Split stator for motor/blood pump
AssigneeNu-Tech Industries, Inc.
InventorMilton S. Isaacson
Life of this patent
Estimating the term…
Abstract
A motor/blood pump which axially pumps blood to a patient connected to a heart/lung machine includes a cylindrical pump housing, a rotor located in the housing, at least one impeller blade attached to the rotor, a pair of stator halves mechanically connectable to the outside of the housing and a motor controller electrically connected to the stator halves. The controller electrically actuates the interconnected stator halves to rotatably drive the rotor on a hydrodynamic bearing of the blood in the housing, and the impeller blade axially pumps blood through the housing. Mechanically and electrically interconnectable stator halves enable the reusable stator to be connected to and disconnected from the disposable pump housing without interrupting the blood flow path.
Claims20
A motor/blood pump combination comprising:
- an axial flow blood pump including a cylindrical housing;
- a motor to drive the pump, the motor including a pair of stator halves surrounding and mechanically connectable to the housing to form a stator for driving the pump;
- and
- a rotor located within the housing and rotatably driven by the stator, the rotor being rotatable within the housing on a hydrodynamic bearing, whereby the pump is easily removable from the housing by separating the stator halves.
A motor/blood pump combination for pumping blood and a blood compatible liquid through a conduit connected between a patient and a heart/lung machine:
- a cylindrical axial pump housing connectable along the conduit to pump blood and blood compatible liquid therethrough;
- a rotor assembly located inside the housing, the rotor assembly being rotatable within the housing on a hydrodynamic bearing, the rotor assembly including at least one impeller blade adapted to pump blood and/or blood compatible liquid through the housing during rotation;
- a pair of stator halves mechanically connected to the housing to form a stator assembly thereabout and the stator halves electrically connected to each other outside of the stator assembly, wherein the stator halves are mechanically connected along a midplane which longitudinally divides the pump housing and each of the stator halves has a plurality of windings, each of the windings located entirely on one side of the midplane;
- and
- control means electrically connected to both stator halves to electrically actuate the stator halves to rotatably drive the rotor assembly to pump blood and/or blood compatible fluid through the conduit.
The motor/blood pump combination of claim 12 wherein the rotor assembly has two sets of axially spaced impeller blades and the pump housing has three stages of pump stator blades.
A motor/blood pump combination for pumping blood along a blood flow path comprising:
- a cylindrical pump housing located along the blood flow path;
- at least one set of pump stator blades fixedly mounted within the housing;
- a rotor held axially within the housing and rotatable within the housing on a hydrodynamic bearing when a magnetic field is applied within the hosing;
- at least one set of impeller blades connected to the rotor and adapted to coact with the stator blades to pump blood from an inlet of the housing toward an outlet of the housing when the rotor is rotated;
- a pair of stator halves mechanically connected to the housing to form a housing assembly in radial alignment with the rotor, the stator halves being electrically connected exterior of the stator assembly and adapted to create a varying magnetic field within the housing to drive the rotor, wherein the stator halves are mechanically connected along a midplane which longitudinally divides the pump housing and each of the stator halves has a plurality of windings, each of the windings located entirely on one side of the midplane;
- and
- a controller electrically connected to the stator halves and adapted to electrically actuate the stator halves to drive the rotor at a predetermined rotary speed to pump blood through the housing at a flow rate of about six liters per minute and at a pressure of about 300 mmHg of pressure.
A motor/pump combination comprising:
- a cylindrical pump housing;
- a rotor located inside the housing, the rotor being rotatable within the housing while supported on a hydrodynamic bearing therebetween;
- at least one impeller blade connected to the rotor and rotatable therewith;
- a stator assembly of at least two stator sections mechanically connected to the housing, wherein the stator sections are mechanically connected along a midplane which longitudinally divides the pump and each of the stator sections has a plurality of windings, each of the windings located entirely on one side of the midplane;
- and
- control means electrically connected to each stator section and adapted to electrically actuate the stator sections to drivably rotate the rotor and said at least one impeller blade, thereby to pump liquid through the housing.
A motor comprising:
- a rotor;
- sleeve means circumscribing the rotor;
- a pair of spaced cam bearings carried by the sleeve means;
- and
- a stator assembly with a bore therethrough, the bore being sized to circumscribe the sleeve means, the stator assembly further including two stator halves mechanically connected to the cam bearings, the stator assembly adapted to rotatably drive the rotor.
Dependencies are inferred from the claim text.