Angioplasty super balloon fabrication with composite materials
View Patent ↗The balloon catheter comprises a plastic tubing, a balloon fused to one end portion of said tubing, and the balloon being made of a polymer and one of a carbon nano-tube material, a nano-clay material or a nano-ceramic fiber material.
1. A balloon for use in a balloon catheter including a tubing, said balloon having a high strength for resisting bursting during over inflation, and said balloon comprising a blended nano-composite reinforced polymer matrix consisting essentially of a polymer selected from nylon 12 or PET and a nano composite selected from carbon nano-tubes or nano-ceramic fibers together with a lubricant to aid dispersion of the nano composite during blending of the matrix, said polymer and nano composite matrix being formed by controlling the volume or weight percent of nano composite in the matrix relative to the polymer such that the nano composite is between 0.20% and 20% by weight of the matrix and the polymer is between 80% and 99.80% of the matrix, by controlling the “wetting” of the nano composite in the matrix; and by controlling the orientation of the nano tubes or nano ceramic fibers within the matrix that is formed into a tube which is blow molded into said balloon wherein the nano-tubes or ceramic fibers are oriented along the axis of the balloon or tangentially in the wall of the tube.
2. The balloon of claim 1 being formed by extruding a polymer and nano composite matrix into a thin wall tube that is subsequently heat stretched in a controlled manner to further reduce a wall thickness of the tube to desired dimensions, followed by blow molding the stretched tube into a desired balloon shape.
3. The balloon of claim 1 wherein the polymer and nano composite matrix is formed by dispersing the nano composite to a monomer matrix followed by polymerization of the monomer and nano composite matrix.
4. The balloon of claim 1 wherein the polymer and nano composite matrix is formed by dispersing the selected nano composite in the matrix during melt compounding of the matrix.
5. The balloon of claim 1 being fused to one end of a tubing of a balloon catheter.
6. The balloon of claim 5 wherein said balloon comprises between 99.75 and 90.00% by weight polymer and between 0.25 and 10 by weight carbon nano-tubes.
7. The balloon of claim 6 wherein said balloon comprises approximately 3% by weight carbon nano-tubes.
8. The balloon of claim 5 wherein said nano composite is a nano-ceramic fiber.
9. The balloon of claim 8 wherein said balloon comprises between 99.75 and 90.00% by weight polymer and between 0.025 and 10.00% by weight nano-ceramic fibers.
10. The balloon of claim 9 comprising approximately 3% by weight nano-ceramic fibers.
11. The balloon of claim 8 wherein said nano-ceramic fibers are alumina fibers.
12. The balloon of claim 1 being formed by cutting a polymer and nano composite sheets of specific thickness, fusing the sheets into tubes whose wall thickness is considerably greater than necessary for making the balloon followed by drawing down the tubes formed by the laminated sheets to desired dimensions to form a thermoplastic tube and forming the balloon by heating the thermoplastic tube made from the laminated sheets under internal pressure within blow molding.
13. The balloon of claim 12 wherein the stretched tubes are formed with the nano-tubes or nano ceramic fibers oriented primarily along the axis of the balloon.