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Non-shortening wrapped balloon

a balloon and non-shortening technology, applied in the field of balloon catheters, can solve the problems of compensation for foreshortening and unreliable placement of balloons in vessels, and achieve the effects of increasing burst pressure, increasing burst pressure, and reducing the thickness of the film

Inactive Publication Date: 2008-06-12
WL GORE & ASSOC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]A non-shortening wrapped catheter balloon having a longitudinal axis, comprising a first balloon material layer fused to a second balloon material layer is provided, wherein the first balloon material is oriented at an angle of less than or equal to about 55 degrees and the second balloon material is oriented at an opposing angle of less than or equal to about 55 degrees with respect to the longitudinal axis. These opposing angle layers create a balloon preform.
[0009]A method of creating a non-shortening catheter balloon with increased burst pressures is provided, said balloon comprising: wrapping a mandrel with an anisotropic film at a low angle to form a balloon preform; removing the mandrel; exposing the balloon preform to internal pressure at a temperature to soften or a melt point for the film or imbibing material; and inflating the balloon preform into a balloon as it is continued to be exposed to said internal pressure at an increased temperature.
[0010]A method of creating a non-shortening catheter balloon with increased burst pressures

Problems solved by technology

However, previous wrapped balloons have suffered from problems such as overexpansion during inflation and shortening of the balloon due to inflation resulting in unreliable placement of the balloon in a vessel.
Compensation for foreshortening by means of accordion-scrunching-length-storage is limited in that the longitudinal folds push out and then the angle moves to the neutral angle thus the foreshortening is not eliminated during inflation.

Method used

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Examples

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Effect test

example 1

[0044]The ePTFE membrane used to make the composite film was made in accordance with the teaching in U.S. Pat. No. 5,476,589 to Bacino. Specifically, the ePTFE membrane was longitudinally expanded to a ratio of 55 to 1 and transversely expanded approximately 2.25 to 1, to produce a thin strong membrane with fibrils oriented substantially in the longitudinal direction, and a mass of approximately 3.5 g / m̂2 and a thickness of approximately 6.5 micrometers.

[0045]The composite film was made by using a saturation coating process whereby a solution of Tecothane TT-1085A polyurethane and tetrahydrofuran (THF) was coated onto the ePTFE membrane using a wire-wound rod coating process. A 3% to 8% by weight solution of Tecothane TT-1085A polyurethane in THF was saturation coated onto the ePTFE membrane to produce a composite film with approximately equal amounts of Tecothane TT-1085A polyurethane on either side of the ePTFE membrane and a total polymer weight application of approximately 50% t...

example 2

[0046]A mechanically balanced composite film was made by using a wire-wound rod coating process whereby a solution of Tecothane TT-1085A polyurethane and tetrahydrofuran (THF) was coated onto an ePTFE membrane. The ePTFE membrane used to make the composite film was made in accordance with the teachings of U.S. patent application Ser. No. 11 / 334,243. Specifically, the ePTFE membrane was longitudinally expanded to a ratio of 15 to 1 and transversely expanded approximately 28 to 1, to produce a thin strong membrane with a mass of approximately 3.5 g / m2 and a thickness of approximately 8 micrometers. A 3% to 8% by weight solution of Tecothane TT-1085A polyurethane in THF was coated onto the ePTFE membrane to produce a composite film with Tecothane TT-1085A polyurethane on one side of the ePTFE membrane and throughout the ePTFE membrane, and a total polymer weight application of approximately 40% to 60% of the total final composite film weight.

example 3

[0047]A mechanically balanced composite film was made by using a saturation coating process whereby a solution of Tecothane TT-1085A polyurethane and tetrahydrofuran (THF) was coated onto an ePTFE membrane using a wire-wound rod coating process. The ePTFE membrane used to make the composite film was made in accordance with the teachings in Example (2). Specifically, the ePTFE membrane was longitudinally expanded to a ratio of 15 to 1 and transversely expanded approximately 28 to 1, to produce a thin strong membrane with an mass of approximately 3.1 g / m2 and a thickness of approximately 8 micrometers. A 3% to 8% by weight solution of Tecothane TT-1085A polyurethane in THF was saturation coated onto the ePTFE membrane to produce a composite film with approximately equal amounts of Tecothane TT-1085A polyurethane on either side of the ePTFE membrane and a total polymer weight application of approximately 40% to 50% of the total final composite film weight.

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PUM

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Abstract

A non-shortening catheter balloon having a longitudinal axis and an inflatable balloon able to be affixed to a catheter shaft is provided. The balloon has an uninflated length which remains relatively unchanged upon inflation and is formed of least two helically oriented wrapped passes of balloon materials at a balanced force angle. Methods of making this balloon are also provided.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to balloon catheters and, more particularly, to a non-shortening wrapped balloon configured to expand with essential radial symmetry to a predetermined diameter upon application of a predetermined pressure thereto.[0002]Balloon catheters are well known in the art. Such catheters are employed in a variety of medical procedures, including dilation of narrowed blood vessels, placement of stents and other implants, and temporary occlusion of blood vessels.[0003]In a typical application, the balloon is advanced to the desired location in the vascular system. The balloon is then pressure-expanded in accordance with a medical procedure. Thereafter, the pressure is removed from the balloon, allowing the balloon to contract and permit removal of the catheter. The balloon must be formed of a material which has a low profile to allow entry through a vessel, yet is readily pressure-expanded and able to contract upon removal of the i...

Claims

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Application Information

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IPC IPC(8): A61M25/00A61F2/06
CPCA61M25/10A61M25/1029A61M25/1034A61F2/958A61M2025/1075A61M2025/1086A61M2025/1004
Inventor ESKAROS, SHERIFKING, DAVID R.KORLESKI, JOSEPH E.MCLAUGHLIN, LONZO C.NEWCOMB, KENNETHROEBER, PETER J.STREETER, JOHNTOWLER, JEFFREY
Owner WL GORE & ASSOC INC
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