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.
Ray Liotta life. Liotta's parents were both Democrats. Liotta recalls attending parades handing out flyers for his father's run for Township Committee. He graduated from Union High School in 1973 in Union, New Jersey where he grew up. Liotta graduated from the University of Miami, where he received a degree in fine arts in 1978 and studied acting with Robert "Buckets" Lowery. He performed in musicals such as "Cabaret", "Dames at Sea", "Oklahoma", and "Sound of Music", during college, especially in his first year of acting studies. After college, Liotta moved to New York City. He got a job as a bartender