EVALUATION OF EXPANSION POWER OF ARTERIAL STENT PROTOTYPES
DOI:
https://doi.org/10.22491/2357-9730.126166Keywords:
Endoprosthesis, stents, prototypes, Force x Strain testsAbstract
Objective: Several metal stents have been developed in the last years. There are great differences concerning their mechanical properties. Aiming at evaluating the performance of the prototype stents, a device and a procedure to obtain curves of Expansion Power (F) X Relative Strain (ε) of these stents were developed.
Materials and Methods: Three different stents were chosen to undergo compression analysis: the Talent stent, the X stent prototype, and the Z stent prototype. To determine the F X ε curves of the stents, the Force X Displacement curves of each stent were obtained with the compression device and, based on these figures, the resulting deformation was calculated.
Results: The force level presented by the Talent stent was the highest (4.35 N for ε = 0.30) and the X stent prototype presented the lowest force level (0.19 N for ε = 0.30).
Conclusions: The results presented show that a reformulation of mechanical characteristics of the X stent prototype is necessary for a more satisfactory performance. The main factors which make the force level presented by this prototype to be so low are its geometric configuration and the diameter of the thread used in its construction.
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