TY - JOUR
T1 - Mechanical characterization of braided self-expanding stents
T2 - Impact of design parameters
AU - Zheng, Qingli
AU - Mozafari, Hozhabr
AU - Li, Zhiqiang
AU - Gu, Linxia
AU - An, Meiwen
AU - Han, Xinwei
AU - You, Zhong
N1 - Publisher Copyright:
© 2019 World Scientific Publishing Company.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - In this paper, the mechanical performance of braided nitinol stents was systematically studied to provide guidelines for optimum stent designs. The influences of braiding patterns, braiding angles, wire diameters, and strand numbers on the mechanical behavior of the stent in terms of crimping strain, radial strength, longitudinal flexibility, and stability were characterized utilizing finite element method. Our results have shown that the two key design factors of braided stents are the braiding angle and wire diameter. A smaller braiding angle can increase radial stiffness and have better longitudinal flexibility and can maintain the stent stability. The wire diameter has less influence on the radial stiffness than the braiding angle, but the longitudinal flexibility is most sensitive to the wire diameter. The strand number is directly proportional to the radial stiffness and inversely proportional to the longitudinal flexibility. Compared to the classical crossing pattern, we have also proposed two patterns. These patterns have a minimal impact on the crimping and radial stiffness of stents, but the stent made from them are more flexible. Among three crossing patterns, it is interesting to see that the classical pattern is the most stable crossing pattern for stand numbers larger than 36, but it became the most unstable pattern at the strand number of 24. This work has shed light on the optimum design of braided stents.
AB - In this paper, the mechanical performance of braided nitinol stents was systematically studied to provide guidelines for optimum stent designs. The influences of braiding patterns, braiding angles, wire diameters, and strand numbers on the mechanical behavior of the stent in terms of crimping strain, radial strength, longitudinal flexibility, and stability were characterized utilizing finite element method. Our results have shown that the two key design factors of braided stents are the braiding angle and wire diameter. A smaller braiding angle can increase radial stiffness and have better longitudinal flexibility and can maintain the stent stability. The wire diameter has less influence on the radial stiffness than the braiding angle, but the longitudinal flexibility is most sensitive to the wire diameter. The strand number is directly proportional to the radial stiffness and inversely proportional to the longitudinal flexibility. Compared to the classical crossing pattern, we have also proposed two patterns. These patterns have a minimal impact on the crimping and radial stiffness of stents, but the stent made from them are more flexible. Among three crossing patterns, it is interesting to see that the classical pattern is the most stable crossing pattern for stand numbers larger than 36, but it became the most unstable pattern at the strand number of 24. This work has shed light on the optimum design of braided stents.
KW - Nitinol braided stents
KW - crimping
KW - design parameters
KW - finite element analysis
KW - flexibility
KW - radial strength
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U2 - 10.1142/S0219519419500386
DO - 10.1142/S0219519419500386
M3 - Article
AN - SCOPUS:85072126093
SN - 0219-5194
VL - 19
JO - Journal of Mechanics in Medicine and Biology
JF - Journal of Mechanics in Medicine and Biology
IS - 6
M1 - 1950038
ER -