MAGNETICALLY LEVITATED AND DRIVEN BLOOD PUMP AND METHOD FOR USING THE SAME
First Claim
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1. A device for pumping blood, comprising:
- a housing having a distal end adapted to be coupled to a catheter, a proximal end having an outlet, and a tubular body extending between said first distal and proximal ends along an axis;
a rotor rotatably disposed within the housing;
a first magnetic bearing operative to levitate the rotor along the axis within the housing;
a second magnetic bearing controlling a rotational frequency of the rotor; and
a third magnetic bearing controlling a radial position of the rotor.
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Accused Products
Abstract
A device for pumping blood, includes a housing having a distal end adapted to be coupled to a catheter, a proximal end having an outlet, and a tubular body extending between the distal and proximal ends along an axis. A rotor is rotatably disposed within the housing. A first magnetic bearing is operative to levitate the rotor along the axis within the housing. A second magnetic bearing controls a rotational frequency of the rotor. A third magnetic bearing controls a radial position of the rotor.
61 Citations
45 Claims
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1. A device for pumping blood, comprising:
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a housing having a distal end adapted to be coupled to a catheter, a proximal end having an outlet, and a tubular body extending between said first distal and proximal ends along an axis; a rotor rotatably disposed within the housing; a first magnetic bearing operative to levitate the rotor along the axis within the housing; a second magnetic bearing controlling a rotational frequency of the rotor; and a third magnetic bearing controlling a radial position of the rotor. - 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)
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26. A device for pumping blood, comprising:
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a housing having a distal end adapted to be coupled to a catheter, a proximal end having an outlet, and a tubular body extending between the distal and proximal ends along an axis; a rotor rotatably disposed within the housing; a first magnetic bearing further comprising first and second permanent magnets and operative to levitate the rotor to an axial position within the housing; a second magnetic bearing further comprising a plurality of vertically arranged pairs of electromagnetic coils and a pole structure coupled to the rotor, the second magnetic bearing configured to change or maintain a rotational frequency of the rotor; a third magnetic bearing further comprising the plurality of vertically arranged pairs of electromagnetic coils and the first permanent magnet, the third magnetic bearing configured to change or maintain a radial position of the rotor; a Hall Effect sensor sensing the radial position and rotational frequency of the rotor; and a controller operably coupled to the Hall effect sensor and configured to communicate with the coils to change or maintain the radial position and rotational frequency of the rotor.
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27. A method of operating a rotor of a blood pump, comprising:
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levitating the rotor within a tubular body along an axis of the blood pump using a first magnetic bearing; rotating the rotor about the axis within the tubular body using a second magnetic bearing; and maintaining a radial position of the rotor relative to the axis using a third magnetic bearing. - View Dependent Claims (28)
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29. The method of 27, further comprising:
sensing a rotational frequency and the radial position of the rotor. - View Dependent Claims (30, 31, 32, 33)
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34. A method of operating a rotor of a blood pump, comprising:
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levitating the rotor within a tubular body of the blood pump using a first magnetic bearing, the first magnetic bearing comprising a first permanent magnet and a second permanent magnet, the second permanent magnet operatively coupled with the rotor; commencing rotation of the rotor within the tubular body using a second magnetic bearing, the second magnetic bearing further comprising; a plurality of vertically arranged pairs of coils circumferentially disposed around the housing and the first permanent magnet; and a pole structure coupled to the rotor; sensing a rotational frequency and a radial position of the rotor; when the sensed rotational frequency is below a threshold level, sending a current to at least one pair of coils, thereby further rotating the rotor; and when the sensed radial position of the rotor deviates from a threshold position relative to the axis, sending a current to at least one pair of coils, thereby urging the rotor towards the axis. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. The method of 40, wherein the current is sent to two adjacent pairs of coils.
Specification