Centrifugal blood pump device
AssigneeTerumo Kabushiki Kaisha
InventorTakehisa Mori
Life of this patent
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Abstract
A pump device (10) includes a housing (30) including a blood inflow port (38) through which blood flows in, and having a fixed-side repulsive magnet (44) disposed in an annular manner; and an impeller (14) that is rotatably housed inside the housing (30), and having a movable-side repulsive magnet (56) disposed in an annular manner. The fixed-side repulsive magnet (44) is disposed in a position offset toward the blood inflow port (38) side relative to the movable-side repulsive magnet (56). In the fixed-side repulsive magnet (44) and the movable-side repulsive magnet (56), a fixed-side repulsive surface (44a) and a movable-side repulsive surface (56a) adjacent to each other have the same polarity.
Claims18
A pump device comprising:
- an impeller in which a first repulsive magnet is disposed in an annular manner;
- and
- a housing that rotatably houses therein the impeller, and includes a cylindrical inner space into which a fluid flows via an inlet port facing a vertically-oriented rotation axis of the impeller, and in which a second repulsive magnet is disposed in an annular manner;
- wherein the second repulsive magnet is disposed in a position offset vertically along the rotation axis relative to the first repulsive magnet so as not to face each other radially;
- and
- wherein the first repulsive magnet and the second repulsive magnet respectively have magnetic pole surfaces adjacent to each other with the same polarity producing a repulsive force between the first repulsive magnet and the second repulsive magnet that pushes the impeller radially inward and vertically downward around an entire circumference of the impeller.
A blood pump for a blood circulation system, comprising:
- a housing defining a chamber having a cylindrical inner space, an inlet port arranged to convey a blood flow into the chamber, and an outlet port arranged to convey blood out of the chamber;
- an impeller disposed for rotation in the inner space around a vertically-oriented rotation axis to increase a pressure of the blood, wherein an upward levitation force is created on the impeller during impeller rotation at a high speed;
- and
- a magnetic bearing for limiting inclination and levitation of the impeller within the chamber comprising a first repulsive magnet disposed annularly within the impeller and a second repulsive magnet disposed annularly within the housing, wherein the first repulsive magnet and the second repulsive magnet respectively have magnetic pole surfaces adjacent to each other having a same magnetic polarity, and wherein the second repulsive magnet is disposed in a position offset in the direction of the rotation axis toward the inlet port relative to the first repulsive magnet so as not to face each other radially, whereby a repulsive magnetic force acts on the impeller having components directed both radially inward toward the rotation axis and vertically downward away from the inlet port around a full circumference of the impeller.
Dependencies are inferred from the claim text.