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US5007930A
Expired / Lapsed
US
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Composites of unsintered calcium phosphates and synthetic biodegradable polymers useful as hard tissue prosthetics
Assignee: Dow Chemical Co
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Filing: 1990-08-06
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Granted: 1991-04-16
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Expires: 2010-08-06
Abstract
Abstract A process for the prosthetic supplementation or replacement of hard tissue. In the process an anatomically-shaped form is molded by or a prosthetic device is coated with a composite material containing unsintered calcium phosphate biomaterial, a synthetic biodegradable polymer, and optionally, a pore-forming agent.
Inventors
- 👤 Linneaus C. Dorman
- 👤 Paul A. Meyers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:47
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/10; A; A61; A61L; A61L27/00; A61L27/40; A61L27/44; A61L27/46; A61L27/50; A61L27/56; A61F; A61F2210/00; A61F2210/0004
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
51 words
A process for the prosthetic supplementation or replacement of hard tissue which comprises coating a conventional prosthetic device with a composite material containing from about 25 to about 75 percent by weight of an unsintered calcium phosphate biomaterial and about 75 to about 25 percent by weight of synthetic biodegradable polymer.
Claim 2
Dependent Claim
51 words
A process for the prosthetic supplementation or replacement of hard tissue which comprises coating a conventional prosthetic device with a composite material containing from about 25 to about 75 percent by weight of an unsintered calcium phosphate biomaterial and about 75 to about 25 percent by weight of synthetic biodegradable polymer.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein said synthetic biodegradable polymer is an α-amino acid polymer.
Claim 4
Dependent Claim
50 words
The process of claim 2 wherein said composite material also contains from about 5 to about 30 percent by weight of a pore-forming agent capable of porositization of the composite material, (said weight of the pore-forming agent being based on the total weight of the composite material plus pore-forming agent).
Claim 5
Dependent Claim
50 words
The process of claim 2 wherein said composite material also contains from about 10 to about 20 percent by weight of a pore-forming agent capable of porositization of the composite material, (said weight of the pore-forming agent being based on the total weight of the composite material plus pore-forming agent).
Claim 6
Dependent Claim
74 words
A process for the prosthetic supplementation or replacement of hard tissue which process comprises coating a conventional prosthetic device with a composite material containing from about 25 to about 75 percent by weight of an unsintered calcium phosphate biomaterial, wherein the unsintered calcium phosphate biomaterial is unsintered hydroxyapatite or unsintered tricalcium phosphate and about 75 to about 25 percent by weight of synthetic biodegradable polymer, and the biodegradable polymer is a glutamic acid-γ-ester polymer.
Claim 7
Dependent Claim
74 words
A process for the prosthetic supplementation or replacement of hard tissue which process comprises coating a conventional prosthetic device with a composite material containing from about 25 to about 75 percent by weight of an unsintered calcium phosphate biomaterial, wherein the unsintered calcium phosphate biomaterial is unsintered hydroxyapatite or unsintered tricalcium phosphate and about 75 to about 25 percent by weight of synthetic biodegradable polymer, and the biodegradable polymer is a glutamic acid-γ-ester polymer.
Claim 8
Dependent Claim
13 words
The process of claim 5 wherein the glutamic acid-γ-ester is glutamic acid-γ-methyl ester.
Claim 9
Dependent Claim
13 words
The process of claim 5 wherein the glutamic acid-γ-ester is glutamic acid-γ-benzyl ester.
Claim 10
Dependent Claim
25 words
The process of claim 6 wherein said composite material contains from about 40 to about 60 percent by weight of said unsintered calcium phosphate biomaterial.
Claim 11
Dependent Claim
25 words
The process of claim 7 wherein said composite material contains from about 40 to about 60 percent by weight of said unsintered calcium phosphate biomaterial.
References Cited (Backward Citations)
US4192021A
Cited
US4373217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-15 | 1994-10-15 | 1995-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-15 | 1998-10-15 | 1999-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-15 | 2002-10-15 | 2003-04-16 | $7700.00 | Window Closed / Lapsed |