Mechanical characteristics of novel polyester/NiTi wires braided composite stent for the medical application

In this paper investigation results of behavior of promising superelastic alloys of Ti-Nb-Zr system in blood-vessel are presented. The possibility of their use in manufacturing of medical stents is examined. Based on analytical review of present scientific papers, four different alloys of Ti-Nb-Zr system are taken in consideration. A finite element modelling of stent behavior during delivery and opening stages is considered. These processes are done for two typical stent geometries and four alloys possessing different mechanical properties. Finite modelling results are analyzed to show the distribution of internal stresses, mechanical aspects of stent installation and effectiveness of various configurations to widen the narrowed vessel. Modeling has allowed to formulate recommendations for optimal mechanical characteristics of the superelastic alloy used for the manufacture of medical stents.

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Comparison for Physical and mechanical Characteristics of Esthetic NiTi Wires

Korean Journal of Dental Materials ◽

10.14815/kjdm.2011.06.38.2.117 ◽

2011 ◽

Keyword(s):

Mechanical Characteristics ◽

Niti Wires ◽

Physical And Mechanical Characteristics

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Mechanical characterizations of braided composite stents made of helical polyethylene terephthalate strips and NiTi wires

Nanotechnology Reviews ◽

10.1515/ntrev-2019-0016 ◽

2019 ◽

Vol 8 (1) ◽

pp. 168-174 ◽

Cited By ~ 3

Author(s):

Qingli Zheng ◽

Pengfei Dong ◽

Zhiqiang Li ◽

Xinwei Han ◽

Changchun Zhou ◽

...

Keyword(s):

Polyethylene Terephthalate ◽

Mechanical Performance ◽

Covered Stent ◽

The Novel ◽

Braided Composite ◽

Compression Load ◽

Radial Strength ◽

Weaving Pattern ◽

Longitudinal Flexibility ◽

Niti Wires

Abstract The novel braided composite stent (BCS), woven with both nitinol wires and polyethylene terephthalate (PET) strips, were characterized and compared with the braided nitinol stent in the same weaving pattern. Finite element models simulating the stent compression and bending were developed to quantify its radial strength and longitudinal flexibility. The interaction between the nitinol wires and the PET strips were also delineated. Results showed that the PET strips enforced more constrains on the BCS and thus enhance its radial strength especially at a larger compression load. The longitudinal flexibility of the BCS was less sensitive to the presence of the PET strips. This work suggested that the novel design of the BCS could acquire the advantage of a covered stent without compromising its mechanical performance. The fundamental understanding of the braided composite stent will facilitate a better device design.

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