초록 ▼

An axial flow blood pump for intracorporeal or extracorporeal use pumps blood axially through a cylindrical conduit disposed in the bloodstream of a patient. The pump further includes a pump stator mounted in the conduit and a motor stator located either externally or internally of the conduit which

An axial flow blood pump for intracorporeal or extracorporeal use pumps blood axially through a cylindrical conduit disposed in the bloodstream of a patient. The pump further includes a pump stator mounted in the conduit and a motor stator located either externally or internally of the conduit which applies a magnetic flux in the conduit. A rotor located in the conduit carries permanent magnets which interact with the applied magnetic flux to rotate the rotor. The rotor also carries impeller blades which, during rotation, produces an axial flow of blood through the conduit. During rotor rotation, the rotor is radially suspended solely by one or more hydrodynamic bearings formed by blood flowing through the conduit, with the location of at least one hydrodynamic bearing defined by a radial gap between the inside surface of the conduit and the rotor. By radially suspending, or floating, the rotor on blood in the conduit, the size of the pump may be reduced and the need for radial bearings, radial bearing seals and/or a supply of purge fluid is eliminated.

대표청구항 ▼

An axial flow blood pump for pumping blood through a patient\s bloodstream comprising: a cylindrical conduit adapted to be disposed in the bloodstream of the patient, the conduit having an internal surface defining a central axial passageway for blood passage therethrough, the passageway having an i

An axial flow blood pump for pumping blood through a patient\s bloodstream comprising: a cylindrical conduit adapted to be disposed in the bloodstream of the patient, the conduit having an internal surface defining a central axial passageway for blood passage therethrough, the passageway having an inner diameter; a pump stator mounted within the conduit, the pump stator including axially displaced inlet and outlet sections; a cylindrical motor stator located externally of the passageway through the conduit so as to be out of contact with the blood flowing therethrough, the motor stator having windings and a control circuit to create flux in the conduit between the inlet and outlet pump stator sections; a rotor axially positioned in the conduit between the inlet and outlet stator sections, the rotor having an outer surface with an outer diameter less than said conduit inner diameter, thereby to define an annular radial gap between the rotor outer surface and the conduit internal surface when the rotor is radially centered in the conduit, the rotor further including, a plurality of impeller blades, at least one permanent magnet adapted to interact with said applied flux to rotate the rotor to produce axial blood flow through the passageway from the inlet stator section to the outlet stator section; whereby, during rotor rotation, the rotor is suspended radially inside the conduit so as to float on the blood and this result is accomplished solely by a hydrodynamic effect created by the presence of said blood flowing within said annular radial gap.