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US5725813A
Expired / Lapsed
US
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Process for the production of spongiosa bone ceramic shaped articles
Assignee: Biomet Deutschland GmbH
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Filing: 1996-02-15
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Granted: 1998-03-10
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Expires: 2016-02-15
Abstract
Abstract The invention relates to a process for the production of spongiosa bone ceramic shaped articles with geometrically irregular shapes and rounded angles and edges, which have no mechanically unstable or inhomogeneous regions. The shaped articles are obtained by treating spongiosa bone ceramic pieces in a ball mill.
Inventors
- 👤 Berthold Nies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:32
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/36; A61L27/3683; A61L27/3604; A61L27/3608; Y; Y10; Y10S; Y10S623/00; Y10S623/901
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
105 words
A process for the production of spongiosa bone ceramic shaped articles, which comprises mineralizing spongiosa bones in rough preshape pieces by the removal of all organic components, sintering the mineralized bone pieces to ceramic form, and then shaping the bone pieces in ceramic form by treatment in a ball mill made of Al 2 O 3 with the addition of balls made of Al 2 O 3 , in the presence of water, an aqueous salt solution or an organic solvent, whereby mechanically unstable regions of the bone pieces in ceramic form are abraded to give geometrically irregular shaped articles with rounded angles and edges.
Claim 2
Dependent Claim
105 words
A process for the production of spongiosa bone ceramic shaped articles, which comprises mineralizing spongiosa bones in rough preshape pieces by the removal of all organic components, sintering the mineralized bone pieces to ceramic form, and then shaping the bone pieces in ceramic form by treatment in a ball mill made of Al 2 O 3 with the addition of balls made of Al 2 O 3 , in the presence of water, an aqueous salt solution or an organic solvent, whereby mechanically unstable regions of the bone pieces in ceramic form are abraded to give geometrically irregular shaped articles with rounded angles and edges.
Claim 3
Dependent Claim
17 words
The process of claim 1, wherein the spongiosa bones are heads of bone from newly slaughtered cattle.
Claim 4
Dependent Claim
28 words
The process of claim 1, further comprising, before final sintering, treating the bone pieces with an aqueous solution of an organic acid to leach out calcium oxide components.
Claim 5
Dependent Claim
12 words
The process of claim 3, wherein the organic acid is citric acid.
Claim 6
Dependent Claim
23 words
The process of claim 1, wherein the balls made of Al 2 O 3 have a diameter of between 9 and 50 mm.
Claim 7
Dependent Claim
42 words
The process of claim 1, wherein the shaping in the ball mill is conducted for from about 2 to 6 hours in a ball mill with a capacity of 10 liters and a bulk volume of about 5 liters of mill charge.
Claim 8
Dependent Claim
21 words
The process of claim 1, wherein the volume ratio of solids to liquids in the mill charge is 0.5 to 2.5.
Claim 9
Dependent Claim
19 words
The process of claim 1, wherein the shaping in the ball mill is conducted in the presence of water.
Claim 10
Dependent Claim
20 words
The process of claim 1, wherein the shaping in the ball mill is conducted in the presence of an alcohol.
Claim 11
Dependent Claim
24 words
The process of claim 1, wherein the shaping in the ball mill is conducted in the presence of a calcium or phosphate salt solution.
Claim 12
Dependent Claim
50 words
A process for the production of spongiosa bone ceramic shaped articles, which comprises shaping bone pieces, mineralized and sintered to ceramic form, by treatment in a ball mill containing balls made of Al 2 O 3 , in the presence of water, an aqueous salt solution or an organic solvent.
Claim 13
Dependent Claim
50 words
A process for the production of spongiosa bone ceramic shaped articles, which comprises shaping bone pieces, mineralized and sintered to ceramic form, by treatment in a ball mill containing balls made of Al 2 O 3 , in the presence of water, an aqueous salt solution or an organic solvent.
Claim 14
Dependent Claim
29 words
The process of claim 11, wherein mechanically unstable regions of the bone pieces in ceramic form are abraded to give geometrically irregular shapes articles with rounded angles and edges.
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) | 2001-03-09 | 2001-09-08 | 2002-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-09 | 2005-09-08 | 2006-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-09 | 2009-09-08 | 2010-03-10 | $7700.00 | Window Closed / Lapsed |