Medical balloon with incorporated fibers
A balloon catheter assembly comprises a balloon having attached to or in its wall one or more filar elements, extending from one end of the balloon to the other. The filar elements are made of a material which is at least as flexible as the material forming the walls of the balloon. In the event of circular burst of the balloon, the filar element(s) prevent disconnection of the material of the balloon into two or more separate pieces. The filar element(s) become attached to or in the material of the balloon wall when the raw material is inflated to the shape of a mold. The filar elements may comprise a natural fiber, a synthetic fiber or a metal wire.
1. A balloon catheter assembly, comprising:
a catheter;
an inflatable balloon having a longitudinal direction and comprising a balloon wall made from at least one balloon material and provided with a body portion, first and second end cones, and first and second neck portions, which neck portions are attached to the catheter, the balloon material having only two layers, an outer layer of a first material and an inner layer of a second material, wherein a softening or melting temperature of the first material is lower than a softening or melting temperature of the second material; and,
one or more filar elements at least partially embedded in the outer layer but not the inner layer, wherein the one or more filar elements extend solely in the longitudinal direction of the balloon from the first neck portion to the second neck portion, and there are no filar elements that extend circumferentially around the balloon in an annular manner when the balloon is configured for delivery and subsequent deployment, and wherein the one or more filar elements are at least as flexible in a longitudinal direction as the balloon wall.
2. An assembly according to claim 1 , wherein the one or more filar elements are at least as flexible as the balloon wall.
3. An assembly according to claim 1 , wherein the one or more filar elements provide no material scoring or abrading function.
4. An assembly according to claim 1 , wherein the one or more filar element or elements are compressible.
5. An assembly according to claim 1 , wherein the balloon wall has a thickness of between about 0.005 millimeters and about 0.080 millimeters.
6. An assembly according to claim 1 , wherein the one or more filar element has a diameter of between around 0.04 millimeters and 0.05 millimeters.
7. An assembly according to claim 1 , wherein the one or more filar element has a linear density (dtex) of between 40 and 60.
8. An assembly according to claim 1 , wherein the one or more filar element is multi-filamentary, each having from around 5 to 50 strands per element.
9. An assembly according to claim 8 , wherein the one or more filar element has around 25 strands.
10. An assembly according to claim 8 , wherein each strand has a density of around 0.5 to 2 denier.
11. An assembly according to claim 1 , wherein the one or more filar element has a tensile strength of between around 4N to around 20N.
12. An assembly according to claim 1 , wherein the one or more filar element exhibits an elongation at break of no more than around 5%.
13. An assembly according to claim 1 , wherein the one or more filar element is at least one of: completely embedded in the balloon wall and partially embedded in the balloon wall.
14. An assembly according to claim 1 , wherein the one or more filar material comprises natural and/or synthetic fiber.
15. An assembly according to claim 14 , wherein the one or more filar material comprises as least one of: para-aramid synthetic fiber, ultra-high molecular weight polyethylene, polytetrafluoroethylene fiber, carbon fiber, and cotton.