A novel double arrowhead auxetic coronary stent

Area of Science:

• Biomedical Engineering
• Materials Science
• Cardiovascular Research

Background:

• Traditional coronary stents face limitations like restenosis, foreshortening, and recoil.
• Auxetic stents, with a negative Poisson's ratio, exhibit unique deformation for improved mechanical performance.

Purpose of the Study:

• To analyze a novel double arrowhead (DA) auxetic stent design.
• To overcome limitations of traditional stents, focusing on radial strength, foreshortening, and radial recoil.

Main Methods:

• Parametric analysis of the DA unit ring structure using finite element analysis.
• Evaluation of design parameters (angle, amplitude, width) on mechanical characteristics.
• Comparison of the DA auxetic stent with a commercial Cypher™ stent.

Main Results:

• Strut width was the primary determinant of stent properties; angle and width had minimal impact.
• The DA auxetic stent demonstrated over double the radial strength (7.26 N/mm) of the Cypher™ stent.
• The proposed stent showed reduced radial recoil and eliminated foreshortening.

Conclusions:

• The DA auxetic stent exhibits superior mechanical properties compared to commercial stents.
• This auxetic stent design shows significant potential for future cardiovascular applications.