Ventricular assist devices are intended to treat terminal heart failure that can no longer respond to medications or to the use of conventional pacemakers. Its function is to emulate the heart, helping the proper circulation of blood from the left ventricle to the heart and to the whole body. Usually, the ideal candidates for this type of device are patients who are on a waiting list for a heart transplant, whose only hope of survival is the fitting of this assistance system, although it is also a good solution for those patients who are not candidates for a heart transplant, since these devices allow them to extend their lives. Surgical intervention with general anaesthesia is required in order to fit the device. The system has three parts: a pump, which can be of continuous or pulsating flow (located inside the abdomen), an electronic controller and a battery.