Artificial heart valve was later changed to use silicone-coated material. The first implantation of mechanical heart valve to human was performed by Dr. Hufnagel on 11 September 1952, using the valve that he developed. This event accelerated the development of other artificial heart valves. Artificial heart valve An artificial heart valve is a device implanted in the heart of a patient with valvular heart disease. When one of the four heart valves malfunctions, the medical choice may be to replace the natural valve with an artificial valve. This requires open-heart surgery. Valves are integral to the normal physiological functioning of the human heart.
Nick Liotta Nick Liotta Domenic A. "Nick" Liotta (January 28, 1928 – November 28, 1951) was an American football player. A native of Everett, Massachusetts, he attended Villanova University where he played college football as a guard and linebacker. He developed a reputation as a 60-minute player and served as co-captain of Villanova's 1951 football team. He was selected by the Football Writers Association of America as a first-team guard and by the "Chicago Tribune" (based on votes of fellow players) as a first-team linebacker on their respective 1951 College Football All-America Teams. Prior to the end of the 1951 season, and