A medical device comprises a pump adapted to fit within an atrium of a heart, said pump comprising an inlet and an outlet. The device further comprises a flexible outflow conduit coupled to said outlet. A method of assisting ventricular function of a heart of a patient comprises: a) inserting a continuous flow pump having an inlet and an outlet into the heart via a subclavian or jugular vein； b) attaching the outlet of the continuous flow pump to an atrial septum, wherein the inlet of the continuous flow pump is directed into a heart atrium； c) attaching the distal end of the outflow conduit to an artery； and d) operating the pump at a volumetric rate ranging from about 2 L/min to about 3 L/min.
