US5116824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biomaterial comprising a composite material of a chitosan derivative and collagen derivative
Assignee: Koken Co Ltd
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Filing: 1990-10-29
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Granted: 1992-05-26
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Expires: 2010-10-29
Abstract
Abstract A biomaterial excellent in biocompatibility comprising a composite material of an N-acylchitosan and collagen is described. This biomaterial is suitable for used as a wound dressing material, vascular prosthesis, artificial skin or hemostatic agent.
Inventors
- 👤 Teruo Miyata
- 👤 Kazuhiko Kodaira
- 👤 Hitoshi Higashijima
- 👤 Takashi Kimura
- 👤 Yasuharu Noishiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:49
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/225; A61L15/42; A61L15/425; A61L27/00; A61L27/14; A61L27/26; A61L27/50; A61L27/507; A61L27/60; A61L2400/00; A61L2400/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
90 words
A wound dressing material comprising a composite material of an N-succinylchitosan and atelocollagen in a proportion of 50 to 90% by weight of the N-succinylchitosan to 10 to 50% by weight of the compound selected from the group consisting of atelocollagen, acetylated atelocollagen and methylated atelocollagen, the composite material being crosslinked and in the form of a sponge or film and the N-succinylchitosan being obtained by succinylation of chitosan prepared by deacetylation of chitin with a concentrated alkali to form a chitosan succinylated in a proportion of at least 55%.
Claim 2
Dependent Claim
90 words
A wound dressing material comprising a composite material of an N-succinylchitosan and atelocollagen in a proportion of 50 to 90% by weight of the N-succinylchitosan to 10 to 50% by weight of the compound selected from the group consisting of atelocollagen, acetylated atelocollagen and methylated atelocollagen, the composite material being crosslinked and in the form of a sponge or film and the N-succinylchitosan being obtained by succinylation of chitosan prepared by deacetylation of chitin with a concentrated alkali to form a chitosan succinylated in a proportion of at least 55%.
Claim 3
Dependent Claim
15 words
The wound dressing material according to claim 1 wherein the atelocollagen is acetylated or methylated.
Claim 4
Dependent Claim
35 words
The wound dressing material of claim 1, wherein the composite material further contains at least one member selected from the group consisting of chondroitin-4 sulfuric acid, dermatan sulfate, chondroitin-6 sulfuric acid, hyaluronic acid, and fibrin.
References Cited (Backward Citations)
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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) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |