Pumps – Motor driven – Motor within rotary pumping member
Reexamination Certificate
2006-07-04
2006-07-04
Freay, Charles G. (Department: 3746)
Pumps
Motor driven
Motor within rotary pumping member
C417S356000, C417S365000, C417S423120, C623S003140
Reexamination Certificate
active
07070398
ABSTRACT:
A blood pump has an impeller rotatably disposed and magnetically suspended within a cavity of a stator by a plurality of magnetic bearings including an axial bearing to support the impeller axially in the cavity. The axial bearing includes adjacent impeller magnets and adjacent stator magnets with axially aligned polarities and reverse polarities with respect to adjacent magnets. A motor includes impeller magnets on the impeller and coils and poles associated with the stator. Radial permanent magnet and electromagnetic bearings are also included. The magnetic bearings and the motor have stator magnets or coils and poles disposed radially across the fluid passage from corresponding impeller magnets to define an annular gap positioned radially between the impeller and the stator, and positioned radially between all of the plurality of magnetic bearings, creating a straight through blood path without secondary flow paths.
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Allaire Paul E.
Jiang Wei
Kipp Ronald
Li Guoxin
Lin Zongli
Freay Charles G.
Medforte Research Foundation
Thorpe North & Western
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