Sealless rotary blood pump
First Claim
1. A sealless blood pump, comprising:
- a pump housing, having an inlet tube on one end and an impeller casing on the other end, said casing including a outlet;
a rotor mounted for rotation within said housing, said rotor having an elongated shaft portion and an impeller attached to said shaft portion, said impeller being located within said impeller casing;
radial magnetic bearings carried by said shaft portion, and radial magnetic bearings carried by said housing for maintaining said shaft portion of said rotor within said inlet tube of said housing;
a rotor motor, said motor including a plurality of permanent magnets carried by said impeller and a motor stator including an electrically conductive coil located within said housing; and
a ring of back iron fixed to said casing to aid in completing a flux return path for said permanent magnets.
4 Assignments
0 Petitions
Accused Products
Abstract
An implantable rotary sealless blood pump is provided. The pump includes a housing having an inlet tube on one end and an impeller casing on the other end. A rotor is mounted for rotation within the housing, with the rotor having an elongated shaft portion and an impeller attached to the shaft portion. The impeller is located within the impeller casing. Radial magnetic bearings are carried by the shaft portion and radial magnetic bearings are carried by the housing for maintaining the shaft portion of the rotor within the inlet tube of the housing. A rotor motor includes a plurality of permanent magnets carried by the impeller and a motor stator including an electrically conductive coil located within the housing. A ring of back iron is carried by the impeller to aid in completing a flux return path for the permanent magnets. A plurality of hydrodynamic thrust bearings are located outside of the axis of rotation of the rotor. The impeller uses large axially thick blade sectors with narrow blood channels extending through the impeller, to minimize hemolysis and to increase the working surface of the blades.
336 Citations
34 Claims
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1. A sealless blood pump, comprising:
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a pump housing, having an inlet tube on one end and an impeller casing on the other end, said casing including a outlet; a rotor mounted for rotation within said housing, said rotor having an elongated shaft portion and an impeller attached to said shaft portion, said impeller being located within said impeller casing; radial magnetic bearings carried by said shaft portion, and radial magnetic bearings carried by said housing for maintaining said shaft portion of said rotor within said inlet tube of said housing; a rotor motor, said motor including a plurality of permanent magnets carried by said impeller and a motor stator including an electrically conductive coil located within said housing; and a ring of back iron fixed to said casing to aid in completing a flux return path for said permanent magnets. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A sealless blood pump, comprising:
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a pump housing, having an inlet tube in inlet tube on one end and in impeller casing on the other end, said casing including an outlet; a rotor mounted for rotation within said housing, said rotor having an elongated shaft portion and an impeller attached to said shaft portion, said impeller being located within said impeller casing; radial magnetic bearings carried by said shaft portion, and radial magnetic bearings carried by said housing for maintaining said shaft portion of said rotor within said inlet tube of said housing; a rotor motor, said motor including a plurality of permanent magnets carried by said impeller and a motor stator including an electrically conductive coil located within said housing; and a plurality of hydrodynamic thrust bearings located outside of the axis of rotation of said rotor. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A sealless blood pump, comprising:
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a pump housing, having an inlet tube on one end and an impeller casing on the other end, said casing including an outlet; a rotor mounted for rotation within said housing, said rotor having an elongated shaft portion and an impeller attached to said shaft portion, said impeller being located within said impeller casing; said impeller comprising a disk-shaped member having a central, upper face portion attached to one end of said shaft, said impeller having a plurality of blade sectors, each of said sectors being separated from an adjacent sector by a channel extending from said upper face portion to a lower face portion; said channels serving as a fluid path through the impeller and functioning to increase the effective working area of the impeller; and a plurality of hydrodynamic thrust bearings located outside of the axis of rotation of said rotor. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A sealless blood pump, comprising:
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a pump housing, said housing having an inlet tube on one end and an impeller casing on the other end, said casing including a discharge tube; a rotor mounted for rotation within said housing, said rotor having an elongated shaft portion and an impeller attached to said shaft portion, said impeller being located within said impeller casing and having a diameter between 1 inch and 1.5 inch; radial magnetic bearings carried by said shaft portion, and radial magnetic bearings carried by said housing for maintaining said shaft portion of said rotor coaxially within said inlet tube of said housing, a primary flow channel for blood being provided by an annular volume between said shaft and said radial magnetic bearings carried by said housing, said primary flow channel having a thickness between 0.06 inch and 0.1 inch. - View Dependent Claims (21, 22)
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23. A sealless blood pump, comprising:
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a pump housing, having an inlet tube on one end and an impeller casing on the other end, said casing including an outlet; a rotor mounted for rotation within said housing, said rotor having an elongated shaft portion and an impeller attached to said shaft portion, said impeller being located within said impeller casing; a rotor motor, said motor including a plurality of permanent magnets carried by said impeller, a first motor stator including an electrically conductive coil located within said housing and a second motor stator including an electrically conductive coil located within said housing; said first motor stator and said second motor stator being located on opposite sides of said impeller. - View Dependent Claims (24, 25, 26, 27)
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28. A sealless blood pump, comprising:
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an impeller comprising a disk-shaped member having a diameter between 1 inch and 1.5 inch; an impeller shaft; said impeller including a central, upper face portion attached to one end of said shaft; said impeller having a plurality of blade sectors, each of said sectors being separated from an adjacent sector by a channel extending from said upper face portion to a lower face portion; said impeller blade depth being between 0.2 inch and 0.5 inch; said channels having a width between 0.05 inch to 0.2 inch; said channels serving as a fluid path through the impeller and functioning to increase the effective working area of the impeller. - View Dependent Claims (29, 30)
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31. A sealless blood pump, comprising:
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a pump housing, having an inlet tube on one end and an impeller casing on the other end, said casing including an outlet; a rotor mounted for rotation within said housing, said rotor having an elongated shaft portion and an impeller attached to said shaft portion, said impeller being located within said impeller casing; a rotor motor, said motor including a plurality of magnets carried by said impeller and a motor stator including an electrically conductive coil and a pole piece located within said housing, said magnets and said stator being positioned to function to transmit torque and to provide a restoring radial magnetic force between said stator and magnets that would tend to return a radially deflected impeller to a neutral position. - View Dependent Claims (32, 33, 34)
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Specification