Artificial hearts have entered the clinical testing phase before, only to prove disappointing later. The big stumbling block has been the tendency of all previous artificial hearts to cause blood to clot. Achieving a high long-term success rate in human patients has proven frustratingly elusive. Current artificial hearts are generally used only to keep the patient alive until a proper human donor heart is available.
It’ll be years before we know whether the Carmat heart will be the first implantable artificial heart that can be used successfully for the long term. We’ll be watching this one closely.