Multiple layer high strength balloon for dilatation catheter
First Claim
1. A balloon dilatation catheter having a balloon, at least a portion of said balloon comprising at least two layers of the same inelastic, biaxially oriented, polymeric material composition, the catheter having an inflation lumen therein and the interior of the balloon being in fluid communication with the inflation lumen.
2 Assignments
0 Petitions
Accused Products
Abstract
A multilayer high strength balloon for a dilation catheter is provided. The balloon comprises a plurality of balloon layers, including an inner layer which has a cylindrical midportion, a cone at each end, and necks at the ends of the cones, and at least one additional layers which have the cylindrical midportions and cones. Each layer is formed from an inelastic, polymeric material, and perhaps an inelastic, biaxially oriented, thermoplastic material. Preferably, one or more of the balloon layers is blow molded and stretched to biaxially orient the material to form a very high strength layer. The multilayer balloon resulting from the plurality of balloon layers, of which one or more has been biaxially oriented, is stronger than a single layer balloon of the same finished diameter which has been made from the same material with comparable thickness. The composite high strength balloon may be formed to eliminate undesirable thickening of the cone regions of conventional blow molded balloon designs by stepping the cone regions so that they are not substantially greater than the wall thickness in the midportion of the balloon. The resulting balloon is better adapted to collapse to a low profile about the catheter shaft on which it is mounted.
293 Citations
27 Claims
- 1. A balloon dilatation catheter having a balloon, at least a portion of said balloon comprising at least two layers of the same inelastic, biaxially oriented, polymeric material composition, the catheter having an inflation lumen therein and the interior of the balloon being in fluid communication with the inflation lumen.
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17. A multilayer balloon for use in a balloon dilatation catheter, at least a portion of said balloon comprising at least two layers, each layer being formed from an inelastic orientable polymeric material composition, each said layer being stretched radially, close to the maximum achievable radial expansion for the material under the process conditions used, to result in a highly oriented layer, wherein each of said layers is formed from the same polymeric material composition.
- 18. A multilayer balloon for use in a balloon dilatation catheter, at least a portion of said balloon comprising at least two layers formed from the same inelastic, orientable polymeric material composition, at least one of said layers being stretched radially, close to the maximum achievable radial expansion for the material under the process conditions used, to result in a highly oriented layer.
Specification