Magnetically driven axial-flow pump

• US 20010009645A1
• Filed: 12/27/2000
• Published: 07/26/2001
• Est. Priority Date: 01/26/2000
• Status: Active Grant

• Current Assignee: Nipro Corporation
• Original Assignee: Nipro Corporation
• Inventors: Noda, Hiroyuki
• Granted Patent: US 6,527,521 B2
• Time in Patent Office: Days
• US Class Current: 417/355
• CPC Class Codes: A61M 60/10 Location thereof with respect to the patient's body
• CPC Class Codes: A61M 60/148 in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
• CPC Class Codes: A61M 60/237 the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps
• CPC Class Codes: A61M 60/422 the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
• CPC Class Codes: A61M 60/806 Vanes or blades
• CPC Class Codes: F04D 13/0646 the hollow pump or motor shaft being the conduit for the working fluid
• CPC Class Codes: F04D 3/02 of screw type
• CPC Class Codes: H02K 7/14 Structural association with mechanical loads, e.g. with hand-held machine tools or fans with fan or impeller for cooling the machine H02K9/06
• CPC Class Codes: Y10S 415/90 Rotary blood pump

Abstract

A magnetically driven axial-flow pump comprising (i) an electromagnet unit 1 arranged about the periphery of a pipe “P”, (ii) a cylindrical rotor 5 accommodated in the pipe “P”, (iii) permanent magnets 6 mounted on the periphery of the rotor 5, and (iv) a spiral vane 7 formed on the inner surface of the rotor 5. A hollow is formed in the axial center portion of the vane 7. Because the rotor 5 and the vane 7 can be made as one piece with an NC machine, precluding the occurrence of gaps in the otherwise-inevitable joint between them, it is easy to make the rotor 5 and the vane 7. Because there are no gaps between the rotor 5 and the vane 7 as mentioned above and there is no object in contact with blood in the center portion of the vane, various germs do not enter blood, no thrombi are formed, blood tissues are not destroyed, and hence the pump is suitable as a blood pump.

Claims

1. A magnetically driven axial-flow pump comprising:

an electromagnet unit arranged about the periphery of a pipe;

a cylindrical rotor accommodated in the pipe;

permanent magnets mounted on the periphery of the rotor; and

a spiral vane formed on the inner surface of the rotor,

a hollow being formed in the axial center portion of the vane.