Radial force applied with traditional venous stents can cause the diameter of the inflow vein to narrow due to the Poisson effect. This difference in diameter between the inflow vein and the stented vein can lead to low shear rate. Multiple studies have shown that both a narrowed inflow diameter and low shear rate are strong indicators that further intervention will be necessary.
The auxetic stent is a unique, self-expanding stent made of nitinol that actively elongates as it expands. This elongation generates a longitudinal force on the vein, which helps to prevent inflow vein narrowing due to the Poisson effect. The auxetic stent's biomechanical approach helps to preserve the diameter of the inflow vein, maintain a consistent diameter between the inflow vein and the stented vein, and optimize shear rate.
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