Key result
Eight femoropopliteal stent systems show substantial differences in flexibility, radial force, and expansion dynamics.
Why the study?
Mechanical parameters of stent systems for femoropopliteal arterial disease require investigation to support interpretation of clinical results and related causalities.
Bench testing of femoropopliteal stent systems reveals large differences in mechanical properties such as flexibility, radial force, and length change during expansion, which may inform device selection.
Mechanical differences among femoropopliteal stents may inform selection; leaves open which properties optimize clinical durability.
Objectives The study investigated mechanical parameters of stent systems indicated for treatment of femoropopliteal (FP) arterial disease to support interpretation of clinical results and the related causalities. Methods Eight stent system types of same dimensions were investigated (n=2). Parameters were the profile of stent delivery system (SDS), radiopacity, trackability and pushability, bending stiffness (flexibility) and axial stiffness of expanded stents, length change during expansion, radial force, crush resistance, strut thickness and general surface condition. Results The trackability ranged from 0.237 to 0.920 N and the pushability was 47.9–67.6 %. The bending stiffness of SDS was between 108.42 and 412.68 N mm2. The length change during stent release to 5 mm was low, with one exception. The bending stiffness of the expanded stents was 2.73–41.67 N mm2. The normalized radial forces at 5 mm diameter ranged from 0.133 N/mm to 0.503 N/mm. During non-radial compression by 50 %, the forces were 3.07–8.42 N, with one exception (58.7 N). The strut thickness was 153–231 µm. Conclusions Large differences occurred for flexibility, radial force and length change during expansion. The data should be used when choosing the proper device for restoring vascular function.
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Schmidt et al. (2023) studied Femoropopliteal (FP) arterial disease (n=16). Mechanical stent systems was evaluated on Mechanical parameters including trackability, pushability, bending stiffness, length change, radial force, crush resistance, and strut thickness. Mechanical evaluation of eight femoropopliteal stent systems revealed large differences in flexibility, radial force, and length change during expansion.
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