Fluid pump

摘要

A rotary pump for pumping fluid through a patient comprises: (a) a housing (324) (b) a stator member (320) attached to said housing (324) and having a first portion, a second portion, and a plurality of stationary blades (334) attached to said stator member (320) at said first portion thereof, wherein said stator member is generally axially symmetric having a substantially conical-shaped tail and a substantially conical-shaped nose; (c) an impeller (322) positioned within said housing and having an exterior wall, an interior wall forming a void, a plurality of outboard blades (360) extending outwardly from said exterior wall, and a plurality of inboard blades (372) extending inwardly from said interior wall, wherein said stator member second portion extends within said interior wall of said impeller, and wherein said inboard impeller blades (372) are concave or convex (longitudinal curve) such that the curvature thereof corresponds with the curvature of said stator member (320); (d) means for levitating said impeller (322) which centres said impeller within said housing (324); and (e) means for rotating said impeller (322) which exerts and force on said plurality of impeller blades (372) to rotate said impeller. The impeller preferably has an ellipsoidal configuration.