Non-compliant medical balloon having braided or knitted reinforcement
A non-compliant medical balloon comprises a base balloon including a pair of spaced-apart, generally conical end sections and a generally cylindrical center section connected therebetween. A braided fabric sleeve surrounds at least a portion of the base balloon, wherein the sleeve is formed of at least three substantially inelastic fibers intertwined in such a way that no two of the three fibers are twisted exclusively around one another. The sleeve is permanently affixed to the outer surface of the base balloon so as to prevent excessive expansion of the base balloon when the base balloon is internally pressurized.
1. A non-compliant medical balloon comprising:
a base balloon including a pair of spaced-apart, generally conical end sections and a generally cylindrical center section therebetween; and
a fiber reinforcement layer comprising a plurality of knitted fibers including knit angles therebetween, wherein the fiber reinforcement layer is permanently affixed to the base balloon such that there is substantially no change in the knit angles formed between the fibers when the balloon changes from a deflated state to an inflated state.
2. The medical balloon of claim 1 , wherein the knit angles vary from location to location over a surface of the balloon.
3. The medical balloon of claim 1 , wherein a shoulder is formed at junctures between the generally conical end sections and the generally cylindrical center section.
4. The medical balloon of claim 3 , wherein the plurality of knitted fibers extend across the shoulder at an angle of less than ninety degrees relative to a longitudinal central axis of the base balloon.
5. The medical balloon of claim 1 , wherein the base balloon further includes a pair of cylindrical necks, each of the pair of cylindrical necks extending outwardly from each of the generally conical end sections.
6. The medical balloon of claim 1 , wherein the fiber reinforcement layer comprises a single layer of knitted fibers.
7. The medical balloon of claim 1 , wherein the plurality of knitted fibers comprise a plurality of rows of loops, a first of said rows of loops pulled through a second of said rows of loops below the first of said rows of loops such that each of the knitted fibers is mechanically interlocked by passing over or under an interconnected one of the knitted fibers at a junction.
8. The medical balloon of claim 7 , wherein each of the plurality of knitted fibers changes directions at each junction.
9. The medical balloon of claim 7 , wherein each loop includes a loop length that does not change from the inflated state to the deflated state.
10. The medical balloon of claim 1 , wherein the fiber reinforcement layer comprises a seamless tube.
11. The medical balloon of claim 1 , wherein the fiber reinforcement layer comprises at least one seam.
12. The medical balloon of claim 1 , wherein the knitted fibers comprise one of weft, warp, circular, and flat knit forms.
13. The medical balloon of claim 1 , wherein the base balloon includes a wall with a thickness of 0.0005-0.002 inches.
14. The medical balloon of claim 1 , wherein the fibers are formed of a substantially inelastic material.
15. A method of fabricating a non-compliant medical balloon comprising:
providing a base balloon having a pair of spaced-apart, generally conical end sections and a generally cylindrical center section therebetween; and
attaching a fiber reinforcement layer of knitted fibers to the base balloon such that the knitted fibers form knit angles between said knitted fibers and wherein the knit angle does not change from an inflated state to a deflated state.
16. The method of claim 15 , further including the step of forming a sleeve of the fiber reinforcement layer and enveloping the base balloon with the sleeve.
17. The method of claim 15 , further including the step of knitting the fibers over the base balloon to form the fiber reinforcement layer.