US4623347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antithrombogenic elastomer products
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1985-04-08
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Granted: 1986-11-18
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Expires: 2005-04-08
Abstract
Abstract Antithrombogenic elastomers comprising polyurethane or polyurethane urea, containing an organic silicone polymer in the main chain. A process for manufacturing such elastomers and molded products of such elastomers, are also disclosed.
Inventors
- 👤 Kazuaki Kira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:58
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/778; A; A61; A61L; A61L27/00; A61L27/14; A61L27/18; A61L33/00; A61L33/06; A61L33/068; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5096; C08G18/61; Y; Y10; Y10S; Y10S623/00; Y10S623/902; Y10S623/903
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
A method for the prevention of the clotting of blood in contact with medical devices comprising forming at least the blood contact surfaces of said devices from an elastomer comprising thermoplastic polyurethane or polyurethane urea containing 4 to 15 weight % of polysiloxane having a molecular weight of 500 to 10,000 in the main chain, and containing a polyether or a polyester having a molecular weight of 500 to 6,000 as a soft segment other than said polysiloxane.
Claim 2
Independent Claim
78 words
A method for the prevention of the clotting of blood in contact with medical devices comprising forming at least the blood contact surfaces of said devices from an elastomer comprising thermoplastic polyurethane or polyurethane urea containing 4 to 15 weight % of polysiloxane having a molecular weight of 500 to 10,000 in the main chain, and containing a polyether or a polyester having a molecular weight of 500 to 6,000 as a soft segment other than said polysiloxane.
Claim 3
Dependent Claim
16 words
The method of claim 1, wherein said polysiloxane has a molecular weight of 700 to 3,000.
Claim 4
Dependent Claim
20 words
The method of claim 1, wherein said elastomer has a soft segment content of from 40 to 80 weight %.
Claim 5
Dependent Claim
11 words
The method of claim 1, wherein said polysiloxane is a polydimethylsiloxane.
Claim 6
Dependent Claim
60 words
The method of claim 4, wherein said polydimethylsiloxane is of the formula: ##STR7## wherein R 1 to R 6 each stand for an alkylene group having at least one carbon atom, a and e are both integers of from 0 to 30, b and d are both 0 or 1, and c is an integer of from 6 to 134.
Claim 7
Dependent Claim
14 words
The method of claim 1, wherein said medical device is an artificial blood vessel.
Claim 8
Dependent Claim
14 words
The method of claim 1, wherein said medical device is a blood bypass tube.
Claim 9
Dependent Claim
78 words
In the manufacture of blood-contacting medical devices from materials of a non-mammalian origin, the improvement comprising forming at least the blood-contacting surface of said medical device from an elastomer comprising thermoplastic polyurethane or polyurethane urea containing 4 to 15 weight % of polysiloxane having a molecular weight of 500 to 10,000 in the main chain, and containing a polyether or a polyester having a molecular weight of 500 to 6,000 as a soft segment other than said polysiloxane.
Claim 10
Dependent Claim
78 words
In the manufacture of blood-contacting medical devices from materials of a non-mammalian origin, the improvement comprising forming at least the blood-contacting surface of said medical device from an elastomer comprising thermoplastic polyurethane or polyurethane urea containing 4 to 15 weight % of polysiloxane having a molecular weight of 500 to 10,000 in the main chain, and containing a polyether or a polyester having a molecular weight of 500 to 6,000 as a soft segment other than said polysiloxane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |