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A rotary pump for pumping fluids through a patient having a housing with an internal region, a stator member and an impeller positioned within the housing and having impeller blades, wherein the impeller is magnetically suspended and rotated, and wherein the geometric configuration of the rotary pum

A rotary pump for pumping fluids through a patient having a housing with an internal region, a stator member and an impeller positioned within the housing and having impeller blades, wherein the impeller is magnetically suspended and rotated, and wherein the geometric configuration of the rotary pump is sized and proportioned to minimize stagnant and traumatic fluid flow within the rotary pump. The plurality of magnetic impeller blades are preferably rare earth, high-energy-density magnets selected from the group consisting of samarium cobalt and neodymium-iron-boron alloy.

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[ We claim:] [1.] A rotary pump for pumping fluid through a patient comprising:(a) a housing that has an inlet, an outlet and an inner surface, at least a region of which is curved;(b) a stator member attached to said housing comprising:(b.sub.1) a substantially conically shaped nose, that has a plu

[ We claim:] [1.] A rotary pump for pumping fluid through a patient comprising:(a) a housing that has an inlet, an outlet and an inner surface, at least a region of which is curved;(b) a stator member attached to said housing comprising:(b.sub.1) a substantially conically shaped nose, that has a plurality of stationary blades, disposed at the inlet to define an inlet flow passage between the nose and the inner surface;(b.sub.2) a substantially conically shaped tail disposed at the outlet and having a plurality of stationary blades, disposed around the tail, the curved region of the inner surface conforming to the substantially conically shaped tail to define an outlet flow passage between the tail and the inner surface; and(b.sub.3) a mid-section disposed between the nose and the tail, the mid-section having a curved portion that connects the nose to the tail;(c) a rotatable impeller for pumping fluid positioned within said housing and around the mid-section, the impeller comprising a hub that comprises:(c.sub.1) an exterior surface, about which a plurality of outboard blades are disposed, a primary flow passage being defined between the exterior surface and the curved region of the inner surface of the housing, the primary flow passage being in fluid communication with the inlet flow passage and the outlet flow passage; and(c.sub.2) an interior surface that is curved to conform to the curvature of the curved portion of the mid-section of the stator to define a smooth secondary flow passage that is in fluid communication with the inlet flow passage and the outlet flow passage, the primary flow passage being disposed in a divergent relationship with the outlet flow passage so that fluid diverges as the fluid flows from the primary flow passage to the outlet flow passage and thereby preventing flow recirculation, the primary flow passage being larger than the secondary flow passage, the fluid flowing through the inlet flow passage through the primary flow passage and then through either the outlet flow passage or the secondary flow passage during operation of the pump; and(d) a first stack of magnets disposed within the impeller and aligned with a second stack of magnets disposed in the mid-section of the stator member, the first and the second stacks of magnets defining a magnetic radial bearing.