High-performance Stent Technology

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This study aimed at developing high biocompatible stent technology based on ex vivo cell seeding by combination of cell engineering, matrix engineering and scaffold engineering, by which rapid complete endothelialization on an implanted stent as to fully prevent thrombus formation, thus avoiding stenosis and occlusion, will be achieved. To this end, the authors developed endothelial cell and endothelial progenitor cell, both of which are harvested from autologous tissue or blood, are seeded and cultured to form monolayered tissue on the whole body of stent. As for matrix engineering, vinylated biomolecules include albumin, gelatin and heparin were photopolymerized under visible light-irradiation to form completely cover the stent surface prior to cell seeding. As for scaffold engineering, the authors devised electrospinning method using synthetic biodegradable elastomer (copolymer of lactide and caprolactone) to form a mesh-type cover stent. Bioactive substances such as collagen, heparin and growth factor were also co-electronspun. It is envisaged that the combination of these technologies expectantly enhances the thrombus-free condition which starts immediately after implantation.