Preliminary results of small arterial substitute performed with a new cylindrical biomaterial composed of bacterial cellulose.

Abstract

Tissue-engineered blood vessels (TEBVs) represent an innovative approach for overcoming reconstructive problems associated with extended vascular diseases by providing small-calibre vascular grafts. This study aimed to evaluate a novel biomaterial of bacterially synthesised cellulose (BC) as a potential scaffold for TEBV. Highly crystalline cellulose was produced by a bacterium (Acetobacter xylinum) using glucose as a source of carbon. Using a patented process, hollow-shaped segments of BC were created with a length of 10mm, an inner diameter of 3.0-3.7mm and a wall thickness of 0.6-1.0mm. These grafts were used to replace the carotid arteries of eight pigs, and after a follow-up period of 3 months, the grafts were removed and analysed, both macro- and microscopically. Seven grafts (87.5%) remained patent, whereas one graft was found to be occluded. Scanning electron microscopic examination revealed rapid re-cellularisation by recipient endothelial cells. Light microscopic examination showed a three-layered wall structure of the BC segments, with cellulose still being present in the media. These data indicate that the innovative BC-engineering technique results in the production of stable vascular conduits, which exhibit attractive properties for their use in future TEBV programmes for vascular surgery.