I thought mechanical are a thing But apparently they are not durable and the valves make noises therefore current mechanical hears are very noisy By durable that means the patient can leave the hospital and can take the place of or improve upon a normal heart permanently a guy here had it fitted and after ore that 100 days living at home The trials have started a while ago. And it is due for being on the market in 2 to three years
Australian man successfully receives titanium heart after 6-hour operation
A New South Wales man with heart failure lived with the artificial heart for over 100 days while waiting to be matched with a heart donor.

(www.abc.net.au)