US4642104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urethral catheter capable of preventing urinary tract infection and process for producing the same
Assignee: Unitika Ltd
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Filing: 1985-06-14
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Granted: 1987-02-10
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Expires: 2005-06-14
Abstract
Abstract A urethral catheter composed of olefin polymer, diene polymer or silicone polymer as a base material wherein an antimicrobial substance being chemically bonded with the inside wall and/or the outside wall thereof, and a process for producing the same. This urethral catheter effectively prevents urinary tract infection for a long period of time.
Inventors
- 👤 Izumi Sakamoto
- 👤 Kunihiko Takagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:57
CPC Classifications
A; A61; A61L; A61L29/00; A61L29/14; A61L29/16; A61M; A61M25/00; A61M25/0017; A61L2300/00; A61L2300/40; A61L2300/404; A61M25/0043; A61M2025/0056; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/139; Y10T428/1393
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
173 words
A urethral catheter capable of preventing urinary tract infection, comprising: a urethral catheter comprised of a material selected from the group consisting of an olefin polymer, a diene polymer or a silicone polymer as the base material; and an antimicrobial substance being ionically bonded with carboxyl groups in a film provided on the inside and/or outside walls of said urethral catheter, wherein: (a) said film is a hydrolysis product of the reaction product obtained by reacting (A) a copolymer of maleic acid anhydride and a copolymerizable compound with (B) a polyfunctional compound having hydroxyl groups under a condition of an excess amount of said polymer (A), and (b) The copolyer of maleic acid anhydride and a copolymerizable compound is a mixture of (I) about 0.5 to about 99.5 parts by weight of a copolymer of maleic acid anhydride and a copolymerizable vinyl monomer or olefin monomer and (II) about 0.5 to about 99.5 parts by weight of a copolymer of maleic acid anhydride and a copolymerizable aliphatic vinyl ester or aliphatic vinyl ether.
Claim 2
Dependent Claim
173 words
A urethral catheter capable of preventing urinary tract infection, comprising: a urethral catheter comprised of a material selected from the group consisting of an olefin polymer, a diene polymer or a silicone polymer as the base material; and an antimicrobial substance being ionically bonded with carboxyl groups in a film provided on the inside and/or outside walls of said urethral catheter, wherein: (a) said film is a hydrolysis product of the reaction product obtained by reacting (A) a copolymer of maleic acid anhydride and a copolymerizable compound with (B) a polyfunctional compound having hydroxyl groups under a condition of an excess amount of said polymer (A), and (b) The copolyer of maleic acid anhydride and a copolymerizable compound is a mixture of (I) about 0.5 to about 99.5 parts by weight of a copolymer of maleic acid anhydride and a copolymerizable vinyl monomer or olefin monomer and (II) about 0.5 to about 99.5 parts by weight of a copolymer of maleic acid anhydride and a copolymerizable aliphatic vinyl ester or aliphatic vinyl ether.
Claim 3
Dependent Claim
14 words
A urethral catheter according to claim 1, wherein said aromatic vinyl monomer is styrene.
Claim 4
Dependent Claim
15 words
A urethral catheter according to claim 1, wherein said olefin monomer is ethylene or propylene.
Claim 5
Dependent Claim
32 words
A urethral catheter according to claim 1, wherein said aliphatic vinyl ether is that which is selected from the group consisting of methyl vinyl ether, ethyl vinyl ether and butanediol vinyl ether.
Claim 6
Dependent Claim
15 words
A urethral catheter according to claim 1, wherein said aliphatic vinyl ester is vinyl acetate.
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) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |