US5049140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antimicrobial fitting for medical catheters and method for their application
Assignee: Carl Freudenberg KG
•
Filing: 1990-01-22
•
Granted: 1991-09-17
•
Expires: 2010-01-22
Abstract
Abstract A tube or ring-shaped, elastic cuff is used as a antimicrobial fitting for medical catheters. The fitting is manufactured from organic silicon/polyurethane elastomer including an antimicrobial agent. The fitting is annularly disposed on a catheter and held in place by radial tension. The fitting has very high tensile strength and resistance to tearing and preferably has a wall thickness of about 0.1 mm; may be cut into segments of 2 to 10 cm long; and can be drawn onto a catheter as individual segments.
Inventors
- 👤 Otto Brenner
- 👤 Christoph Josefiak
- 👤 Gunter Schuhmacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:34
CPC Classifications
A; A61; A61L; A61L29/00; A61L29/14; A61L29/16; A61L29/04; A61L29/06; A61L2300/00; A61L2300/10; A61L2300/102; A61L2300/104; A61L2300/40; A61L2300/404; A61M; A61M25/00; A61M25/0043; A61M2025/0056
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
87 words
An antimicrobial fitting for a catheter, comprising: a tubular member having a Shore A hardness between about 80 and 95 fabricated from a silcone/polyurethane elastomer comprised of less than about 50% wt. organic silicone polymer having a molecular weight of about 500 to 10,000, and about 1 to 15% wt. of an antimicrobial agent uniformly dispersed in said elastomer and wherein the tubular member has a tensible strength of about 20 MPa, a breaking elongation of about 500% and a surface roughness less than about 6 micrometers.
Claim 2
Dependent Claim
87 words
An antimicrobial fitting for a catheter, comprising: a tubular member having a Shore A hardness between about 80 and 95 fabricated from a silcone/polyurethane elastomer comprised of less than about 50% wt. organic silicone polymer having a molecular weight of about 500 to 10,000, and about 1 to 15% wt. of an antimicrobial agent uniformly dispersed in said elastomer and wherein the tubular member has a tensible strength of about 20 MPa, a breaking elongation of about 500% and a surface roughness less than about 6 micrometers.
Claim 3
Dependent Claim
38 words
The fitting of claim 1, wherein: the antimicrobial agent is selected from the group consisting of metals, metal salts, oxides, carbides and sulphates and organometalic compounds, that release metal ions from the silicone/polyurethane elastomer in antimicrobially effective amounts.
Claim 4
Dependent Claim
34 words
The fitting of claim 1, wherein: the fitting is for a uretheral catheter and the tubular member has a wall thickness of about 0.1 micrometer, and interior diameter of about 1.5 to 7.5 mm.
Claim 5
Dependent Claim
12 words
The fitting of claim 3, wherein: the antimicrobial agent is silver sulfate.
Claim 6
Dependent Claim
14 words
The fitting of claim 1, wherein: said tubular member comprises a plurality of segments.
Claim 7
Dependent Claim
22 words
The fitting of claim 3, wherein: said tubular member comprises a plurality of segments of about 2 to 10 cm in length.
Claim 8
Independent Claim
102 words
A method for making a catheter having antimicrobial properties, comprising the steps of: preparing a fitting comprising a tubular member fabricated with an organic silicone/polyurethane elastomer including less than about 50% wt organic silicone polymer having a molecular weight of about 500 to 10,000 and having an antimicrobial agent uniformly dispersed therein; sizing said tubular member so that it has an inside diameter that is about equal to or less than the catheter's outside diameter; cutting said tubular member into segments; and drawing a plurality of said segments onto a portion of the catheter which will be inserted into a body cavity.
Claim 9
Independent Claim
102 words
A method for making a catheter having antimicrobial properties, comprising the steps of: preparing a fitting comprising a tubular member fabricated with an organic silicone/polyurethane elastomer including less than about 50% wt organic silicone polymer having a molecular weight of about 500 to 10,000 and having an antimicrobial agent uniformly dispersed therein; sizing said tubular member so that it has an inside diameter that is about equal to or less than the catheter's outside diameter; cutting said tubular member into segments; and drawing a plurality of said segments onto a portion of the catheter which will be inserted into a body cavity.
Claim 10
Dependent Claim
50 words
The method of claim 7 wherein the inside diameter of said tubular member and the outside diameter of said catheter are in a ratio of about 1 :1.2 to 1 :1.8; said segments are about 5 cm long and are spaced abut 1 to 3 cm apart on said catheter.
Claim 11
Dependent Claim
21 words
The method of claim 8 wherein the segments cover at least about 50% of an exposed surface of the catheter portion.
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) | 1994-09-16 | 1995-03-18 | 1995-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-16 | 1999-03-18 | 1999-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-16 | 2003-03-18 | 2003-09-17 | $7700.00 | Window Closed / Lapsed |