Patent ID: 7972122
Filing Date: 2011-07-05
Classification: A61M,F04D

Abstract:
1. A blood pump, comprising: a pump housing; a plurality of rotors within said housing aligned along a common rotational axis; each of said rotors having a plurality of discrete substantially axially directed flow channels which are spaced from each other and extend from one end of said rotor to the other end of said rotor, each of said flow channels having an approximate 90° offset along the axis of said rotor from an inlet entrance to an outlet exit; each of said rotors having discrete non-channel portions intermediate said flow channels; said flow channels being in a shape tending to drive blood in said channels through said housing in such axial direction when rotated; said flow channels collectively having a total width at the radial periphery of the rotor that is equal to or substantially less than the collective total width of the non-channel portions of said rotor at said radial periphery; and a motor comprising a plurality of magnetic poles carried by each of said rotors and a plurality of electromagnetic windings adjacent said magnetic poles for magnetic interaction therewith such that at least two of said rotors may be rotated in opposite directions.