Influence of design parameters on the mechanical behavior and porosity of braided fibrous stents

Rebelo, Rita; Vila, Nívea Taís; Fangueiro, Raúl; Carvalho, S.; Rana, Sohel

doi:10.1016/j.matdes.2015.07.051

Cited by 47 publications

(41 citation statements)

References 14 publications

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“…To avoid complications is essential to know the pathology of tumor stenosis, this includes 3 areas: the most stenotic tumor area where there has been obstruction, tumor mass that precedes and follows the proper obstructed area, and part of anterior intestine and distal, which usually has a significant edema. It is therefore necessary to adapt the design of the stent to the different areas that make up an anatomical area affected by the obstructive tumor, and the peristaltic movement of the intestine that precedes and continues to the tumor area, as the technical success of a stent depend directly on mechanical behavior, which can be estimated through predictive simulation model by FEA [22][23][24][25][26][44][45][46][47] or experimentally like in Isayama et al [20] and Rebelo et al [48] for a braiding stent.…”

Section: Discussionmentioning

confidence: 99%

“…However, to the authors' knowledge, in literature no quantitative data may be found to characterize the behavior of the different types of colonic stents. A small number of studies have investigated the influence of design parameters for helical coils [18] and braided stents [9,19] on the mechanical behavior. Experimental bench testing to understand the properties of self-expandable metallic stents for different biliary and airway endoprosthesis have been reported [20,21].…”

Section: Introductionmentioning

confidence: 99%

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A methodology for the customized design of colonic stents based on a parametric model

Puértolas

Navallas

Herrera

et al. 2017

Journal of the Mechanical Behavior of Biomedical Materials

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The choice of necessary stent properties depends mainly on the length of the stenosis and degree of occlusion. So a stent design with variable radial stiffness along its longitudinal axis would be a good option. The design proposed corresponds to a tube-based stent with closed diamond-shaped cells made from a NiTi alloy. By acting independently on different geometric factors, variable geometries can be obtained with different radial force reactions. A design adjustment according to specific requirements, in order to get a better fit to ill-duct and reduces complications, is possible. A parametric analysis using finite element has been conducted to determine the influence of slot length, number of circumferential slots, tube thickness and shape-factor on stent mechanical behavior, which allow eliminating the need for extensive experimental work and knowing and quantifying the influence of those factors. The results of finite element simulations have been used, by means of least-squares fit techniques, to obtain analytical expressions for the main mechanical characteristics of the stent (Chronic Expansive Radial Force and Radial Compression Resistance) in terms of the different geometrical factors. This allows the stent geometry to be customized without launching an iterative and costly process of modeling and simulation for each case.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A methodology for the customized design of colonic stents based on a parametric model

Puértolas

Navallas

Herrera

et al. 2017

Journal of the Mechanical Behavior of Biomedical Materials

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“…The local compression measurement in ISO 25539-2 29 is suitable for both balloon expandable and self-expandable stent-grafts. 24,30,31 In addition, the radial compression property here was measured by a custom-made radial compression instrument (Model LLY-06D, Laizhou Digital Instrument Co., Ltd, Shandong, China) ( Figure 4). The diameter of the press foot was 10 mm with the velocity of 20 mm/min.…”

Section: Testing Methodsmentioning

confidence: 99%

Design and mechanical behaviors of sutureless prototype composite nitinol stent-grafts

Xue

Jing

Wang

et al. 2017

Textile Research Journal

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The stent-graft has always been a key device in endovascular treatments. However, most stents are integrated with graft by sutures, which may fracture or untie, leading to implant failure. This study reports a new sutureless composite stent-graft fabricated by braiding technology, which can combine various materials. The proposed sutureless braided stent-graft was constructed by incorporating bare/covered nitinol (NiTi) yarns into a polyethylene terephthalate multifilament at specific distributions. This technique generates a structure with alternately arranged metal and polymeric sections that equip the stent-graft with structural support and flexibility, respectively. The results showed significantly improved biomechanical performance (radial compression, bending and torsion resistance) of the stent-graft with covered NiTi yarns compared to bare NiTi yarns. This research presents important clinical implications in stent-graft manufacture and provides further study with an innovative stent-graft design.

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“…For tubular braided scaffolds, the cover factor is defined as the percentage of the mandrel's surface covered by yarns and calculated with Eq. (1) [76]:…”

Section: Physical Properties Of Braided Scaffoldmentioning

confidence: 99%

Structural Design, Fabrication and Evaluation of Resorbable Fiber-Based Tissue Engineering Scaffolds

King¹,

Ji-yang²,

Deshpande³

et al. 2019

Biotechnology and Bioengineering

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The use of tissue engineering to regenerate viable tissue relies on selecting the appropriate cell line, developing a resorbable scaffold and optimizing the culture conditions including the use of biomolecular cues and sometimes mechanical stimulation. This review of the literature focuses on the required scaffold properties, including the polymer material, the structural design, the total porosity, pore size distribution, mechanical performance, physical integrity in multiphase structures as well as surface morphology, rate of resorption and biocompatibility. The chapter will explain the unique advantages of using textile technologies for tissue engineering scaffold fabrication, and will delineate the differences in design, fabrication and performance of woven, warp and weft knitted, braided, nonwoven and electrospun scaffolds. In addition, it will explain how different types of tissues can be regenerated by each textile technology for a particular clinical application. The use of different synthetic and natural resorbable polymer fibers will be discussed, as well as the need for specialized finishing techniques such as heat setting, cross linking, coating and impregnation, depending on the tissue engineering application.

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Influence of design parameters on the mechanical behavior and porosity of braided fibrous stents

Cited by 47 publications

References 14 publications

A methodology for the customized design of colonic stents based on a parametric model

A methodology for the customized design of colonic stents based on a parametric model

Design and mechanical behaviors of sutureless prototype composite nitinol stent-grafts

Structural Design, Fabrication and Evaluation of Resorbable Fiber-Based Tissue Engineering Scaffolds

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