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US4988362A
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Composition for coating bioceramics, method for coating bioceramics therewith, and composite bioceramics produced therewith
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1989-03-07
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Granted: 1991-01-29
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Expires: 2009-03-07
Abstract
Abstract A composition produced as a result of mixing alumina, silica, and a calcium phosphate compound in a specific ratio exhibits high affinity for bioceramics. When a bioceramic is coated with this composition and the coated bioceramic is heated, the composite is fused fast with the bioceramic to produce a composition bioceramic which is active to vital tissues.
Inventors
- 👤 Motohiro Toriyama
- 👤 Sukezo Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:23
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/02; A61L27/12; A61L27/28; A61L27/30; A61L27/32; A61F; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293; A61F2310/00389; A61F2310/00592; A61F2310/00796; Y; Y10; Y10S; Y10S623/00; Y10S623/92
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
151 words
A method for fusion of a bioceramic to the surface of a bioceramic inert to vital tissues, comprising: (A) coating the surface of said bioceramic inert to vital tissues with a bioceramic composition consisting essentially of a composition produced by mixing alumina and silica in a gravimetric ratio in the range of 1:2 to 1:4 thereby preparing a mixed powder and incorporating into said mixed powder a calcium phosphate compound in an amount in the range of 10 to 60% by weight, based on the amount of said mixed powder, thereby forming a coating layer on the surface of said bioceramic; (B) heating said bioceramic inert to vital tissues now provided with said coating layer thereby converting said coating layer into a solid solution containing aluminum phosphate formed by the reaction of calcium phosphate compound with alumina; and (C) cooling the resultant of (B), thereby accelerating crystallization of the coating layer.
Claim 2
Independent Claim
151 words
A method for fusion of a bioceramic to the surface of a bioceramic inert to vital tissues, comprising: (A) coating the surface of said bioceramic inert to vital tissues with a bioceramic composition consisting essentially of a composition produced by mixing alumina and silica in a gravimetric ratio in the range of 1:2 to 1:4 thereby preparing a mixed powder and incorporating into said mixed powder a calcium phosphate compound in an amount in the range of 10 to 60% by weight, based on the amount of said mixed powder, thereby forming a coating layer on the surface of said bioceramic; (B) heating said bioceramic inert to vital tissues now provided with said coating layer thereby converting said coating layer into a solid solution containing aluminum phosphate formed by the reaction of calcium phosphate compound with alumina; and (C) cooling the resultant of (B), thereby accelerating crystallization of the coating layer.
Claim 3
Dependent Claim
26 words
A method according to claim 1, wherein said calcium phosphate compound is at least one member selected from the group consisting of hydroxyapatite and tricalcium phosphate.
Claim 4
Dependent Claim
23 words
A method according to claim 1, wherein said coating composition is apoplied in the form of slurry to the surface of said bioceramic.
Claim 5
Dependent Claim
29 words
A method according to claim 1, wherein said coating composition is applied in the form of a film formed mainly of said composition to the surface of said bioceramic.
Claim 6
Dependent Claim
24 words
A method according to claim 1, wherein said bioceramic is at least one member selected from the group consisting of alumina, sapphire, and zirconia.
Claim 7
Dependent Claim
23 words
A method according to claim 1, wherein said coated bioceramic is heated at a temperature in the range of 1,000° to 1,500° C.
References Cited (Backward Citations)
US4605415A
Cited
US4681633A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-28 | 1994-07-30 | 1995-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-28 | 1998-07-30 | 1999-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-28 | 2002-07-30 | 2003-01-29 | $7700.00 | Window Closed / Lapsed |