Claims
- 1. A composite multilayer implantable structure comprising:
a first inner tubular layer and second outer tubular layer formed of expanded polytetrafluoroethyene having a porous microstructure defined by nodes interconnected by fibrils, said first and second layers having a support structure positioned therebetween; a third tubular layer formed of textile material circumferentially disposed exteriorly to said first and second layers; and an elastomeric bonding agent applied to one of said second layer or third layer and disposed within the pores of said microstructure for securing said second layer to said third layer.
- 2. A composite structure of claim 1 wherein said bonding agent is applied to one surface of said second layer.
- 3. A composite structure of claim 1 wherein said bonding agent is applied to a surface of said third textile layer.
- 4. A composite structure of claim 1 wherein said bonding agent is selected from the group consisting of urethanes, styrene/isobutylene/styrene block copolymers, silicones and combinations thereof.
- 5. A composite structure of claim 1 wherein said third layer comprises a textile pattern selected from the group comprising knits, weaves, stretch-knits, braids, any non-woven process, and combinations thereof.
- 6. A composite structure of claim 2 wherein said third layer is placed in contact with said one surface of said second layer.
- 7. A composite structure of claim 1 wherein said support structure comprises a stent.
- 8. A composite structure of claim 1 wherein said implantable structure includes said first layer being a blood contact layer and said third layer being a tissue contacting layer.
- 9. A composite structure of claim 1 wherein said first, second and third tubular layers form an elongate tubular vascular graft.
- 10. A composite structure of claim 9 wherein said graft includes a plurality of longitudinally spaced crimps therealong.
- 11. A composite structure of claim 9 wherein said graft is helically wrapped with a monofilament externally therearound.
- 12. A composite structure of claim 11 wherein said monofilament comprises polypropylene.
- 13. A composite structure of claim 12 wherein said monofilament is attached by heat bonding.
- 14. A composite structure of claim 11 wherein said graft includes an external support coil helically positioned thereover.
- 15. A composite structure of claim 1 wherein said elastomeric bonding agent is applied to said second layer in solution.
- 16. A composite structure of claim 15 wherein said solution includes dimethylacetamide.
- 17. A composite structure of claim 1 further comprising a fourth tubular layer formed of textile material circumferentially disposed interiorly to said first and second layers; and
an elastomeric bonding agent applied to one of said first layer or said fourth layer and disposed within the pores of said microstructure for securing said first layer to said fourth layer.
- 18. A method of forming a textile ePTFE composite graft comprising:
providing a first tubular ePTFE structure having a microporous structure of nodes interconnected by fibrils; providing a second tubular ePTFE structure having a microporous structure of nodes interconnected by fibrils; providing a tubular textile structure; placing a tubular support structure circumferentially around said first ePTFE tubular structure; placing said second tubular ePTFE structure circumferentially around said tubular support structure; applying a coating of an elastomeric bonding graft to a surface of said second ePTFE structure or said textile structure; and securing said coated liner surface to said textile structure.
- 19. A method of claim 18 wherein said tubular textile structure defines an inner and outer surface.
- 20. A method of claim 19 wherein said first and second ePTFE tubular structures are applied to said inner surface of said textile structure.
- 21. A method of claim 18 wherein said bonding agent is applied to one surface of said second ePTFE structure.
- 22. A method of claim 21 wherein said bonding agent is selected from the group consisting of urethanes, styrene/isobutylene/styrene block copolymers, silicones, and combinations thereof.
- 23. A method of claim 18 wherein said textile structure is formed by a process selected from the group consisting of knitting, weaving, stretch-knitting, braiding, any non-woven process, and combinations thereof.
- 24. A method of claim 18 wherein said support structure comprises a stent.
- 25. A method of claim 21 wherein said elastomeric bonding agent is applied to said one surface in solution.
- 26. A method of claim 25 wherein said solution includes dimethylacetamide.
- 27. A method of claim 18 further comprising the following steps:
applying an elastomeric bonding agent to an interior surface of said first ePTFE tubular structure; and placing a fourth tubular structure formed of textile material circumferentially interior to said first and second ePTFE tubular layers, bonding said layers together.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] The present application claims priority to U.S. Provisional Application No. 60/297,401. The present application is being concurrently filed with Attorney docket number 498-268, claiming priority to the same application, and herein incorporated by reference.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60297401 |
Jun 2001 |
US |