Mechanisms of Rupture of Knitted Polyester Vascular Prostheses: An In vitro Analysis of Virgin Prostheses

Abstract

Rupture of knitted polyester prostheses are probably an underestimated phenomenon. They may occur at specific areas of the graft. Further studies are required to determine whether all grafts of this type are at risk.

Characterization of polyelectrolyte multilayer films on polyethylene terephtalate vascular prostheses under mechanical stretching

“…highlighted modifications of the mechanical behavior of monofilaments after the manufacturing of the PET knitted prosthesis. 30 It is important to emphasize here that no significant difference of the rupture force was observed between the untreated group (0.09 6 0.01 N) and the three treated groups (PAH/ PSS) 24 (0.08 6 0.01 N), (PLL/HA) 24 (0.1 6 0.007 N) and (PLL/PGA) 24 (0.1 6 0.01 N) (6 represent the standard deviation). We can conclude that the LBL films had no influence on the mechanical properties of the filament, whatever the coating applied [(PAH/PSS) 24 , (PLL/HA) 24 and (PLL/PGA) 24 ].…”

“…The properties of the textile and the coating could be assessed by micromechanical tests, using classical dynamometry in longitudinal direction. 30 Recently, Hemmerlé et al investigated the variation of the hydrophilic properties of polyelectrolyte multilayer films deposited on modified silicone sheets, which were then submitted to successive elongation/retraction cycles. 31 Here, to perform observation in an aqueous environment, we developed an original model to test unidirectional longitudinal stretch, by direct imaging with environmental scanning electronic microscopy (ESEM), and to follow the microstructural behavior of the multilayer film coated onto poly(ethylene terephtalate) samples.…”

Explanted Vascular and Endovascular Graft Analysis: Where Do We Stand and What Should We Do?

“…Chemical and mechanical analysis showed that degradation was due to the process of dyeing itself, which modified the macromolecular structure of the polymer. 16 Explant examination with ruptures on the remeshing line showed that filaments were completely broken with transverse fractures, particularly on the external surface of the graft where the velour sometimes completely disappeared. 15 Subsequent investigations revealed that degradation of the re-meshing line yarns was related to important physical stress applied to the yarns in this specific area.…”

“…15 Subsequent investigations revealed that degradation of the re-meshing line yarns was related to important physical stress applied to the yarns in this specific area. 16 Further studies using filament dynamometry were performed on both areas of weakness: mechanical behaviour of the filaments inside the same yarn was heterogenic, characterised by major differences in terms of resistance and breaking extension. Moreover, there were differences in mechanical behaviour of the filaments according to the area from where the yarns were extracted.…”

Promising Poly(ε-caprolactone) Composite Reinforced with Weft-Knitted Polyester for Small-Diameter Vascular Graft Application

“…However, the mechanical properties of this material cannot comply with vascular graft requirements [19,20]. Textile fabric parameters, such as fabric design and yarn properties, influence the properties of vascular prostheses (porosity, permeability, and mechanical performances) [21,22]. In this study, tubular PCL reinforced with different PET-knitted fabric structures to form multilayer composites is considered as a novel biomedical material for preparing vascular grafts.…”