Rotary blood pump
First Claim
1. A blood pump, comprising:
- a pump housing comprising a flow tube having a blood flow path therethrough, a blood inlet, and a blood outlet;
a stator attached to the pump housing, the stator having a stator field winding for producing a stator magnetic field;
a rotor located within the flow tube for rotation in response to the stator magnetic field, the rotor comprising an inducer and an impeller;
the inducer comprising an inducer hub and at least one inducer blade attached to the inducer hub;
the impeller being located downstream of the inducer, and comprising an impeller hub and at least one impeller blade attached to the impeller hub; and
a diffuser located within the flow tube downstream of the impeller, and comprising a diffuser hub and at least one diffuser blade attached to the diffuser hub;
where the diffuser hub has an upstream end and the impeller hub has a downstream end, and the upstream end of the diffuser hub has a diameter greater than the diameter of the downstream end of the impeller hub.
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Accused Products
Abstract
A blood pump that comprises a pump housing having a blood flow path therethrough, a blood inlet, and a blood outlet; a stator mounted to the pump housing, the stator having a stator field winding for producing a stator magnetic field; a flow straightener located within the pump housing, and comprising a flow straightener hub and at least one flow straightener blade attached to the flow straightener hub; a rotor mounted within the pump housing for rotation in response to the stator magnetic field, the rotor comprising an inducer and an impeller; the inducer being located downstream of the flow straightener, and comprising an inducer hub and at least one inducer blade attached to the inducer hub; the impeller being located downstream of the inducer, and comprising an impeller hub and at least one impeller blade attached to the impeller hub; and preferably also comprising a diffuser downstream of the impeller, the diffuser comprising a diffuser hub and at least one diffuser blade. Blood flow stagnation and clot formation within the pump are minimized by, among other things, providing the inducer hub with a diameter greater than the diameter of the flow straightener hub; by optimizing the axial spacing between the flow straightener hub and the inducer hub, and between the impeller hub and the diffuser hub; by optimizing the inlet angle of the diffuser blades; and by providing fillets or curved transitions between the upstream end of the inducer hub and the shaft mounted therein, and between the impeller hub and the shaft mounted therein.
314 Citations
39 Claims
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1. A blood pump, comprising:
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a pump housing comprising a flow tube having a blood flow path therethrough, a blood inlet, and a blood outlet; a stator attached to the pump housing, the stator having a stator field winding for producing a stator magnetic field; a rotor located within the flow tube for rotation in response to the stator magnetic field, the rotor comprising an inducer and an impeller; the inducer comprising an inducer hub and at least one inducer blade attached to the inducer hub; the impeller being located downstream of the inducer, and comprising an impeller hub and at least one impeller blade attached to the impeller hub; and a diffuser located within the flow tube downstream of the impeller, and comprising a diffuser hub and at least one diffuser blade attached to the diffuser hub; where the diffuser hub has an upstream end and the impeller hub has a downstream end, and the upstream end of the diffuser hub has a diameter greater than the diameter of the downstream end of the impeller hub. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A blood pump, comprising:
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a pump housing comprising a flow tube having a blood flow path therethrough, a blood inlet, and a blood outlet; a stator secured to the pump housing, the stator having a stator field winding for producing a stator magnetic field; a flow straightener that is located within the flow tube and is secured to the flow tube, and comprising a flow straightener hub and at least one flow straightener blade attached to the flow straightener hub; a rotor located within the flow tube for rotation in response to the stator magnetic field, the rotor comprising an inducer and an impeller; the inducer being located downstream of the flow straightener, and comprising an inducer hub and at least one inducer blade attached to the inducer hub; the impeller being located downstream of the inducer, and comprising an impeller hub and at least one impeller blade attached to the impeller hub; a diffuser that is located within the flow tube downstream of the impeller and is secured to the flow tube, and comprising a diffuser hub and at least one diffuser blade attached to the diffuser hub; a front bearing assembly which comprises a front shaft that is attached to the inducer hub, and a bearing supporting one end of the front shaft, the bearing being mounted on the downstream end of the flow straightener hub; a curved transition between the upstream end of the inducer hub and the front shaft; a rear bearing assembly which comprises a rear shaft that is attached to the downstream end of the impeller hub, and a bearing supporting one end of the rear shaft, the bearing being mounted on the upstream end of the diffuser hub; and a curved transition between the downstream end of the impeller hub and the rear shaft; where the upstream end of the inducer hub has a diameter greater than the diameter of the downstream end of the flow straightener hub; and where there is an axial gap between the downstream end of the flow straightener hub and the upstream end of the inducer hub, and the size of that gap induces a single blood recirculation flow pattern in the gap.
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32. A blood pump implant assembly, comprising:
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a pump housing comprising a flow tube having a blood flow path therethrough, a blood inlet, and a blood outlet; a stator attached to the pump housing, the stator having a stator field winding for producing a stator magnetic field; a rotor located within the flow tube for rotation in response to the stator magnetic field, the rotor comprising an inducer and an impeller; the inducer comprising an inducer hub and at least one inducer blade attached to the inducer hub; and the impeller being located downstream of the inducer, and comprising an impeller hub and at least one impeller blade attached to the impeller hub; a diffuser located within the flow tube downstream of the impeller, and comprising a diffuser hub and at least one diffuser blade attached to the diffuser hub; and at least one sewing ring which is attached to the housing of the blood pump; where the diffuser hub has an upstream end and the impeller hub has a downstream end, and the upstream end of the diffuser hub has a diameter greater than the diameter of the impeller hub at its downstream end. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39)
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Specification