are these things possible?
im sure they are but theres a rage for "iron hearts" and artifical hearts but surely you can just give a new heart to a pateint from someone who died with a healthy heart.
its a muscle pump basically, so all you gotta do is cut out the patients heart with their main veins n arteys connected too some sort of blood supply, then connect each of the veins/arterys of the new heart and patient together and it more or less should be done
although id think you would need to jump start the heart like a car so I dunno if thats why they use those electrical things because muscles respond too electric impulses so you would shock it a few times too start it up.
this is obviously over simplified but I just dont see where you could go wrong.