'I felt so ill before, so now to be feeling so well and full of life is great. I feel very lucky,' he said. 'I'm still recovering from my operation so not all of the bones in my chest have healed yet. I struggle to carry it (the rucksack containing the pump and batteries) but I can walk around fine. I needed a trolley to start with.'
He added: 'It feels very different - before the operation my heart beat was very weak and I could hardly feel my pulse. Now it's a very strong heart beat.
'Two years ago I was cycling nine miles to work and nine miles back every day but by the time I was admitted to hospital I was struggling to walk even a few yards. I am really excited about going home and just being able to do the everyday things that I haven't been able to do for such a long time - such as playing in the garden with my son and cooking a meal for my family.'
Mr Green, a pharmaceutical consultant who lives with wife Gill and their five-year-old son Dylan in London, was diagnosed with Arrhythmogenic Right Ventricular Cardiomyopathy, a disease of the heart muscle that can cause arrhythmia, heart failure, and sudden death.
The exact cause of the condition - the second most common reason for sudden death in the young - is unknown, although it appears to be passed on genetically.
With time running out as both chambers of his heart failed, a transplant team led by cardiothoracic surgeon Steven Tsui went to Paris for training.
They were assisted during the six-hour operation on June 9 by Dr Latif Arusoglu, an expert Total Artificial Heart surgeon from Germany, and seven weeks on Mr Green is ready to return home.
Another patient received a totally artificial heart at the same hospital back in 1986 but the Jarvik-7 device was removed after two days when a donor was found. It is unlikely the patient could have been discharged anyway because of the bulkiness of the equipment needed at the time.
Mr Tsui said: 'The beauty of this device is the simplicity of the components which make it so durable.