When Matthew Green leaves hospital, the one thing he really mustn't forget is his rucksack.
The father of one will be carrying part of his new heart in it.
Mr Green, 40, will be the first Briton to be discharged from hospital with a completely artificial heart.
The device in his chest is slightly larger than the organ it replaces and weighs less than six ounces. It delivers blood to the body with the help of a pump that is carried in the rucksack, along with a battery.
HEART OF THE MATTER
A total artificial replacement for the human heart has been one of the holy grails of modern medicine.
Dr Denton Cooley implanted the first experimental device in Haskell Carp at St Luke's Hospital in Houston in 1969. The patient died three days later.
Following animal testing in the 1970s, the next operation took place in 1982 when the Jarvik 7artificial heart was transplanted into a dentist called Barney Clark. 198 operations followed.
By 2001 the first completely self-contained total artificial heart was implanted in Robert Tools at the Jewish Hospital in Louisville.
And in 2008, Charles Okeke was implanted with the SynCardia Total Artificial Heart, becoming the the first patient to leave hospital with an artificial heart in May 2010.
Since then the SynCardia Total Artificial Heart has been used in more than 900 implants in 65 hospitals.
Papworth is the 66th hospital in the world and the first in the UK to be allowed to use the SynCardia artificial heart.
