Application of radial force with traditional venous stents causes inflow vein diameter narrowing due to the Poisson effect. This diametric mismatch between the inflow vein and stented vein results in low shear rate. Multiple contemporary studies have demonstrated that both reduced inflow diameter and low shear rate are strong predictors of need for reintervention.
The auxetic stent is a self-expanding, nitinol stent that actively elongates during deployment, the first of its kind. This elongation results in application of longitudinal force on the vein, which counteracts the Poisson effect to prevent inflow vein narrowing. The auxetic stent biomechanical approach will result in preservation of inflow vein diameter, maintenance of diametric match between the inflow vein and stented vein, and resultant optimization of shear rate.
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