EP0473694B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Non-porous coated ptfe graft
Assignee: Bard Peripheral Vascular Inc
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Filing: 1990-05-25
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Granted: 1995-12-13
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Expires: 2010-05-25
Abstract
Abstract A non-porous coated PTFE graft (20) includes a PTFE tube (32) having a conventional porous inner cylindrical wall (34) and a non-porous elastomeric coating (38) applied over at least a portion of the outer cylindrical wall (36) of the PTFE tube to render such portion of the outer cylindrical wall non-porous. The elastomeric coating is made of polyurethane or another biocompatible non-porous elastomer and precludes tissue ingrowth into the outer cylindrical wall, minimizes suture hole bleeding, and increases suture retention strength, while reducing the incidence of serious weepage. The elastomeric coating is preferably applied by mounting the PTFE tube upon a mandrel (68) of like diameter and either dip coating or spray coating all, or selected portions, of the PTFE tube with liquified polyurethane. After the polyurethane coating is completely dried, the non-porous vascular graft is removed from the mandrel and is ready for use.
Inventors
- 👤 Rajagopal R. Kowligi
- 👤 Robert Charles Farnan
- 👤 William Michael Colone
- 👤 Linda V. Della Corna
- 👤 Joseph Brian Sinnott
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 13:09
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/50; A61L27/507; A61F; A61F2/00; A61F2/02; A61F2/04; A61F2/06; A61L27/14; A61L27/16; A61L27/28; A61L27/34
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
71 words
An implantable vascular graft (20) comprising: a. an expanded, porous PTFE tube (32) having inner and outer cylindrical walls (34, 36); and b. a non-porous coating (38) of a non-porous elastomer applied over at least a portion of the outer cylindrical wall (36) of said PTFE tube (32), characterized in that said coating (38) has a substantially uniform thickness, so as to provide an outer surface which precludes tissue ingrowth .
Claim 2
Dependent Claim
21 words
The implantable vascular graft (20) recited by Claim 1 wherein said non-porous elastomer coating (38) is a coating of non-porous polyurethane.
Claim 3
Dependent Claim
31 words
The implantable vascular graft (20) recited by Claim 1 wherein said elastomer is selected from the group of elastomers consisting of medical-grade silicone rubber elastomers, segmented polyurethanes, polyurethane-ureas, and silicone-polyurethane copolymers.
Claim 4
Dependent Claim
118 words
An implantable vascular graft (20) comprising an expanded, porous PTFE tube (32), characterized in that a. the PTFE tube (32) has inner and outer cylindrical walls (34, 36), and has first and second opposing end portions (24, 26) and a central portion lying between said first and second opposing end portions; and b. a coating (38) of substantially uniform thickness of a non-porous elastomer is applied over the outer cylindrical wall (36) of said PTFE tube (32) along said first and second opposing end portions (24, 26) but not along the central portion of said PTFE tube, so as to provide an outer surface along said first and second opposing end portions (24, 26) which precludes tissue ingrowth.
Claim 5
Dependent Claim
21 words
The implantable vascular graft (20) recited by Claim 4 wherein said non-porous elastomer coating (38) is a coating of non-porous polyurethane.
Claim 6
Dependent Claim
31 words
The implantable vascular graft (20) recited by Claim 4 wherein said elastomer is selected from the group of elastomers consisting of medical-grade silicone rubber elastomers, segmented polyurethanes, polyurethane-ureas, and silicone-polyurethane copolymers.
Claim 7
Independent Claim
114 words
A method of producing a PTFE vascular graft (20) having a porous inner cylindrical wall and having an outer cylindrical wall, at least a portion of which outer cylindrical wall is non-porous, said method comprising the steps of: a. providing a porous PTFE tube (32,66) having a predetermined internal diameter and including inner and outer cylindrical walls (34,36); b. coating a liquified elastomer upon at least a portion of the outer cylindrical wall (36) of the tube, so as to provide an outer non-porous layer of substantially uniform thickness which layer thus precludes tissue ingrowth; and c. drying the coating (38) of liquified elastomer upon the outer cylindrical wall (36) of the tube (32).
Claim 8
Dependent Claim
43 words
The method recited by Claim 7 further including the step of pulling the PTFE tube (32,66) over a cylindrical mandrel (68) having an outer diameter of approximately the same dimension as the internal diameter of the PTFE tube, prior to said coating step.
Claim 9
Dependent Claim
42 words
The method recited by Claim 8 wherein said coating step includes the step of dip coating at least a portion of the PTFE tube (32,66) within a container of the liquified elastomer while said PTFE tube is supported upon the mandrel (68).
Claim 10
Dependent Claim
47 words
The method recited by Claim 8 wherein said coating step includes the step of spraying the liquified elastomer upon the outer cylindrical wall of the PTFE tube (32,66) over at least a portion of the PTFE tube while the PTFE rube is supported upon the mandrel (68).
Claim 11
Dependent Claim
28 words
The method recited by Claim 7 wherein the elastomer is selected from the group of elastomers consisting of medical-grade silicone rubber elastomers, segmented polyurethanes, polyurethane-ureas, and silicone-polyurethane copolymers.
Claim 12
Dependent Claim
32 words
The method recited by Claim 7 wherein said coating step includes the step of applying a coating of the liquified elastomer to the entire outer cylindrical wall of the PTFE tube (32,66).
Claim 13
Dependent Claim
50 words
The method recited by Claim 7 wherein the PTFE tube (32,66) includes first and second opposing end portions (42,44), and wherein said coating step includes the step of applying the liquified elastomer over the outer cylindrical wall of the PTFE tube only along the first and second opposing end portions.
References Cited (Backward Citations)
US4306318A
Cited
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