A 40-year-old father who was dying from heart failure is set to leave hospital after receiving an artificial heart.
Matthew Green is ready to go home and await a transplant after surgeons at Papworth Hospital in Cambridgeshire replaced his heart with an implant.
It is thought to be the first time a UK patient has been able to go home with an entirely artificial heart.
Around 900 similar operations have been carried out around the world.
Mr Green said: "It's going to revolutionise my life. Before I couldn't walk anywhere. I could hardly climb a flight of stairs and now I've been up and I've been walking out and getting back to a normal life.
"I went out for a pub lunch over the weekend and that just felt fantastic, to be with normal people again."
Consultant cardiothoracic surgeon Mr Steven Tsui said without the device Mr Green, from London, might not have survived the wait for a heart transplant operation.
"At any point in time there may be as many as 30 people waiting for a heart transplant on our waiting list at Papworth, with one third waiting over a year," he said.
"Matthew's condition was deteriorating rapidly and we discussed with him the possibility of receiving this device, because without it, he may not have survived the wait until a suitable donor heart could be found for him."
He said for the first time a patient was walking the streets of Britain without a human heart.