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A pump for transferring fragile and aggressive fluids such as human blood and comprising a pumping chamber along with a pair of fluid inlet ports arranged in oppositely disposed relationship on the chamber, and one or more outlet ports arranged transversely and medially of the inlet ports. A rotor i

A pump for transferring fragile and aggressive fluids such as human blood and comprising a pumping chamber along with a pair of fluid inlet ports arranged in oppositely disposed relationship on the chamber, and one or more outlet ports arranged transversely and medially of the inlet ports. A rotor is positioned within the pumping chamber having a dual-conical configuration converging toward opposed polar end regions and with an axis of rotation extending between the polar regions. The rotor includes a plurality of radial vanes mounted on the outer surface of the dual cones forming the dual-conical configuration, and with the radially outward tips of the vanes encapsulating permanent magnets, with the vanes and permanent magnets being arranged at equally radially spaced locations. A magnetic drive is positioned to deliver rotational driving energy to the magnets in the rotor. The sole support for the rotor are the hydrodynamic forces acting upon the rotor during its operation, with the rotor body having a relative density of between 10% and 90% of the relative density of the fluid being pumped.

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[ What is claimed is:] [1.] A pump for transferring fluids and comprising a pumping chamber with an inner periphery, an outer periphery and a central axis, a pair of fluid inlet ports arranged in oppositely disposed relationship on said chamber and coaxially with said pumping chamber, an outlet port

[ What is claimed is:] [1.] A pump for transferring fluids and comprising a pumping chamber with an inner periphery, an outer periphery and a central axis, a pair of fluid inlet ports arranged in oppositely disposed relationship on said chamber and coaxially with said pumping chamber, an outlet port means arranged transversely and generally medially of said pair of inlet ports, a rotor disposed within said pumping chamber and having a dual conical configuration converging toward opposed polar regions and having an axis of rotation extending between said polar regions and arranged coaxially with the axis of said pumping chamber during operational rotation of said rotor, magnetic driven means arranged on said rotor at radially spaced locations generally symmetrically along said axis of rotation, electromagnetic drive means coupled to a source of energy and arranged to deliver rotational driving energy to said rotor through said magnetic driven means; said rotor comprising:(a) a body having a density relative to the fluid being pumped substantially less than that of the fluid being pumped and within a range of between about 0.1 and 0.9;(b) said body having an axial length and with the axial length along said axis of rotation defining the axial length of said pumping chamber disposed between said inlet ports; and with the diameter of said rotor body transverse to said axis of rotation defining a medial plane and the axial length and the diameter being selected to provide a clearance between the outer surface of said rotor and the inner surface of said pumping chamber;(c) a plurality of radial vanes mounted on the outer peripheral surfaces of said rotor and extending in an axial direction from a plane through the center of said rotor transverse to the axis of rotation thereof, and with the outer peripheral edges of said vanes being spaced from the inner peripheral surface of said housing along an approximately constant dimension and with the cross-sectional area of the inlet ports being substantially equal to that of the outlet ports, thereby providing for hydrodynamic balance of said rotor.