Polymer shrink tubes and novel uses therefor
View Patent ↗Novel polymer shrink tubes, such as fluoropolymer shrink tubes and novel uses thereof. The polymer shrink tubes include at least one three-dimensional pattern formed along at least a portion of the inner surface of the tube. The polymer shrink tubes can be used for, for example, embossing a pattern into a polymer tube. Further use includes, for example, forming a catheter with at least one channel located in the catheter wall.
1. A method for forming a catheter having a proximal end and a distal end comprising the steps of:
providing a fluoropolymer tube having a proximal end, a distal end, an inner surface defining a longitudinally extending, generally central lumen, and an outer surface;
providing an outer polymer tube having a proximal end, a distal end, an inner surface, and an outer surface, wherein the inner surface of the outer polymer tube is positioned over the outer surface of the fluoropolymer tube;
providing a polymer shrink tube having a proximal end, a distal end, an inner surface, and an outer surface, the inner surface having at least one three-dimensional pattern thereon;
placing the polymer shrink tube around the outer polymer tube, with the polymer shrink tube inner surface adjacent the outer surface of the outer polymer tube;
applying sufficient energy to the shrink tube so as to shrink the shrink tube around the outer polymer tube, causing at least a portion of the at least one three-dimensional pattern to become embossed into the outer polymer tube;
removing the polymer shrink tube; and
covering at least a portion of the at least one three-dimensional pattern with polymer film.
2. The method of claim 1 , wherein the at least one three-dimensional pattern includes at least one rib that embosses at least one channel into the outer polymer tube.
3. The method of claim 2 , wherein the at least one channel is a longitudinally extending channel.
4. The method of claim 3 , further comprising placing a reinforcing material in contact with the outer polymer tube prior to applying sufficient energy.
5. The method of claim 4 , wherein the reinforcing material comprises metal.
6. The method of claim 5 , wherein the metal is selected from the group consisting of stainless steel and nitinol.
7. The method of claim 4 , wherein the metal is a coil construction.
8. The method of claim 4 , wherein the reinforcing material is embedded by the outer polymer tube during the step of applying sufficient energy.
9. The method of claim 3 , wherein the at least one longitudinally extending channel measures about 0.007 inch by about 0.015 inch.
10. The method of claim 3 , wherein an expandable member is located at the distal end of the catheter and the at least one longitudinally extending channel is in fluid communication with the interior of the expandable member.
11. The method of claim 10 , wherein the expandable member is an occlusion balloon.
12. The method of claim 1 , wherein the polymer film comprises a material selected from the group consisting of polytetrafluoroethylene, polyethylene, polypropylene, polyamide, polyethylene terephthalate, fluorinated ethylene propylene, perfluoroalkoxy resin, polyurethane, polyester, and polyimide.
13. The method of claim 12 , wherein the polytetrafluoroethylene is porous, expanded polytetrafluoroethylene.
14. The method of claim 13 , wherein the polymer film further comprises at least a second polymer.
15. The method of claim 14 , wherein the second polymer is provided by at least one of the following methods, coating, imbibing, vacuum assisted coating, nip coating, and dip coating.
16. The method of claim 14 , wherein the second polymer is imbibed into at least some of the porosity of the expanded polytetrafluoroethylene.
17. The method of claim 14 , wherein the second polymer is provided as at least a partial surface coating to one or more sides of the expanded polytetrafluoroethylene film.
18. The method of claim 16 , wherein substantially all of the porosity of the expanded polytetrafluoroethylene is imbibed with the second polymer.
19. The method of claim 14 , wherein the second polymer is selected from the group consisting of thermoplastics, thermosets, pressure sensitive adhesives, heat-activated adhesives, chemically-activated adhesives, and UV-curable polymers.
20. The method of claim 19 , wherein the second polymer is selected from the group consisting of ethylene tetra fluoro ethylene based copolymers and UV-curable polymers.
21. The method of claim 20 , wherein the second polymer is UV-curable.
22. The method of claim 20 , wherein the outer polymer tube is selected from the group consisting of polyether block amides, nylon, urethanes, polyethylene, polypropylene, and fluorinated ethylene propylene.
23. The method of claim 20 , wherein the outer polymer tube comprises at least polyether block amide.
24. The method of claim 3 , wherein four longitudinally extending channels are formed in the outer polymer tube.
25. The method of claim 24 , wherein the four longitudinally channels are each about 90 degrees apart.
26. The method of claim 25 , wherein each of the four longitudinally extending channels has a width of about 0.015 inch and a depth of about 0.007 inch.