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首页> 外文期刊>Journal of Biomechanics >A computational study of knitted Nitinol meshes for their prospective use as external vein reinforcement.
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A computational study of knitted Nitinol meshes for their prospective use as external vein reinforcement.

机译：编织镍钛诺网的预期应用作为外部静脉加固的计算研究。

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External reinforcement has been suggested for autologous vein grafts to address the mismatch of mechanical properties and fluid dynamics of graft and host vessel, a main factor for graft failure. A finite-element tool was developed to investigate the mechanical behaviour, in particular radial compliance, of knitted Nitinol meshes (internal diameter: 3.34 mm) with two different knit designs (even versus uneven circumferential loops) and three different wire thicknesses (0.05, 0.0635 and 0.075 mm) under physiological conditions. The Nitinol material parameters were obtained from experimental testing. The compliance predicted for the 80-120 mmHg physiological blood pressure range was 2.5, 0.9 and 0.6%/100 mmHg for the even loop design and 1.2, 0.5 and 0.5%/100 mmHg for the uneven loop design, for wire thicknesses of 0.05, 0.0635 and 0.075 mm. The highest stress, at 120 mmHg, was found in the even loop mesh with the thinnest wire to be 268 MPa, remaining 44.5% below the stress initiating stress-induced phase transformation. The maximum stress decreased to 132 and 91 MPa with increasing wire thickness of the same loop design. The uneven loop design exhibited maximum stress levels of 65.3%, 63.6% and 87.9% of the even loop values at 0.05, 0.0635 and 0.075 mm wire thickness. The maximum strain of 0.7%, at 120 mmHg, remained un-critical considering a typical high-cycle recoverable strain of 2%. It was demonstrated that the numerical approach developed was feasible of effectively evaluating design variations of knitted Nitinol meshes towards vein graft behaviour equivalent to arterial mechanics.
机译：已经提出对于自体静脉移植物进行外部加固，以解决移植物和宿主血管的机械性能和流体动力学的不匹配问题，这是移植物衰竭的主要因素。开发了一种有限元工具来研究具有两种不同编织设计（甚至与不均匀的圆周环）和三种不同线径（0.05、0.0635）的编织镍钛诺网眼（内径：3.34毫米）的机械性能，尤其是径向柔度。和0.075毫米）。镍钛诺材料参数是从实验测试中获得的。对于线宽为0.05， 0.0635和0.075毫米。在具有最细金属丝的均匀环网中发现最高应力为120 mmHg，为268 MPa，比应力引发应力引起的相变低44.5％。随着相同回路设计的线材厚度的增加，最大应力降至132和91 MPa。不均匀的环设计在0.05、0.0635和0.075 mm的线径下表现出最大应力水平，分别为均匀环值的65.3％，63.6％和87.9％。考虑到2％的典型高循环可回收应变，在120 mmHg时最大应变为0.7％仍然不重要。结果表明，开发的数值方法是可行的，可以有效地评估编织的镍钛诺网的设计变异对等效于动脉力学的静脉移植行为。

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