A new medical device being tested in Pittsburgh is allowing a human heart to beat on its own outside a body. Doctors at the University of Pittsburgh Medical center are testing what is called the Portable Organ Preservation System. The heart was connected to the device . It came from an 80 year old man and is said to be unsuitable for transplant. The machine pushes warm blood into organs to keep them functioning. The first human organ to be connected to the machine was a kidney, which was kept functioning for 24 hours. Doctors say the technology could give surgeons more time to get potential recipients to a hospital where an organ can be transplanted.