Evidence from randomised human and experimental trials indicate that the results of heart transplantation improve with the use of perfusion of donor hearts. In these reanimation studies, we evaluated the efficacy of a novel mechanical perfusion device (Organ Angel) in preserving porcine hearts for six hours ex vivo. The device utilises hypothermic perfusion with celsior solution at a low flow rate of 40ml/min. 12 Porcine hearts were explanted using standard techniques and randomised to either be preserved via cold storage (n=6) or mechanical perfusion (n=6). Following preservation, the hearts were reanimated on a bench bypass circuit and assessed for two hours. Cardiac performance was assessed every 30 minutes in the working model after a stabilization period in non-working status (langendorff model). The mechanical perfusion device demonstrated superior preservation compared to cold storage in terms of cardiac performance (Cardiac output) p=0.01 on the bench bypass circuit, electron microscopy, and biochemical normality. These findings suggest that the mechanical perfusion device provides an alternative to cold storage preservations and has the potential to improve the preservation of hearts for transplantation.