Centrifugal blood pump apparatus
First Claim
1. A centrifugal blood pump apparatus comprising:
- a housing having a fluid inlet port and a fluid outlet port;
a centrifugal pump section including an impeller having a first magnetic material therein and rotatable inside said housing to feed a fluid by a centrifugal force generated during a rotation thereof;
an impeller rotational torque generation section for attracting and rotating said impeller;
and a hydrodynamic pressure groove formed at a portion of an inner surface of said housing at an impeller rotational torque generation section side or at a portion of a surface of said impeller at said impeller rotational torque generation section side,said impeller being rotatable without contacting said housing owing to an action of said hydrodynamic groove,an electromagnet for attracting said first magnetic material of said impeller or a second magnetic material provided on said impeller separately from said first magnetic material in a direction opposite to a direction in which said impeller rotational torque generation section attracts said first magnetic material and helping said impeller levitate;
a control mechanism for controlling said impeller rotational torque generating section and said electromagnet, said control mechanism starting rotation of said impeller rotational torque generating section with said electromagnet attracting said impeller thereto at a force not less than a predetermined value; and
wherein said impeller rotational torque generation section has a rotor having a magnet for attracting said first magnetic material of said impeller and a motor for rotating said rotor; and
said hydrodynamic pressure groove formed at the portion of the inner surface of said housing at a rotor-disposed side or the portion of the surface of said impeller at said rotor-disposed side, and said electromagnet attracting said first magnetic material or the second magnetic material in a direction opposite to the direction in which said magnet of said rotor attracts said first magnetic material to help said impeller levitate.
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0 Petitions
Accused Products
Abstract
A centrifugal blood pump apparatus has a centrifugal pump section including an impeller having a first magnetic material therein and rotating inside the housing to feed a fluid by a centrifugal force generated during a rotation thereof; an impeller rotational torque generation section having a rotor having a magnet for attracting the first magnetic material of the impeller thereto, and a motor for rotating the rotor; and a dynamic pressure groove formed at a portion, of an inner surface of the housing, located at a rotor-disposed side thereof. The centrifugal blood pump apparatus further includes an electromagnet for attracting the impeller in a direction opposite to a direction in which the magnet of the rotor attracts the impeller and helping the impeller levitate.
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Citations
12 Claims
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1. A centrifugal blood pump apparatus comprising:
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a housing having a fluid inlet port and a fluid outlet port; a centrifugal pump section including an impeller having a first magnetic material therein and rotatable inside said housing to feed a fluid by a centrifugal force generated during a rotation thereof; an impeller rotational torque generation section for attracting and rotating said impeller; and a hydrodynamic pressure groove formed at a portion of an inner surface of said housing at an impeller rotational torque generation section side or at a portion of a surface of said impeller at said impeller rotational torque generation section side, said impeller being rotatable without contacting said housing owing to an action of said hydrodynamic groove, an electromagnet for attracting said first magnetic material of said impeller or a second magnetic material provided on said impeller separately from said first magnetic material in a direction opposite to a direction in which said impeller rotational torque generation section attracts said first magnetic material and helping said impeller levitate; a control mechanism for controlling said impeller rotational torque generating section and said electromagnet, said control mechanism starting rotation of said impeller rotational torque generating section with said electromagnet attracting said impeller thereto at a force not less than a predetermined value; and wherein said impeller rotational torque generation section has a rotor having a magnet for attracting said first magnetic material of said impeller and a motor for rotating said rotor; and
said hydrodynamic pressure groove formed at the portion of the inner surface of said housing at a rotor-disposed side or the portion of the surface of said impeller at said rotor-disposed side, and said electromagnet attracting said first magnetic material or the second magnetic material in a direction opposite to the direction in which said magnet of said rotor attracts said first magnetic material to help said impeller levitate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A centrifugal blood pump apparatus comprising:
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a housing having a fluid inlet port and a fluid outlet port; a centrifugal pump section including an impeller having a first magnetic material therein and rotatable inside said housing to feed a fluid by a centrifugal force generated during a rotation thereof; an impeller rotational torque generation section for attracting and rotating said impeller; and a hydrodynamic pressure groove formed at a portion of an inner surface of said housing at an impeller rotational torque generation section side or at a portion of a surface of said impeller at said impeller rotational torque generation section side, said impeller being rotatable without contacting said housing owing to an action of said hydrodynamic groove, an electromagnet for attracting said first magnetic material of said impeller or a second magnetic material provided on said impeller separately from said first magnetic material in a direction opposite to a direction in which said impeller rotational torque generation section attracts said first magnetic material and helping said impeller levitate; and a control mechanism for controlling said impeller rotational torque generating section and said electromagnet, said control mechanism starting rotation of said impeller rotational torque generating section with said electromagnet attracting said impeller thereto at a force not less than a predetermined value; and wherein said impeller rotational torque generation section has a plurality of stator coils, disposed circumferentially to rotate said impeller, for attracting said first magnetic material of said impeller of said centrifugal blood pump section; and
said hydrodynamic pressure groove being formed at the portion of the inner surface of said housing at a stator coil-disposed side or at the portion of the surface of said impeller at said stator coil-disposed side thereof, and said electromagnet attracting said first magnetic material or the second magnetic material in a direction opposite to the direction in which said stator coils attract said first magnetic material and helping said impeller levitate.
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12. A centrifugal blood pump apparatus comprising:
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a housing having a fluid inlet port and a fluid outlet port; a centrifugal pump section including an impeller having a first magnetic material therein and rotatable inside said housing to feed a fluid by a centrifugal force generated during a rotation thereof; an impeller rotational torque generation section for attracting and rotating said impeller; and a hydrodynamic pressure groove formed at a portion of an inner surface of said housing at an impeller rotational torque generation section side or at a portion of a surface of said impeller at said impeller rotational torque generation section side; said impeller being rotatable without contacting said housing owing to an action of said hydrodynamic groove; an electromagnet for attracting said first magnetic material of said impeller or a second magnetic material provided on said impeller separately from said first magnetic material in a direction opposite to a direction in which said impeller rotational torque generation section attracts said first magnetic material and helping said impeller levitate; a control mechanism for controlling said impeller rotational torque generating section and said electromagnet, said control mechanism starting rotation of said impeller rotational torque generating section with said electromagnet attracting said impeller thereto at a force not less than a predetermined value; and wherein said centrifugal blood pump apparatus has a second hydrodynamic pressure groove formed at a portion of an inner surface of said housing at a electromagnet-disposed side or at a portion of a surface of said impeller at said electromagnet-disposed side.
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Specification