Magnetically driven axial-flow pump

• US 6,527,521 B2
• Filed: 12/27/2000
• Issued: 03/04/2003
• Est. Priority Date: 01/26/2000
• Status: Expired due to Fees

• Current Assignee: Nipro Corporation
• Original Assignee: Nipro Corporation
• Inventors: Noda, Hiroyuki
• Primary Examiner(s): Tyler, Cheryl J.
• Assistant Examiner(s): Solak, Timothy P.
• Application Number:
  US09/748,251
• Publication Number:
  US 20010009645A1
• Time in Patent Office: 797 Days
• Field of Search: 417/355, 417/356, 417/357, 417/423.14, 417/420, 415/900, 604/151
• 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 comprises an electromagnetic unit arranged about the periphery of a pipe. A cylindrical rotor is accommodated within the pipe and is equipped with permanent magnets mounted on the periphery. A spiral, hollow vane is formed on an inner surface of the rotor by either casting or by cutting, such as with a NC machine, thus precluding the occurrence of gaps between the rotor and the vane. The lack of gaps within the pump makes the pump suitable for use as a blood pump.

Claims

1. A magnetically driven axial-flow pump comprising:

a pipe having a retaining part comprising a first diameter portion and a second diameter portion, said second diameter portion having an inner diameter that is greater than that of said first diameter portion, and walls tapering outwardly from said first diameter portion and joining said first diameter portion and said second diameter portion;

an electromagnet unit arranged about the periphery of the retaining part of the pipe;

a cylindrical rotor and vane formed as a one-piece unit by cutting or casting and not having joints, said vane being a spiral vane on an inner surface of the rotor with a hollow in the axial center portion of the vane; and

permanent magnets mounted on the periphery of the cylindrical rotor to form a combination with the cylindrical rotor having an outer surface corresponding to an inner surface of said retaining part and movably arranged within said retaining part.