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Implantable blood pump

  • US 9,675,741 B2
  • Filed: 06/10/2015
  • Issued: 06/13/2017
  • Est. Priority Date: 08/20/2010
  • Status: Active Grant
First Claim
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1. A method for assisting blood circulation in a patient, the method comprising:

  • drawing a flow of blood from a patient'"'"'s heart into a blood flow channel formed by a housing;

    passing the flow of blood through a motor stator disposed within the housing and to a rotor disposed within the blood flow channel, the motor stator comprising a plurality of stator poles arranged circumferentially around the blood flow channel, the rotor having a rotor axis of rotation and including at least one rotor magnet for rotation and levitation of the rotor within the blood flow channel;

    controlling delivery of current to a plurality of drive coils to generate electromagnetic fields to interact with the at least one rotor magnet to rotate the rotor to pump blood through the blood flow channel, each of the drive coils being wound around a respective one of the plurality of stator poles, each of the stator poles axially overlapping with the at least one rotor magnet in the direction of the rotor axis of rotation;

    controlling delivery of current to a plurality of levitation coils to generate electromagnetic fields to interact with the at least one rotor magnet to control a radial position of the rotor within the blood flow channel transverse to the rotor axis of rotation, each of the levitation coils being wound around a respective one or more of the plurality of stator poles;

    levitating the rotor within the blood flow channel in the direction of the rotor axis of rotation via a passive magnetic interaction between the at least one rotor magnet and ferromagnetic material of the plurality of stator poles; and

    outputting the flow of blood from the blood flow channel to the patient.

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