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Blood pump having a magnetically suspended rotor

  • US 6,447,266 B2
  • Filed: 04/24/2001
  • Issued: 09/10/2002
  • Est. Priority Date: 06/26/1996
  • Status: Expired due to Term
First Claim
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1. A pump for pumping blood, comprising:

  • a housing;

    a stator disposed within the housing and coupled to the housing;

    a rotor disposed within the housing and suspended around the stator;

    the rotor and stator defining a primary blood flow path between the rotor and the housing and a secondary blood flow path between the rotor and the stator;

    at least two radial magnetic bearings for suspending the rotor between the stator and the housing, said radial magnetic bearings each comprising at least one stator suspension magnet disposed within the stator and at least one rotor suspension magnet disposed within the rotor, the stator and rotor suspension magnets communicating across the secondary flow path; and

    a motor for rotating the rotor with respect to the stator, said motor comprising at least one electromagnetic coil within the housing, said electromagnetic coil communicating with at least one rotor motor magnet in the rotor, said communication being across the primary flow path to rotate the rotor with respect to the stator and thereby pump blood through the pump.

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