Abstract: In a blood pump for supporting cardiac performance, including a stent-like housing which has a first axial end and a second axial end, a pump rotor mounted rotatably in the housing, in particular an impellor, and a flexible drive shaft, which can be coupled to a motor in order to drive the pump rotor to rotate, whereby blood is sucked in on an intake side of the pump rotor through an intake tube of the blood pump and is ejected on a discharge side of the pump rotor, the blood pump has a flow directing means arranged downstream of the pump rotor in order to selectively direct the blood conveyed by the pump rotor to the first or to the second axial end of the housing while maintaining the direction of rotation of the pump rotor.

Abstract: The invention relates to a stent pump for intravascular, intraventricular or intraatrial placement inside the human heart comprising: —a preferably tubular housing having an inlet and an outlet, —an impeller, and —a stream former, wherein the impeller and optionally the stream former are arranged within the housing, characterized in that the stream former is arranged downstream of the impeller, and the housing, the stream former and/or the impeller are deployable from a first position, in which the housing, the stream former and/or the impeller are folded for being arranged within a delivery device, into a second, expanded position, in which the housing, the stream former and/or the impeller are deployed.