F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
F04B 17/00 (2006.01) A61M 1/10 (2006.01) F03B 13/00 (2006.01) F04D 3/00 (2006.01) F04D 13/06 (2006.01) F04D 29/04 (2006.01) H02K 1/27 (2006.01) H02K 7/09 (2006.01) H02K 7/14 (2006.01) A61M 1/12 (2006.01)
Patent
CA 2377934
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).
L'invention concerne une pompe à sang (10) comportant de préférence un rotor (44) suspendu magnétiquement qui tourne à l'intérieur d'un logement (12). Des paliers (fig. 3) magnétiques radiaux peuvent être définis à l'intérieur du stator et du rotor afin de suspendre le rotor. La pompe (10) peut comporter en outre un palier (64) magnétique axial pouvant être un palier magnétique passif (fig. 6-7, 11-13) ou actif (fig. 10, 14-16). On peut placer un moteur entraînant le rotor à l'intérieur du logement pour dissiper plus facilement la chaleur produite par le moteur. Un trajet d'écoulement primaire est défini entre le rotor et le stator, et un trajet d'écoulement secondaire est défini entre le stator et le rotor. De préférence, la majeure partie du sang passe par le trajet d'écoulement primaire. Le trajet d'écoulement secondaire est assez grand pour assurer un rinçage adéquat de celui-ci, et assez petit pour permettre un fonctionnement efficace des paliers magnétiques radiaux dans le trajet d'écoulement secondaire.
Antaki James F.
Burgreen Gregory
Groom Nelson J.
Paden Bradley
National Aeronautics And Space Administration
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
University Of Pittsburgh
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