Abstract: The invention relates to a centrifugal pump, especially for blood, comprising a pump rotor which is arranged in a rotational manner and without a bearing in a liquid-tight and gas-tight closed housing, except for at least one inlet opening and at least one outlet opening. The rotor is also the rotor of a drive motor. The rotor is symmetrical with respect to the centre plane thereof and comprises an upper and a lower covering. The rotor and/or the pump housing are formed in such a way that the axial distances between the upper and the lower coverings and the upper and lower housing walls are smaller in the radially inner region of the rotor than in the radially outer region.

Abstract: The invention relates to a centrifugal pump, especially for blood, comprising a pump rotor (14) which is arranged in a rotational manner and without a bearing in a liquid-tight and gas-tight closed housing (11), except for at least one inlet opening and at least one outlet opening (12, 13). Said rotor is also the rotor of a drive motor. Said rotor (14) is symmetrical with respect to the centre plane thereof and comprises an upper and a lower covering (16, 17). The rotor (14) and/or the pump housing (11) are formed in such a way that the axial distances between the upper and the lower coverings (16, 17) and the upper and lower housing walls are smaller in the radially inner region of the rotor (14) than in the radially outer region.

Abstract: The centrifugal blood pump has a pump rotor (15) arranged inside a housing (13) which is closed with the exception of a blood outlet (15') and a blood inlet (14). The rotatable pump rotor (15) inside the housing (13) is driven by an external drive motor (10) via a magnetic coupling. The magnetic coupling is provided by thin exterior permanent magnets (21) circumferentially distributed around the rotor (15) on a coupling part (12,20) connected to the external drive motor (10) and correspondingly thin circumferentially distributed permanently magnetized ferromagnetic regions (17,18) of the pump rotor which are coupled with the permanent magnets (21) to form a magnetic field bridge (22) and thus to avoid axially directed tilting or tipping moments. The pump rotor (15) can be additionally stabilized against translational motion in the radial direction by a mechanical bearing device (24) for the rotor which is provided inside an interior space through which blood flows in the pump housing.