Abstract
Factors affecting antithrombogenecity of a commercial available heart valve. XPS analysis disclosed oxidised layer of more than 100 Å on a Ti valve ring. Oxidised layer consisted of O2- and OH- or H2O combined to Ti. In vitro “kinetic test” disclosed that an the Ti valve ring blood clotted in a shorter time than on sputtered Ti. Worse blood compatibility of Ti valve ring is due to oxidised layer, which was produced during maching process.
