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Elastomeric balloon support fabric

A technology for elastic fabrics and balloon catheters, applied in the field of manufacturing such fabrics, elastomer sleeves or balloon covers, can solve the problems of increasing the volume of the cover, less edges and corners, and limiting the flexibility of the balloon, and achieves increased volume, good elastic balance, and improved reproducibility. walkthrough effect

Inactive Publication Date: 2004-05-05
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Although the "airbag covers" described in the Campbell et al. patents have fewer edges and corners, have good tracking properties, and can be inflated to provide stress support for the airbag, they still leave various problems to be solved
Specifically, they appear to a) expand in the circumferential direction, contract in the longitudinal direction, and increase in length as they contract, and b) require an externally applied mechanical action (e.g., longitudinal elongation) in order for the balloon to either deflate or collapse , c) apply an elastic layer on the cover to facilitate re-contraction and thus increase the volume of the cover, d) limit the flexibility of the airbag

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Elastomeric balloon support fabric
  • Elastomeric balloon support fabric
  • Elastomeric balloon support fabric

Examples

Experimental program
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Effect test

example 1

[0097] Table II Fabric Design Calculated Values

[0098] Variable Unit Value Variable Name Formula

[0099] Minimum sleeve diameter mm 1.0 Dmin = d*100 / e

[0100] Circumferential Stress lb / in 22.4 Sh =(p*d / 2) / 25.4

[0101] Longitudinal Stress lb / in 11.2 Sa = Sh / 2

[0102] Circumferential strength / yarn lb .128 Syh = gpd*denY*eff / 454

[0103] Machine direction tenacity / yarn lb .357 Sya = gpd_w*denY_w*eff_w / 454

[0104] Minimum yarn / inch-circumferential (maximum 1 / inch 175 Yh = Sh / Syh

[0105] diameter)

[0106] Minimum yarn / inch - machine direction (maximum 1 / inch 31 Ya = Sa / Sya

[0107] diameter)

[0108] The minimum number of axial directions on the braid 15 Na =Ya*d*pi(π) / 25.4

[0109] yarn

[0110] Knitting yarn (circumferential direction)

[0111] Yarn Diameter (Solid Rod Equivalent) inches .0041 Dys = .000468*SQRT(denY / rho)

[0112] Yarn diameter (circle equivalent) inches .0041 Dy = Dys / SQRT(phi)

[0113] Yarn Thickness inches .0041 Ty = Dy / SQRT(a)

[0114]...

example 3

[0201] Example 3 Method of Braiding Elastic Fabric Directly on Inflatable Balloon Catheter

[0202] fabric description

[0203] The yarns in this fabric are woven into tubular geometric shapes. 16 axial yarns are arranged longitudinally and these yarns are interwoven with 2 braiding yarns. The weaving yarns lie on opposite helical paths, the weaving yarns being nearly perpendicular to the longitudinal axis. There are approximately 254 braiding yarns per inch of tube length. The diameter of the braid varies between about 1-4 mm depending on the internal pressure, while the length of the braid remains substantially constant.

[0204] yarn material

[0205] The axial yarns consisted of polyester fibers (40 denier, 27 filaments). These yarns are generally inextensible with an elongation to break of 27%. On the other hand, the braided yarn is composed of highly elastic fibers with a breaking elongation of 600%.

[0206] Highly elastic fiber yarns have high recovery from any ...

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Abstract

Balloon catheter covers are elastic fabric structures of interconnected yarns, the structure having a high degree of stretch and recovery in the circumferential direction with little change in dimension in the longitudinal direction during multiple pressurization cycles over full range of inflation and deflation of the balloon catheter. The covers have longitudinal yarns positioned at about zero degrees to the balloon axis and reversibly-stretchable, circumferential yarns positioned at a high angle O to the axis. A method for making the balloon catheter covers allowing nearly orthogonal placement of circumferential and longitudinal yarns involves triaxial braiding a minimum number of elastomeric braid yarns with multiple axial yarns to provide maximum convergence angle (approaching 90 degrees).

Description

technical field [0001] This invention relates to balloon catheters used in various surgical procedures, and more particularly to elastomeric balloon support fabrics used to form elastomeric cuffs or balloon covers for use with balloon catheters. The invention also relates to methods of making such fabrics. Background technique [0002] Various forms of balloon catheters are commonly used in many surgical procedures. These devices consist of a thin catheter, which can be introduced into a patient's internal tube, such as a blood vessel, and an expandable balloon, which is located at the distal end of the catheter. The balloon can be operated using a fluid-filled syringe or similar device that fills the balloon with a fluid (such as water or saline) that inflates the balloon to the desired extent and then withdraws the fluid back into the syringe to deflate the balloon. [0003] In application, the doctor introduces the balloon catheter to the desired location, then inflates...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/958A61L29/08A61L29/12A61M25/00A61M25/10D04C1/06
CPCD04C1/06A61M2025/1084A61M2025/1075A61M25/1027A61L29/12A61M2025/1031A61L29/085A61M25/10D04C3/48D10B2401/061D10B2403/02411D10B2509/06Y10T428/139
Inventor S·L·萨米尔斯P·波佩W·G·迪麦奥
Owner EI DU PONT DE NEMOURS & CO
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