Patent US3952334A successfully refreshed from Google Patents.
US3952334A
Expired / Lapsed
US
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Biocompatible carbon prosthetic devices
Assignee: General Atomics Corp
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Filing: 1974-11-29
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Granted: 1976-04-27
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Expires: 1994-11-29
Abstract
Abstract A biocompatible prosthetic device comprising a metal alloy substrate, an intermediate layer of a high-temperature polymer which is strongly bonded thereto, and an exterior coating of dense vapor-deposited carbon. The carbon layer is thromboresistant and strongly adheres to the intermediate layer which in turn strongly adheres to the metal alloy. The polymer may be the reaction product of pyromelletic dianhydride and a diaminodiphenyl ether, and the carbon may be deposited under high vacuum conditions from a suitably heated carbon source, e.g., by ion-plating or vacuum vapor deposition.
Inventors
- 👤 Jack C. Bokros
- 👤 Jere B. Horsley, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:25
CPC Classifications
A; A61; A61L; A61L33/00; A61L33/02; A61L33/025; A61L27/00; A61L27/28; A61L27/34
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
58 words
A biocompatible prosthetic device comprising a metal alloy substrate, an intermediate, continuous layer of an organic high-temperature polymer which is strongly bonded thereto, and an exterior in-situ-deposited coating of continuous dense vapor-deposited carbon at least 1000A thick which carbon layer is biocompatible and strongly adherent to said intermediate layer as a result of its in situ vapor deposition.
Claim 2
Dependent Claim
58 words
A biocompatible prosthetic device comprising a metal alloy substrate, an intermediate, continuous layer of an organic high-temperature polymer which is strongly bonded thereto, and an exterior in-situ-deposited coating of continuous dense vapor-deposited carbon at least 1000A thick which carbon layer is biocompatible and strongly adherent to said intermediate layer as a result of its in situ vapor deposition.
Claim 3
Dependent Claim
18 words
A prosthetic device in accordance with claim 1 wherein said coating is not more than about 12,000A thick.
Claim 4
Dependent Claim
15 words
A prosthetic device in accordance with claim 1 wherein said polymer is a polyimide resin.
Claim 5
Dependent Claim
15 words
A prosthetic device in accordance with claim 1 wherein said polymer is a poly(amide-imide) resin.
Claim 6
Dependent Claim
22 words
A prosthetic device in accordance with claim 3 wherein said polymer is the reaction product of pyromelletic dianhydride and a diaminodiphenyl ether.
Claim 7
Dependent Claim
63 words
A biocompatible prosthetic device comprising a substrate, an intermediate continuous layer of an organic high-temperature polymer consisting essentially of a linear high-molecular-weight aromatic nitrogen-linked polymer, said intermediate layer being strongly bonded to said substrate, and an exterior coating at least 1000A thick of continuous, dense vapordeposited carbon, said carbon layer being deposited in situ upon said intermediate layer and thereby strongly adherent thereto.
Claim 8
Dependent Claim
63 words
A biocompatible prosthetic device comprising a substrate, an intermediate continuous layer of an organic high-temperature polymer consisting essentially of a linear high-molecular-weight aromatic nitrogen-linked polymer, said intermediate layer being strongly bonded to said substrate, and an exterior coating at least 1000A thick of continuous, dense vapordeposited carbon, said carbon layer being deposited in situ upon said intermediate layer and thereby strongly adherent thereto.
Claim 9
Dependent Claim
15 words
A prosthetic device in accordance with claim 6 wherein said substrate is a metal alloy.
Claim 10
Dependent Claim
32 words
A prosthetic device in accordance with claim 7 wherein said high temperature polymer is selected from the group consisting of ordered copolyamides, all-aromatic polybenzimidazoles, polyoxadiazoles, poly(N-phenyl triazoles), polybenzobenzimidazoles, polyimides and poly(amide-imide) resins.
Claim 11
Dependent Claim
15 words
A prosthetic device in accordance with claim 7 wherein said polymer is a polyimide resin.
Claim 12
Dependent Claim
15 words
A prosthetic device in accordance with claim 7 wherein said polymer is a poly(amide-imide) resin.
Claim 13
Dependent Claim
22 words
A prosthetic device in accordance with claim 7 wherein said polymer is the reaction product of pyromelletic dianhydride and a diaminodiphenyl ether.
References Cited (Backward Citations)
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Cited
US3579645A
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US3797113A
Cited
US3849887A
Cited
US3685059A
Cited
US3707006A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |