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1. (WO2001002724) BLOOD PUMP HAVING A MAGNETICALLY SUSPENDED ROTOR

Pub. No.:    WO/2001/002724    International Application No.:    PCT/US2000/018098
Publication Date: Fri Jan 12 00:59:59 CET 2001 International Filing Date: Sat Jul 01 01:59:59 CEST 2000
IPC: A61M 1/10
A61M 1/12
F04D 3/00
F04D 13/06
F04D 29/04
H02K 1/27
H02K 7/09
H02K 7/14
Applicants: UNIVERSITY OF PITTSBURGH
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
Inventors: ANTAKI, James, F.
PADEN, Bradley
BURGREEN, Gregory
GROOM, Nelson, J.
Title: BLOOD PUMP HAVING A MAGNETICALLY SUSPENDED ROTOR
Abstract:
A blood pump (500) preferably has a magnetically suspended rotor (502) that rotates within a housing (506). The rotor (502) may rotate about a stator (504) disposed within the housing. Radial magnetic bearings (560) may be defined within a stator (504) and a rotor (502) in order to suspend the rotor (502). The radial magnetic bearings (560) may be passive magnetic bearings that include permanent magnets disposed within the stator and the rotor or active magnetic bearings. The pump (500) may further include an axial magnetic bearing (562) that may be either a passive or an active magnetic bearing. A motor stator (508) that drives the rotor may be disposed within the housing in order to more easily dissipate heat generated by the motor stator (508). A primary flow path (552) is defined between the stator (504) and the rotor (502), and a secondary flow path (552) is defined between the stator (504) and the rotor (502). Preferably, a substantial majority of blood passes through the primary flow path (550). The secondary flow path (552) is large enough so that it provides adequate flushing of the secondary flow path (552) while being small enough to permit efficient operation of the radial magnet bearings (560) across the secondary path (552).