US4265928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-thrombogenic retentive catheter
Assignee: B Braun Surgical AG
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Filing: 1979-09-26
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Granted: 1981-05-05
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Expires: 1999-09-26
Abstract
Abstract An anti-thrombogenic retentive catheter with a negatively-charged surface is manufactured by providing it with a negatively-charged coating. The coating can be applied by immersing the catheter, at least once, into pyridine or a toluol/tetrahydrofuran solution of a copolymerizate of ethylene with acrylic acid, or esters or salts of the copolymerizate and, after the last immersion, by drying the coating until no solvent is detectable.
Inventors
- 👤 Bernd Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:54
CPC Classifications
A; A61; A61L; A61L33/00; A61L33/06; A61L33/064; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J2423/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
50 words
A method of producing an anti-thrombogenic retentive catheter with a negatively charged surface, which comprises coating a polyvinylchloride or polyethylene catheter with a solution in pyridine, or a solvent mixture of toluol and tetrahydrofuran, of a copolymerizate of ethylene with acrylic acid, or an ester or salt of the copolymerizate.
Claim 2
Independent Claim
50 words
A method of producing an anti-thrombogenic retentive catheter with a negatively charged surface, which comprises coating a polyvinylchloride or polyethylene catheter with a solution in pyridine, or a solvent mixture of toluol and tetrahydrofuran, of a copolymerizate of ethylene with acrylic acid, or an ester or salt of the copolymerizate.
Claim 3
Dependent Claim
19 words
A method according to claim 1 in which the coating is dried, after application, until no solvent is detectable.
Claim 4
Dependent Claim
19 words
A method according to claim 1 in which the catheter is cleaned of lubricants before the coating is applied.
Claim 5
Dependent Claim
36 words
A method according to claim 1 in which the coating comprises a plurality of layers, each layer is applied as a solvent solution of the copolymerizate, and subsequent layers are applied to prior layers while tacky.
Claim 6
Dependent Claim
20 words
A method according to claim 1 in which the coating is applied by immersing the catheter in the solvent solution.
Claim 7
Independent Claim
47 words
A method of producing an anti-thrombogenic retentive catheter with a negatively-charged surface, which comprises coating the catheter surface with a solution in pyridine, or a solvent mixture of toluol and tetrahydrofuran, of a copolymerizate of ethylene with acrylic acid, or an ester or salt of the copolymerizate.
Claim 8
Independent Claim
47 words
A method of producing an anti-thrombogenic retentive catheter with a negatively-charged surface, which comprises coating the catheter surface with a solution in pyridine, or a solvent mixture of toluol and tetrahydrofuran, of a copolymerizate of ethylene with acrylic acid, or an ester or salt of the copolymerizate.
Claim 9
Independent Claim
61 words
A method of producing an anti-thrombogenic retentive catheter with a negatively-charged surface, which comprises coating the catheter surface with a plurality of layers of a copolymerizate of ethylene with acrylic acid, or an ester or salt of the copolymerizate, with each layer being applied as a solvent solution of the copolymerizate, and subsequent layers are applied to prior layers while tacky.
Claim 10
Independent Claim
61 words
A method of producing an anti-thrombogenic retentive catheter with a negatively-charged surface, which comprises coating the catheter surface with a plurality of layers of a copolymerizate of ethylene with acrylic acid, or an ester or salt of the copolymerizate, with each layer being applied as a solvent solution of the copolymerizate, and subsequent layers are applied to prior layers while tacky.
Claim 11
Dependent Claim
28 words
A method according to claim 7 in which the coating of the copolymerizate is applied as a solution in pyridine or a solvent mixture of toluol and tetrahydrofuran.
Claim 12
Dependent Claim
23 words
A method according to claim 7 in which the catheter is made from a member of the group consisting of polyvinylchloride and polyethylene.
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) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |