Multi-braid exterior tube
View Patent ↗A multiple braid exterior tube having a composite structure which includes an inner tubular layer, reinforcing layers and a polymer matrix layer. The exterior tube is formed with polymeric materials and metallic reinforcing braiding configured to provide greater tensile strength and stiffness. The exterior tube is used for a variety of medical devices such as a sheath component for intravascular devices and catheters.
1. A sheath component of stent delivery system comprising:
an inner tubular layer having a length and forming a polymeric luminal surface;
at least two distinct braided layers extending the entire length of said inner tubular layer of the delivery system, said braid layers including individual braid wires, one of said at least two distinct braided layers is circumferentially braided at one braid angle over another of said at least two distinct braided layers, said another of said at least two distinct braided layers is circumferentially braided at another braid angle about said inner tubular layer, said one braid angle is different from said another braid angle; and
a polymeric matrix encapsulating said braided layers and joining said braided layers to said inner tubular layer to form said sheath component.
2. The delivery system of claim 1 , wherein said inner tubular layer is a member selected from the group consisting of fluoropolymers, polyesters, polyurethanes, polyolefins, polymethylacetates, copolymers and combinations thereof.
3. The delivery system of claim 1 , wherein said inner tubular layer comprising polytetrafluoroethylene.
4. The delivery system of claim 1 , wherein said polymeric luminal surface provides a lubricous surface.
5. A sheath component of an intraluminal delivery system comprising:
an elongated tubular member having a longitudinal length, said member comprising an inner layer, a first braided layer having a first braid angle circumferentially braided about the inner layer, a second braided layer having a second braid angle circumferentially braided about the first braided layer, the first braided layer and the second braided layer included individual braid wires, said first braid angle and said second braid angle are different, and a polymeric matrix layer joining together said inner layer, first braided layer and second braided layer, said first and said second braided layers extending throughout said longitudinal length of said elongated tubular member of the delivery system, wherein said first braided layer comprises a metal.
6. The delivery system of claim 5 , wherein said inner layer provides a lubricious surface.
7. The delivery system of claim 5 , wherein said inner layer is a member selected from the group consisting of fluoropolymers, polyesters, polyurethanes, polyolefins, polymethylacetates, copolymers and combinations thereof.
8. The delivery system of claim 5 , wherein said inner layer comprising polytetrafluoroethylene.
9. The delivery system of claim 5 , wherein said metal is selected from the group consisting of stainless steel, gold, platinum, metal alloys and combinations thereof.
10. The delivery system of claim 5 , wherein said second braided layer comprises a metal.
11. The delivery system of claim 10 , wherein said metal is selected from the group consisting of stainless steel, gold, platinum, metal alloys and combination thereof.