In vitro fatigue properties of prototype textile components of endovascular devices

Abstract

The fatigue resistance of twelve tubular textile samples designed for use in prototype endovascular devices was tested by an accelerated fatigue tester. Three time points were selected, namely 0, 26×10 6 , and 100×10 6 cycles, which are equivalent to 0, 10 months, and 38.5 months implanted in the human body. Changes in tubular diameter, woven fabric count, thickness, mass per unit area, porosity, water permeability, and bursting strength were selected to characterize the performance of these samples before and after fatigue testing. The results showed that all the samples experienced some fatigue during the study, and the evidence of fatigue became more apparent with increasing time. There were clearly observable relationships between the textile parameters and the fatigue performance of the prototype samples. Woven construction, yarn size and yarn type all interacted with each other to influence the fatigue performance. Samples with twill weaves fatigued more readily than those with a 1/1 plain weave. For all three woven constructions, samples with larger yarn size fatigued more easily. However, the fatigue performance of some samples with multifilament weft yarns is severe.

Synthesis, Self‐assembly, and Fluorescence Application of Bottlebrush Polyfluorene‐g‐Polycaprolactone with Conjugated Backbone and Crystalline Brushes

“…[ 29 ] Thus, to suppress the aggregation of conjugated groups and enhance photoluminescence efficiencies are also the important ways for exploring the practical application of luminescent materials. [ 30 ]…”

In Vitro Fatigue Properties of Prototype Woven Vascular Prosthesis with Poly (trimethylene terephthalate) Filaments as Circumferential Yarns

“…It is seen from Figure 2 that the changes in porosity of the PTT samples with 75D/72f filament as weft yarns are greater than that with 55D/24f filaments. Filaments inside the multifilament yarns may spread or accumulate under the influence of pulsatile pressure applied on each yarn [13]. The larger the yarn size, the more rigid the sample, and the more easily they creep or deform plastically.…”

“…Intrinsic structural failure of Dacron® prostheses is a late exceptional complication, resulting from a loss of structural integrity of the graft [12]. Zhao et al [13] tested woven PET tubular textile samples by an accelerated fatigue tester in vitro. The results showed that there were clearly observable relationships between the change in textile parameters and fatigue performance of the samples.…”

“…In this study, stress relaxation and elastic recovery properties of yarns were tested and analyzed. Samples of woven vascular prostheses with PTT filaments as circumferential yarns were tested in an accelerated fatigue tester [13]. For comparison purposes, fatigue performances of PET samples were also tested under the same conditions.…”

“…The temperature of fluid (water) inside tubular samples was maintained as 37 ℃. Each sample was tested at two different repeat cycles, 26×10 6 and 100×10 6 , which are equivalent to 10 and 38.5 months implanted inside human body, respectively [13]. Tubular woven samples were fixed over an oversized elastic latex tube to avoid bleeding and to transfer the pressure profile of flowing fluid to the samples.…”