composite structure useful as artificial bones
Assignee: Olympus Corp
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Filing: 1988-05-02
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Granted: 1990-08-21
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Expires: 2008-05-02
Abstract
Abstract A composite structure useful as an implant material in bones includes a matrix made of Al 2 O 3 --ZrO 2 (Y 2 O 3 ) ceramic material. The surface of the matrix is non-monocrystallized. A bio-active layer covers the matrix surface.
Inventors
- 👤 Yasuharu Hakamatsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:41
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/28; A61L27/30; A61L27/32; A61F; A61F2/00; A61F2/02; A61F2/28; A61L27/02; A61L27/10; A61L27/105; A61F2/30; A61F2/30767; A61F2002/30929; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00185; A61F2310/00203; A61F2310/00239; A61F2310/00389; A61F2310/00592; A61F2310/00796
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
76 words
A composite structure useful as an implant material in bone, comprising: a matrix made of Al 2 O 3 --ZrO 2 --Y 2 O 3 ceramic material having a composition of 10 to 40 mol % of Al 2 O 3 , 88 to 58 mol % of ZrO 2 and 0.5 to 2 mol % of Y 2 O 3 ; an amorphous surface layer; and a bio-active layer covering at least said amorphous layer.
Claim 2
Dependent Claim
76 words
A composite structure useful as an implant material in bone, comprising: a matrix made of Al 2 O 3 --ZrO 2 --Y 2 O 3 ceramic material having a composition of 10 to 40 mol % of Al 2 O 3 , 88 to 58 mol % of ZrO 2 and 0.5 to 2 mol % of Y 2 O 3 ; an amorphous surface layer; and a bio-active layer covering at least said amorphous layer.
Claim 3
Dependent Claim
18 words
The composite structure according to claim 1, wherein said matrix comprises an orientated crystal of said ceramic material.
Claim 4
Dependent Claim
14 words
The composite structure according to claim 1, wherein said ceramic material has eutectic composition.
Claim 5
Dependent Claim
18 words
The composite structure according to claim 1, wherein said matrix comprises a sintered body of said ceramic material.
Claim 6
Dependent Claim
19 words
The composite structure according to claim 1, wherein said surface layer has a thickness of 0.1 to 10 μm.
Claim 7
Dependent Claim
30 words
The composite structure according to claim 1, wherein said bio-active layer is made of at least one material selected from the group consisting of Hench glass, tricalcium phosphate and hydroxyapatite.
Claim 8
Dependent Claim
19 words
The composite structure according to claim 6, wherein said bio-active layer has a thickness of 2 to 3 μm.
Claim 9
Dependent Claim
18 words
The composite structure according to claim 1, wherein said amorphous surface layer covers all surface of said matrix.
Claim 10
Dependent Claim
19 words
The composite structure according to claim 1, wherein said bio-active layer covers all surface of said amorphous surface layer.
Claim 11
Dependent Claim
25 words
The composite structure according to claim 1, wherein said matrix has at least one side, said at least one side having grooves and projections thereon.
Claim 12
Dependent Claim
23 words
The composite structure according to claim 10, wherein said matrix has two opposing sides, each of said sides having grooves and projections thereon.
Claim 13
Dependent Claim
35 words
The composite structure according to claim 1, wherein said matrix has at least one side, and has a plurality of spaced apart projections protruding therefrom along the entire length of said at least one side.
Claim 14
Dependent Claim
35 words
The composite structure according to claim 12, wherein said matrix has two opposing sides, and has said spaced apart projections protruding from said two opposing sides along the entire length of said two opposing sides.
Claim 15
Dependent Claim
29 words
The composite structure according to claim 1 wherein said bio-active layer is made of at least one material selected from the group consisting of tricalcium phosphate and hydroxy apatite.
Claim 16
Dependent Claim
19 words
The composite structure according to claim 10 wherein said bio-active layer has a thickness of 2 to 3 microns.
Claim 17
Dependent Claim
26 words
The composite structure according to claim 1, wherein a surface layer of said matrix has been irradiated with laser beam to provide said amorphous surface layer.
Claim 18
Dependent Claim
90 words
A composite structure useful as an implant material in bone, comprising: a matrix made of Al 2 O 3 --ZrO 2 --Y 2 O 3 ceramic material having a composition of 10 to 40 mol % of Al 2 O 3 , 88 to 58 mol % of ZrO 2 and 0.5 to 2 mol % of Y 2 O 3 , a surface layer of said matrix having been amorphitized by irradiation with a laser beam; and a bio-active layer covering at least said amorphitized layer of the matrix.
Claim 19
Dependent Claim
90 words
A composite structure useful as an implant material in bone, comprising: a matrix made of Al 2 O 3 --ZrO 2 --Y 2 O 3 ceramic material having a composition of 10 to 40 mol % of Al 2 O 3 , 88 to 58 mol % of ZrO 2 and 0.5 to 2 mol % of Y 2 O 3 , a surface layer of said matrix having been amorphitized by irradiation with a laser beam; and a bio-active layer covering at least said amorphitized layer of the matrix.
Claim 20
Dependent Claim
17 words
The composite structure according to claim 17, wherein said laser beam in a carbon dioxide gas laser.
Claim 21
Dependent Claim
18 words
The composite structure according to claim 17, wherein said matrix comprises an oriented crystal of said ceramic material.
Claim 22
Dependent Claim
15 words
The composite structure according to claim 17, wherein said ceramic material has a eutectic composition.
Claim 23
Dependent Claim
18 words
The composite structure according to claim 17, wherein said matrix comprises a sintered body of said ceramic material.
Claim 24
Dependent Claim
19 words
The composite structure according to claim 17, wherein said surface layer has a thickness of 0.1 to 10 μm.
Claim 25
Dependent Claim
30 words
The composite structure according to claim 17, wherein said bio-active layer is made of at least one material selected from the group consisting of Hench glass, tricalcium phosphate and hydroxyapatite.
Claim 26
Dependent Claim
19 words
The composite structure according to claim 23, wherein said bio-active layer has a thickness of 2 to 3 μm.
Claim 27
Dependent Claim
19 words
The composite structure according to claim 17, wherein said amorphous surface layer covers the whole surface of said matrix.
Claim 28
Dependent Claim
20 words
The composite structure according to claim 17, wherein said bio-active layer covers the whole surface of said amorphous surface layer.
Claim 29
Dependent Claim
25 words
The composite structure according to claim 17, wherein said matrix has at least one side, said at least one side having grooves and projections thereon.
Claim 30
Dependent Claim
23 words
The composite structure according to claim 27, wherein said matrix has two opposing sides, each of said sides having grooves and projections thereon.
Claim 31
Dependent Claim
19 words
The composite structure according to claim 27, wherein said bio-active layer has a thickness of 2 to 3 microns.
Claim 32
Dependent Claim
29 words
The composite structure according to claim 17, wherein said bio-active layer is made of at least one material selected from the group consisting of tricalcium phosphate and hydroxy apatite.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |