medical apparatus and instruments for organ perfusion and reperfusion; medical devices for preserving human organs awaiting transplantation; portable medical devices for preserving human organs awaiting transplantation; medical devices for assessing viability of human organs awaiting transplantation; portable medical devices for assessing viability of human organs awaiting transplantation; medical devices for resuscitating human organs for organ transplantation; portable medical devices for resuscitating human organs for organ transplantation; medical apparatus and instruments for use in organ transplant; medical apparatus and instruments for resuscitation, preservation, and assessment of explanted organs; medical apparatus and instruments for resuscitation, preservation, and assessment of explanted organs, namely, hearts, lungs, livers and kidneys; heart monitors; medical ventilators; medical respirators; respirators; respirators for artificial respiration; resuscitators; magnetic connectors for medical purposes; pumps for medical purposes; pumps for medical purposes, namely, pumps for controllably circulating fluids and solutions through explanted organs, and pumps for use in perfusion circuits; perfusion pumps; valves for pumps used in the field of organ perfusion, reperfusion, preservation and transplantation; surgical and medical apparatus and instruments for assessment and transplant of organs; surgical and medical apparatus and instruments for perfusion and reperfusion of organs with fluid for the purpose of preservation, maintenance, assessment and resuscitation; portable organ preservation and transportation systems comprising an organ chamber, perfusion circuit, temperature control means, oxygenation means, and flow control means; organ chambers and perfusion circuits for use in portable organ preservation systems