Blood pump system for circulating the blood of a patient in an extracorporeal blood circuit, the blood pump system being characterized by: a disposable head (11) of the pump, which has an inlet (13) and an outlet (14) formed inside the enclosure body (30, 31) of the impeller tightly sealed, the pump head further comprising an impeller (15) contained inside the enclosure body (30, 31) of the impeller tightly closed, having an upper disk (33) and a lower disk (32) with drive blades (34) mounted therebetween, the upper and lower discs (33, 32) having the respective magnetic structures (36, 37), in which the inlet (13) and outlet (14) are adapted to receive pipes from an extracorporeal blood circuit； and a reusable levitation / drive unit (12) having a wrapping body with upper and lower sections (17, 20, 21) of the wrapping body with relative movement capacity, the 15 sections of the wrapping body being movable to a position of opening to allow the introduction of the disposable head (11) of the pump, and a closed position to keep the disposable head (11) of the pump in a predetermined position, in which the reusable levitation / drive unit (12) includes a levitation magnet (22) in one of the sections of the shell, and a drive magnet (18) in the other of the sections of the shell； characterized in that: the upper section of the enveloping body comprises first and second jaw elements (20, 21) each of which can be moved relatively with respect to the lower section (17) of the enveloping body； in which the first and second jaws (20, 21) are mounted to move on a support rod (16) and, at least, one of the first and second jaws (20, 21) is articulated in the support rod (16) for lateral displacement.Sistema de bomba para sangre para hacer circular la sangre de un paciente en un circuito sanguíneo extracorpóreo, estando caracterizado el sistema de la bomba para sangre por: un cabezal desechable (11) de la bomba, que tiene una entrada (13) y una salida (14) formadas en el inter
