US5059269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making an article having a hemocompatible surface
Assignee: Becton Dickinson and Co
•
Filing: 1990-03-09
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Granted: 1991-10-22
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Expires: 2010-03-09
Abstract
Abstract An article has a blood-contacting hemocompatible surface layer of a urethane-siloxane copolymer on a thermoplastic polymeric base material. The copolymer has siloxane segments prepared from hydroxyalkyl terminated polysiloxane glycols. The article is prepared by coextrusion of the base material and the copolymer.
Inventors
- 👤 Can B. Hu
- 👤 Donald D. Solomon
- 👤 Stanley C. Wells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:06
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/61; A; A61; A61L; A61L33/00; A61L33/06; A61L33/068
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
60 words
A method of preparing an article comprising coextruding a thermoplastic polymer and a copolymer having urethane and hydroxyalkyl-terminated siloxane segments whereby there is formed an article having a layer of said copolymer on said polymer, said layer being from about 5 to 50% by weight of said thermoplastic polymer, said copolymer providing said article with a surface which is hemocompatible.
Claim 2
Independent Claim
60 words
A method of preparing an article comprising coextruding a thermoplastic polymer and a copolymer having urethane and hydroxyalkyl-terminated siloxane segments whereby there is formed an article having a layer of said copolymer on said polymer, said layer being from about 5 to 50% by weight of said thermoplastic polymer, said copolymer providing said article with a surface which is hemocompatible.
Claim 3
Dependent Claim
23 words
The method in accordance with claim 1 wherein said polymer is selected from the group consisting of a polyurethane, polyolefin, polyester and polyurethaneurea.
Claim 4
Dependent Claim
22 words
The method in accordance with claim 2 wherein said polyurethane is selected from the group consisting of a polyetherurethane and a polyesterurethane.
Claim 5
Dependent Claim
19 words
The method in accordance with claim 2 wherein said polyurethane has a Shore hardness of about 50A to 75D.
Claim 6
Dependent Claim
21 words
The method in accordance with claim 1 wherein said copolymer has a tensile strength of about 1000-5000 pounds per square inch.
Claim 7
Dependent Claim
14 words
The method in accordance with claim 1 wherein said polysiloxane segment is hydroxybutyl terminated.
Claim 8
Dependent Claim
28 words
The method in accordance with claim 1 further comprising coextruding a tie layer whereby said article has a tie layer between said polymer and said layer of copolymer.
Claim 9
Independent Claim
68 words
A method of preparing an article comprising coextruding a thermoplastic polyurethane of Shore hardness about 50A to 75D and a copolymer having polyurethane segments and hydroxyalkyl-terminated polydimethyl siloxane segments whereby there is formed an article having a layer of said copolymer on said polyurethane, said layer being from about 5 to 50% by weight of said polyurethane, said copolymer providing said article with a surface which is hemocompatible.
Claim 10
Independent Claim
68 words
A method of preparing an article comprising coextruding a thermoplastic polyurethane of Shore hardness about 50A to 75D and a copolymer having polyurethane segments and hydroxyalkyl-terminated polydimethyl siloxane segments whereby there is formed an article having a layer of said copolymer on said polyurethane, said layer being from about 5 to 50% by weight of said polyurethane, said copolymer providing said article with a surface which is hemocompatible.
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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) | 1994-10-21 | 1995-04-22 | 1995-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-21 | 1999-04-22 | 1999-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-21 | 2003-04-22 | 2003-10-22 | $7700.00 | Window Closed / Lapsed |