CryoLife preserves lives by conserving the tissues that sustain them. The company takes human heart valves and blood vessels from deceased volunteer donors, processes them, and stores them in liquid nitrogen freezers (a process called cryopreservation). It then ships them to US surgeons, who implant them during surgical procedures. For some preserved tissue, the company uses its proprietary SynerGraft technology, which reduces the presence of donor cells and makes the tissue more compatible with the recipient. CryoLife also develops implantable biomaterials, including BioGlue, an adhesive used to seal internal surgical wounds.