US5064436A
Expired / Lapsed
US
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Bone prosthetic material
Assignee: Pentax Corp
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Filing: 1989-07-03
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Granted: 1991-11-12
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Expires: 2009-07-03
Abstract
Abstract A bone prosthetic material composed of calcium phosphate group granules which have open cells with an average pore size of 0.01-(10 μm) 2 over a surface density of at least one per 10 μm 2 . The prosthetic material is prepared by mixing organic inflammable particles with a calcium based powder, granulating and then firing the mixture.
Inventors
- 👤 Makoto Ogiso
- 👤 Tetsuro Ogawa
- 👤 Takeshi Ichitsuka
- 👤 Masahide Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:10
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/009; A; A61; A61F; A61F2/00; A61F2/02; A61F2/28; A61L; A61L27/00; A61L27/02; A61L27/12; A61L27/50; A61L27/56; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
59 words
A bone prosthetic material composed of porous calcium phosphate group based granules having homogeneous sized open cells with an average pore size of 0.01-10 μm, wherein said granules have on average at least one of said open cells within a surface area of (10 μm) 2 and the cells are homogeneously distributed and in direct contact with one another.
Claim 2
Dependent Claim
59 words
A bone prosthetic material composed of porous calcium phosphate group based granules having homogeneous sized open cells with an average pore size of 0.01-10 μm, wherein said granules have on average at least one of said open cells within a surface area of (10 μm) 2 and the cells are homogeneously distributed and in direct contact with one another.
Claim 3
Dependent Claim
18 words
A bone prosthetic material according to claim 1, wherein said granules have an average size of 0.1-1 mm.
Claim 4
Dependent Claim
15 words
A bone prosthetic material according claim 1, wherein said granules have a porosity of 60-90%.
Claim 5
Dependent Claim
17 words
A bone prosthetic material according to claim 1, wherein said calcium phosphate group granules comprise hydroxy apatite.
Claim 6
Dependent Claim
17 words
A bone prosthetic material according to claim 1, wherein said calcium phosphate group granules comprise tricalcium phosphate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-11 | 1995-05-13 | 1995-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-11 | 1999-05-13 | 1999-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-11 | 2003-05-13 | 2003-11-12 | $7700.00 | Window Closed / Lapsed |