PTFE composite multi-layer material
View Patent ↗A composite multi-layer material may generally comprise a d-PTFE material combined with an open structured material (either resorbable or non-resorbable) creating a composite multi-layer material. Attachment of the layers may be accomplished by stitching layers of material, exertion of hydraulic or other pressure, application of a biocompatible adhesive or heat, or some combination of the foregoing. Use of a d-PTFE, unexpanded material has multiple alternative uses, including without limitation, placement on the visceral side of a hernia that may minimize or even eliminate the incidence of abdominal adhesions. Alternatively, the material may be used to create tubing sufficient as a graft for treating abdominal aortic aneurysms.
1. A composite multi-layer material comprising:
a first layer formed from unsintered substantially unexpanded polytetrafluoroethylene polymer having no measurable, repeatable internodal distance, having a density in a range of about 1.2 gm/cc to about 2.3 gm/cc and having a plurality of pores having a nominal channel size of less than 5 micrometers;
a second layer formed from an open structured material, wherein
surfaces of the first and second layers are attached at a common interface; and
a stitching that attaches at least a portion of the first layer to at least a portion of the second layer.
2. The composite multi-layer material of claim 1 , wherein the nominal channel size is less than 2 micrometers.
3. The composite multi-layer material of claim 1 , wherein the nominal channel size is less than 0.5 micrometers.
4. The composite multi-layer material of claim 1 , wherein the nominal channel size is less than 0.2 micrometers.
5. The composite multi-layer material of claim 1 , wherein the first layer has at least one hydrophobic surface.
6. The composite multi-layer material of claim 1 , wherein the first layer has at least one hydrophilic surface.
7. The composite multi-layer material of claim 1 , wherein the open structured material includes unexpanded PTFE.
8. The composite multi-layer material of claim 7 , wherein the open structured material forms a non-woven flatsheet.
9. The composite multi-layer material of claim 7 , wherein the open structured material forms a woven flatsheet.
10. The composite multi-layer material of claim 7 , wherein the open structured material forms a mesh.
11. The composite multi-layer material of claim 1 , wherein the open structured material includes polypropylene.
12. The composite multi-layer material of claim 11 , wherein the open structured material forms a non-woven flatsheet.
13. The composite multi-layer material of claim 11 , wherein the open structured material forms a woven flatsheet.
14. The composite multi-layer material of claim 11 , wherein the open structured material forms a mesh.
15. The composite multi-layer material of claim 1 , wherein the open structured material includes a resorbable polymer.
16. The composite multi-layer material of claim 15 , wherein the open structured material forms a non-woven flatsheet.
17. The composite multi-layer material of claim 15 , wherein the open structured material forms a woven flatsheet.
18. The composite multi-layer material of claim 15 , wherein the open structured material forms a mesh.
19. The composite multi-layer material of claim 1 , wherein the open structured material comprises a non-resorbable polymer.
20. The composite multi-layer material of claim 19 , wherein the open structured material forms a non-woven flatsheet.
21. The composite multi-layer material of claim 19 , wherein the open structured material forms a woven flatsheet.
22. The composite multi-layer material of claim 19 , wherein the open structured material forms a mesh.
23. The composite multi-layer material of claim 1 , further comprising a biocompatible adhesive that attaches the first and second layers.
24. The composite multi-layer material of claim 1 , wherein said composite multi-layer material has a tube structure having in interior surface comprising said first layer and an exterior surface comprising said second layer.
25. The composite multi-layer material of claim 1 , wherein the polytetrafluoroethylene polymer of the first layer has a density in the range of 1.45 gm/cc to 1.55 gm/cc.
26. A device for repairing soft tissue comprising a first and second layer attached to form a flat structure, wherein said first layer comprises unsintered substantially unexpanded polytetrafluoroethylene polymer having no measurable, repeatable internodal distance, having a density in a range of about 1.2 gm/cc to about 2.3 gm/cc and having a plurality of pores with a nominal channel size of less than 5 micrometers and wherein said second layer comprises an open structured material, and wherein a stitching attaches at least a portion of said first layer to at least a portion of said second layer.