Radial drive for implantable centrifugal cardiac assist pump

Details Radial drive for implantable centrifugal cardiac assist pump Radial drive for implantable centrifugal cardiac assist pump

1989-07-10

1991-09-03

Casaregola, Louis J.

Pumps

Motor driven

Electric or magnetic motor

41742313, 417365, F04B 1702

Patent

active

050448978

ABSTRACT:
A centrifugal pump for left ventricle assist includes a pump housing forming an impeller chamber with inlet and outlet passages and enclosing an impeller rotatable to move blood or other fluids through the impeller chamber, and a rotor chamber enclosing a rotor integral with the impeller and rotatable to drive the impeller. A stator is mounted outside of a rotor casing forming the rotor chamber, concentric with, radially outward of and approximately axially aligned with the rotor. The stator includes a stator frame with an annular back iron and twenty-four teeth equally spaced apart and projected radially inwardly of the back iron. Three wires, one for each of three motor phases, are wound about the back iron, each including four symmetrically arranged active segments toroidally wound about the back iron, corresponding to four poles in a permanent magnet fixed to the rotor. Successive coils are wound in opposite toroidal directions, corresponding to an alternating and opposite arrangement of the poles of the magnet.

REFERENCES:
patent: 3576380 (1971-04-01), Sargeant
patent: 3983433 (1976-09-01), Sims
patent: 3983434 (1976-09-01), Sims
patent: 4569638 (1986-02-01), Harker et al.
patent: 4812108 (1989-03-01), Kotera
patent: 4895493 (1990-01-01), Kletschka
patent: 4898518 (1990-02-01), Hubbard et al.

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