Abstract
Background:
Biodegradable poly (l-lactic acid) (PLLA), a bio safe polymer with a large elastic modulus, is widely used in biodegradable medical devices. However, because of its poor mechanical properties, a PLLA strut must be made twice as thick as a metal strut for adequate blood vessel support. Therefore, the mechanical properties of a drug-eluting metal-based stents (MBS) and a bioresorbable vascular scaffolds (BVS) were evaluated and their safety and efficacy were examined via a long-term rabbit iliac artery model.
Methods:
The surface morphologies of the MBSs and BVSs were investigated via optical and scanning electron microscopy. An everolimus-eluting (EE) BVS or an EE-MBS was implanted into rabbit iliac arteries at a 1.1:1 stent-to-artery ratio. Twelve months afterward, stented iliac arteries from each group were analyzed via X-ray angiography, optical coherence tomography (OCT), and histopathologic evaluation.
Results:
Surface morphology analysis of the EE coating on the MBS confirmed that it was uniform and very thin (4.7 μm). Comparison of the mechanical properties of the EE-MBS and EE-BVS showed that the latter outperformed the former in all aspects (radial force (2.75 vs. 0.162 N/mm), foreshortening (0.24% vs. 1.9%), flexibility (0.52 vs. 0.19 N), and recoil (3.2% vs. 6.3%). At all time points, the percent area restenosis was increased in the EE-BVS group compared to the EE-MBS group. The OCT and histopathological analyses indicate no significant changes in strut thickness.
Conclusion:
BVSs with thinner struts and shorter resorption times should be developed. A comparable long-term safety/efficacy evaluation after complete absorption of BVSs should be conducted.
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Acknowledgements
This work was supported by a Korean Medical Device Development Fund Grant funded by the Korean government (the Ministries of Science and ICT; Trade, Industry, and Energy; Health and Welfare; and Food and Drug Safety) (1711138916, KMDF_PR_20200901_0280 and 1711137864,KMDF_PR_20200901_0005). This research was also supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Korean Ministry of Education (NRF-2020R1I1A3A04036675).
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The animal studies were performed after receiving approval from the Institutional Animal Care and Use Committee (IACUC) in Chonnam National University Hospital (IACUC approval No. CNUHIACUC-21004).
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Park, D.S., Jeong, M.H., Jin, Y.J. et al. Preclinical Evaluation of an Everolimus-Eluting Bioresorbable Vascular Scaffold Via a Long-Term Rabbit Iliac Artery Model. Tissue Eng Regen Med 20, 239–249 (2023). https://doi.org/10.1007/s13770-023-00518-z
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DOI: https://doi.org/10.1007/s13770-023-00518-z