The impacts of thermal treatments on the physical properties of textile vascular prostheses

Development of a test bench assessing the hydrodynamic compliance of vascular prostheses

“…They illustrate the ability of prosthetic tubes to dilate throughout fatigue cycles in the chosen pressure range: 1350-2020mmHg (stresses are thereby 17 times greater than the physiological ones). Owing to their thermally stabilized macromolecular structures, 18 fabrics made with Diolen and Dacron weft yarns showed relatively stable compliances under super physiological stresses imposed on them throughout the fatigue test, although the second prosthetic structure was twice as compliant as the first. This is due to the use of textured yarns whose corrugation offers great potential for extensibility.…”

“…22,23 To improve both resistance to radial compression and kinking, the prosthetic tubes have been crimped by using the cord-winding technique minutely described in previous works. 18,24 The accordion pleats have been fixed on the prosthetic wall by steaming it at 170˚C for 1hour. After being finished using the same procedure, all samples had the same diameter and crimp geometry (width and depth).…”

“…According to Figure 10, the studied structures showed different levels of compliance during the hydrodynamic test due essentially to the various yarn structures involved as well as their different macromolecular configurations acquired during the thermal treatments of prosthetic crimping. 18,43 As already explained, the fatigue inflicted on the textile prosthetic structures was responsible for the increase of their extensibility and consequently of their compliance. Both starting from similar initial compliances (3.3-3.8 10 -5 mmHg -1 ), the C2 contexture stabilized at the last cycle at compliance close to 4.8 10 -5 mmHg -1 , while that of C3 has risen to 8.8 10 -5 mmHg -1 (+130 %) which could seriously disturb the conditions of blood flow in vivo.…”

“…Nevertheless, when dilation became permanent and caused the textile structure to lose extensibility at the end of fatigue cycles, C2 contexture (Dilat % = 4.55) has been more stable than C3 one (Dilat % = 6.48) because of the greater microstructural stability of Diolen yarns acquired during prosthetic crimping thermal treatments and proved in previous works. 18 However, the best (smallest) overall increase of dilation was recorded for the C1 contexture woven with Dacron yarns which are approved by the FDA for medical applications.…”

Formation Features of Tubular Products on the Basis of Composite Hydrogels

“…It should be noted that nowadays, none of the synthetic prostheses is perfect and has a number of disadvantages. For the purpose of use, a large variety of synthetic textile fibers including Ivalon, Orlon, Nylon and Dacron, as well as non-textile materials (Teflon) have been tested for prosthetic applications [2]. However, studies have shown that vessels based on these materials lead to occur various complications, associated with structural defects such as lack of compliance, dilatation and resistance to the blood and obstruction.…”