Founded in 1991, ATS Medical manufacturers and markets products and services that are used by cardiovascular surgeons. ATS Medical focuses on serving the cardiac surgery community through its various products and services, including ATS Simulus annuloplasty products, Surgi-Frost and Frost-Byte for surgical cryoablation of cardiac arrhythmias, and RTI-Cardiovascular for allograft tissue services. It also offers QAS home monitoring services for anticoagulation therapy and the development of PARSUS blood filtration technology. Its ATS Open Pivot heart valve helps in the treatment of heart valve diseases caused by natural aging, rheumatic heart disease, prosthetic valve failure and congenital defects. The company is headquartered in Minneapolis, and markets its products throughout the United States, Europe, China, Japan and Canada.