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US 6,264,635 B1Granted
Active magnetic bearing system for blood pump
AssigneeKriton Medical, Inc.
InventorsRichard K. Wampler, David M. Lancisi
Life of this patent
Estimating the term…
Abstract
An implantable rotary blood pump including a rotor mounted for rotation within a pump housing. The rotor has a shaft portion and an impeller carried by the shaft portion. A rotor motor is provided, with the motor including a plurality of permanent magnets carried by the impeller and motor stators on opposite sides of the impeller. The motor is operable to transmit torque and also to provide an axial magnetic force that acts as an axial bearing.
Claims15
A rotary blood pump, comprising:
- a pump housing;
- a rotor mounted for rotation within said housing, said rotor having an impeller;
- a rotor motor, said motor including a plurality of permanent magnets carried by said impeller and a motor stator including electrically conductive coils and pole pieces located within said housing;
- said motor being operable to transmit torque and also to provide an axial magnetic force that acts as an axial bearing.
1 more element
A rotary blood pump, comprising:
- a pump housing;
- a rotor mounted for rotation within said housing, said rotor having an impeller;
- a rotor motor, said motor including a plurality of permanent magnets carried by said impeller, a first motor stator positioned on one side of said impeller and a second motor stator positioned on an opposite side of said impeller;
- said motor stators each including electrically conductive coils and pole pieces located within said housing;
- said motor being operable to transmit torque and also to provide an axial magnetic force that acts as an axial bearing.
2 more elements
A rotary blood pump, comprising:
- a pump housing;
- a rotor mounted for rotation within said housing, said rotor having an impeller;
- a plurality of permanent magnets carried by said impeller;
- a first motor stator on one side of said impeller for coaction with said permanent magnets carried by said impeller;
- a second motor stator located on the opposite side of said impeller for coaction with said permanent magnets carried by said impeller;
- said first motor stator comprising a first plurality of coils and pole pieces;
- said second stator comprising a second plurality of coils and pole pieces;
- a circuit for energizing said first and second stators;
- a detector for detecting a position of said impeller;
- the energization of said stators being responsive to said detector for varying the position of said impeller in response to an output from said detector.
7 more elements
A method for controlling a rotary blood pump, which comprises the steps of:
- providing a pump housing;
- providing a rotor mounted for rotation within said housing, said rotor having an impeller;
- providing a rotor motor which includes a plurality of permanent magnets carried by said impeller and a motor stator;
- and
- operating said motor to transmit torque and also to provide an axial magnetic force that acts as an axial bearing.
2 more elements
A method for controlling a rotary blood pump, which comprises the steps of:
- providing a pump housing;
- providing a rotor mounted for rotation within said housing, said rotor having a shaft portion and an impeller carried by said shaft portion;
- providing a rotor motor, said motor including a plurality of permanent magnets carried by said impeller, a first motor stator positioned on one side of said impeller and a second motor stator positioned on an opposite side of said impeller;
- operating said motor to transmit torque and also to provide an axial magnetic force that acts as an axial bearing;
- detecting axial movement of said impeller;
- and
- providing current to said stators in response to said detection step.
4 more elements
A method of controlling a rotary blood pump, which comprises the steps of:
- providing a pump housing;
- providing a rotor for rotation within said housing, said rotor having an impeller;
- providing a plurality of permanent magnets carried by said impeller;
- providing a first motor stator on one side of said impeller for coaction with said permanent magnets carried by said impeller;
- providing a second motor stator located on the opposite side of said impeller for coaction with said permanent magnets carried by said impeller;
- energizing said first and second stators;
- detecting the axial position of said impeller;
- energizing said stators in response to said detection of said axial position of said impeller to vary the position of said impeller.
5 more elements
A method for controlling a rotary blood pump, which comprises the steps of:
- providing a pump housing;
- providing a rotor for rotation within said housing, said rotor having an impeller;
- providing a plurality of permanent magnets carried by said impeller;
- providing a first motor stator on one side of said impeller for coaction with said permanent magnets carried by said impeller;
- providing a second motor stator located on the opposite side of said impeller for coaction with said permanent magnets carried by said impeller;
- detecting the axial position of said impeller;
- and
- unbalancing the currents to the two stators in response to the detecting step for providing a magnetic restoring force to move the impeller axially.
5 more elements
Dependencies are inferred from the claim text.