The patented invention by Georgetown University Medical School–educated heart surgeon Waleed Hassanein is a new system to keep donor organs alive and functioning outside the human body before they reach transplant recipients (heart is beating, lungs are breathing, liver producing bile, and kidneys are making urine). In clinical practice, the Organ Care System (OCS) has been used successfully to preserve and transport a human heart for up to 11 hours, nearly triple the time possible with cold storage.