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US6071266A
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Lubricious medical devices
Assignee: Individual
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Filing: 1998-10-23
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Granted: 2000-06-06
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Expires: 2018-10-23
Abstract
Abstract Lubricious medical devices such as catheters and stents which minimize friction and retain lubricity and dimensional properties for a long period of time. The devices are made by coextrusion wherein the inner layer is a hydrophobic polymer and the outer layer is a blend of a hydrophilic polymer and hydrophobic polymer. Devices made by extrusion of a blend of hydrophobic polymer with a blend of hydrophobic/hydrophilic polymer are described also.
Inventors
- 👤 Donald W. Kelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:42
CPC Classifications
A; A61; A61L; A61L31/00; A61L31/08; A61L31/10; A61L29/00; A61L29/04; A61L29/049; A61L29/08; A61L29/085; A61L31/04; A61L31/041; A61F; A61F2/00; A61F2/82; A61L2400/00; A61L2400/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
A lubricious medical device having a very low coefficient of friction which comprises: a laminate of two polymeric layers wherein one layer constitutes the inner layer and one layer constitutes the outer layer; said inner layer being formed of a hydrophobic polymer; said outer layer being formed of a lubricious polymeric blend of a hydrophilic polymer and a hydrophobic polymer; said polymeric blend constituting not less that about 25 percent of the thickness of the laminate; said hydrophilic polymer constituting not less that about 25 percent of the lubricious polymeric blend; and said medical device having the property of retaining its original dimensional properties after prolonged exposure to hydrophilic liquid.
Claim 2
Dependent Claim
110 words
A lubricious medical device having a very low coefficient of friction which comprises: a laminate of two polymeric layers wherein one layer constitutes the inner layer and one layer constitutes the outer layer; said inner layer being formed of a hydrophobic polymer; said outer layer being formed of a lubricious polymeric blend of a hydrophilic polymer and a hydrophobic polymer; said polymeric blend constituting not less that about 25 percent of the thickness of the laminate; said hydrophilic polymer constituting not less that about 25 percent of the lubricious polymeric blend; and said medical device having the property of retaining its original dimensional properties after prolonged exposure to hydrophilic liquid.
Claim 3
Dependent Claim
13 words
The medical device according to claim 1 wherein the device is a catheter.
Claim 4
Dependent Claim
24 words
The medical device according to claim 2 wherein the amount of hydrophilic polymer is a is about 50 percent of the lubricious polymeric blend.
Claim 5
Dependent Claim
22 words
The medical device according to claim 3 wherein the lubricious polymeric blend constitutes about 50 percent of the thickness of the laminate.
Claim 6
Dependent Claim
33 words
The medical device according to claim 2 wherein the polymeric blend contains about 50 percent hydrophilic polymer and the laminate is formed of about 50 percent lubricious polymeric blend as the outer layer.
Claim 7
Dependent Claim
23 words
The medical device according to claim 2 wherein said polymeric blend is a blend of ethylene vinyl acetate and poly(ethylene oxide) and polyvinylpyrrolidone.
Claim 8
Dependent Claim
24 words
The medical device according to claim 2 wherein the hydrophilic polymer is selected from the group consisting of polyethylene glycol poly(ethylene oxide) and polyvinylpyrrolidone.
Claim 9
Dependent Claim
15 words
The medical device according to claim 7 wherein the hydrophobic polymer is ethylene vinyl acetate.
Claim 10
Dependent Claim
13 words
The medical device according to claim 7 wherein the hydrophobic polymer is polyethylene.
Claim 11
Dependent Claim
19 words
The medical device according to claim 7 wherein the hydrophobic polymer of the inner layer is high density polyethylene.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-06-06 | 2003-12-06 | 2004-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-06-06 | 2007-12-06 | 2008-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-06-06 | 2011-12-06 | 2012-06-06 | $7700.00 | Window Closed / Lapsed |