AIM: The aim of this study was to evaluate short-term patency of the new prosthetic graft and its structural changes after explantation. METHODS: The study team developed a three-layer conduit composed of a scaffold made from polyester coated with collagen from the inner and outer side with an internal diameter of 6 mm. The conduit was implanted as a bilateral bypass to the carotid artery in 7 sheep and stenosis was created in selected animals. After a period of 161 days, the explants were evaluated as gross and microscopic specimens. RESULTS: The initial flow rate (median ± IQR) in grafts with and without artificial stenosis was 120 ± 79 ml/min and 255 ± 255 ml/min, respectively. Graft occlusion occurred after 99 days in one of 13 conduits (patency rate: 92%). Wall-adherent thrombi occurred only in sharp curvatures in two grafts. Microscopic evaluation showed good engraftment and preserved structure in seven conduits; inflammatory changes with foci of bleeding, necrosis, and disintegration in four conduits; and narrowing of the graft due to thickening of the wall with multifocal separation of the outer layer in two conduits. CONCLUSIONS: This study demonstrates good short-term patency rates of a newly designed three-layer vascular graft even in low-flow conditions in a sheep model.

Department of Cardiovascular Surgery 1st Faculty of Medicine Charles University and General University Hospital Prague U Nemocnice 2 128 08 Prague 2 Czech Republic

Department of Mechanics Biomechanics and Mechatronics Faculty of Mechanical Engineering Czech Technical University Prague Technicka 4 166 07 Prague 6 Czech Republic

Department of Radiology 1st Faculty of Medicine Charles University and General University Hospital Prague U Nemocnice 2 128 08 Prague 2 Czech Republic

Department Pathology Institute for Clinical and Experimental Medicine Vídeňská 9 140 21 Prague 4 Czech Republic

Institute of Physiology 1st Faculty of Medicine Charles University Prague Albertov 5 128 00 Prague 2 Czech Republic

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