Which is the bacterium that could contribute in realizing artificial blood vessels?

Bypass Operations are the classical interventions when occurs a blockage into the coronary vessels surrounding the heart. The first source of replacing the damaged vessels is a vain from the patient's leg, but if it's not fitting, the alternative consists in synthetic vessel. The problem with this kind of vessels is that, unlike the real ones, which possess a layer of cells that prevent clotting, the artifficial ones presesent an increased risk of blood clots.

It is known that  around 6,000 of bypass operations are made in Sweden in every year, so that, facing with the problem of clotting from artificial vessels, specialists from Sahlgrenska Academy at the University of Gothenburg, Sweden, have developped a thesis, where they have revealed the properties of the cellulose, produced by the bacterium Acetobacter xylinum. Compared with artificial vessel materials, cellulose produced by bacteria and used to build vessels, in contact with human blood, it is more resistant to pressure exercised to them and is better tolerated by human tissue.