Disposable magnetically-levitated centrifugal pump

Patent metadata

Field	Value
Publication number	US-9133847-B2
Application number	US-201013392879-A
Country	US
Kind code	B2
Filing date	Aug 27, 2010
Priority date	Aug 28, 2009
Publication date	Sep 15, 2015
Grant date	Sep 15, 2015

Abstract

A magnetically-levitated centrifugal pump comprises a pump head section and a pump section, where the pump section comprises a stator, a torque transmission disc, a motor, a displacement sensor, and a pump housing.

First claim

The invention claimed is:

1. A disposable magnetically-levitated centrifugal pump comprising a pump head section and a pump section, characterized in that, the pump head section which comprises:
a cylindrical rotor, which is made from magnetic material and has a ring-shaped rotor body, the cylindrical rotor having rotor protrusions at upper part and at lower part of internal circumference surface of the ring-shaped rotor body, the protrusions having specified width and protruding toward an inside direction of the ring-shaped rotor body;
an impeller which rotates accompanying with rotation of the cylindrical rotor; and
a pump head housing which comprises:
a fluid inlet;
a fluid outlet;
a space section in which the impeller is configured to rotate freely; and
a rotor accommodation section in which the cylindrical rotor is accommodated and is configured to rotate freely by means of magnetic force, the rotor accommodation section being configured to protrude from a bottom surface of the space section,

wherein the pump section comprises:
a stator which has:
a rotor insert section on the side of one end section, the rotor insert section having a depth larger than protrusion length of the rotor accommodation section and accommodating the rotor accommodation section in a manner that the rotor accommodation section is inserted in and removed from; a torque transmission disc which is formed by bonding ring components, which are made from material having low magnetic resistivity and comprise protrusion sections located facing the rotor protrusions, bonding one ring component between an upper ring shaped permanent magnet and a lower ring shaped permanent magnet,
which are magnetized in a thickness direction thereof, such that like-poles face each other, and placing another ring component on top of the upper ring-shaped permanent magnet, the torque transmission disc being disposed inside the rotor insert section and being configured to magnetically couple with the rotor;

a motor which is coupled to a rotating shaft inserted from the side of another end section of the stator to the side of the one end section, and which drives the torque transmission disc;
a displacement sensor which is disposed on the stator and measures displacement in radial directions of the rotor; and
a pump housing which comprises the stator, the torque transmission disc, the motor and the displacement sensor, the pump housing being able to accommodate the pump head section in a manner that the pump head section is inserted to and removed from,

wherein the stator further comprises an electro-magnet core which has a bottom plate section having a shaft hole going through the rotating shaft at the center, mounting sections which rise parallel to and in the same direction as the rotating shaft from end points of the bottom plate section, and one or a plurality of stator protrusion sections which protrude toward the central axis of the shaft hole on the upper part side of the mounting section, wherein the electro-magnet core is configured to magnetically couple with the lower ring shaped permanent magnet,
wherein the electromagnets for magnet bearings are formed by winding a coil around the electro-magnet core, and
wherein the torque transmission disc is fixed on the rotating shaft so that the upper ring-shaped permanent magnet is disposed against the rotor in the rotor insertion section and the upper ring-shaped permanent magnet and the lower ring-shaped permanent magnet are at a position between a top of the stator protrusions sections and the bottom plate section,
wherein the bottom plate section, the mounting sections and the stator protrusion section are made from magnetic material,
wherein the magnetic flux from the electro-magnet core enters the lower ring shaped permanent magnet from the bottom section of the lower ring shaped permanent magnet through the bottom plate section of the electro-magnet core.

2. The disposable magnetically-levitated centrifugal pump in accordance with claim 1 ,
wherein the rotor and the impeller are integrated by injection molding.

3. The disposable magnetically-levitated centrifugal pump in accordance with claim 1 , wherein the bottom plate section and the mounting sections are integrated.

4. The disposable magnetically-levitated centrifugal pump in accordance with claim 1 , wherein the electro-magnetic core contains four core sections.

Assignees

• Hijikata Wataru
• Shinshi Tadahiko
• Takatani Setsuo
• Tokyo Inst Tech
• Univ Tokyo Medical & Dental

Inventors

• Hijikata Wataru
• Shinshi Tadahiko
• Takatani Setsuo

Classifications

• F04D13/026

  Details of the bearings · CPC title

• F04D13/0633

  Details of the bearings · CPC title

• F04D13/025

  Details of the can separating the pump and drive area · CPC title

• F04D29/048

  magnetic; electromagnetic · CPC title

• F16C2316/18

  Pumps for pumping blood · CPC title