An incredible new transplant method has been captured on camera, keeping a human heart beating in a machine.
The device, expected to save millions of lives, keeps donor organs alive after being taken from a body.
This means that they can remain usable for much longer before being placed in a recipient's body.
One patient who benefited from the device was Lee Hall, who underwent a high-tech transplant at Harefield Hospital.
During an interview he said: “It was touch and go for me, they said they had a heart for me but it was coming from a different to normal source – and that it would be revived in a ‘special box’.
"I said I didn’t care as long as it allowed me to see my son again.”
The box used to save Hall is named the Organ Care System and can also keep lungs breathing and kidneys producing urine.
TransMedics developed the product, which they claim is the world’s only portable medical device capable of overcoming the limitations of cold storage for multiple organ transplantation.