Patent US4447590A successfully refreshed from Google Patents.
US4447590A
Expired / Lapsed
US
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Extrudable polyurethane for prosthetic devices prepared from a diisocyanate, a polytetramethylene ether polyol and 1,4 butane diol
Assignee: Thermo Fisher Scientific Inc
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Filing: 1983-04-04
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Granted: 1984-05-08
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Expires: 2003-04-04
Abstract
Abstract Reaction product of an aliphatic organic diisocyanate, a high molecular weight polyether polyol (poly tetra methylene ether glycol) and 1,4 butane diol. The resulting polymers have thromboresistant properties, a long flexural life and are extrudable. The polyurethane polymer is ideal for forming transvenous cardiac pacemaker leads, blood bags, intravenous and intra-arterial catheters and tubing, and other shaped devices which must be formed of a blood compatible material.
Inventors
- 👤 Michael Szycher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:33
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6603; C08G18/6607; C08G18/40; C08G18/48; C08G18/4854; C08G18/6666; C08G18/667; C08G18/6674; C08G18/70; C08G18/72; C08G18/73; C08G18/74; C08G18/75
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A polyurethane polymer to be used in molding devices for use in the human body and requiring a high degree of blood compatibility, said polymer being a polyurethane elastomer and the reaction product of: (a) dicyclohexyl methane diisocyanate; (b) a polytetramethylene ether polyol having a molecular weight in the range of 1000-2000; and (c) 1,4 butane diol, wherein for each diol there are two dicyclohexyl methane diisocyanates and one glycol; and the average molecular weight of the polymer is 120,000 units, and a weight average molecular weight of 315,000 molecular weight units.
Claim 2
Dependent Claim
92 words
A polyurethane polymer to be used in molding devices for use in the human body and requiring a high degree of blood compatibility, said polymer being a polyurethane elastomer and the reaction product of: (a) dicyclohexyl methane diisocyanate; (b) a polytetramethylene ether polyol having a molecular weight in the range of 1000-2000; and (c) 1,4 butane diol, wherein for each diol there are two dicyclohexyl methane diisocyanates and one glycol; and the average molecular weight of the polymer is 120,000 units, and a weight average molecular weight of 315,000 molecular weight units.
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) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |