Ventricular assist system with secondary impeller

(57) In the centrifugal bloodshed liquid pump which can be used for a summary left ventricle auxiliary use, blood is sent out by the primary impeller (18) from an entrance (16) at an exit (22). Some blood included in a pump passes along a secondary channel (24), and in order that a secondary impeller (70) may carry out lubricous of the bearing between an impeller assembly (14) and the support formed with the component parts of pump housing here, it sends blood. With the peculiar form of a secondary impeller (70), stagnation of blood is prevented and the fluid dynamic bearing flushed enough is offered.