ValveXchange, Inc., a medical device company, develops and markets a two-piece bioprosthetic tissue valve system that resolves compromises between conventional mechanical and tissue-based prosthetic valves. It offers VXi Vitality, a surgically implantable heart valve system that consists of a two-piece exchangeable tissue valve, valve delivery and exchange tool set, and an apical introducer for replacing the exchangeable tissue leaflets when they wear out. The company is also developing VXi Vanguard, a transapically implantable valve and exchange system.