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US 5,360,317 AGranted
Centrifugal blood pump
AssigneeSpin Corporation
InventorsEarl W. Clausen, Lloyd C. Hubbard
Life of this patent
Estimating the term…
Abstract
A centrifugal pump for pumping biological fluids such as blood includes a housing which defines a pumping chamber. The pumping chamber encloses an impeller mounted on a spindle. The impeller carries coupling mechanisms which couple with an external source of rotation to rotate the impeller. The spindle allows the impeller to rotate freely, but both ends of the spindle are constrained in the axial and lateral directions. The housing includes an inlet and an outlet.
Claims12
A centrifugal pump for pumping biological fluids such as blood, adapted to be coupled with an external source of rotation, comprising:
- a housing defining a pumping chamber with an inlet and an outlet;
- a spindle enclosed within the pumping chamber for rotation about a spindle axis of rotation, the spindle comprising an inlet end toward the inlet of the pumping chamber and a base end opposite the inlet end;
- an impeller enclosed within the pumping chamber and being supported on the spindle in a spaced relationship to the external source of rotation, the impeller comprising coupling means for coupling with the external source of rotation for rotating the impeller about the spindle axis of rotation;
- an inlet journal bearing for rotatably supporting and receiving the inlet end of the spindle, the inlet journal bearing having a cylindrical inner side wall and an inner end surface;
- a base journal bearing for rotatably supporting and receiving the base end of the spindle, the base journal bearing having a cylindrical inner side wall and an inner end surface;
- and
- wherein the inner end surfaces of the inlet journal bearing and the base journal bearing are spaced a distance which is greater than a length of the spindle to define axial clearance between the spindle and the inner end surfaces of the bearings in order to avoid damaging blood cells.
4 more elements
A centrifugal pump for pumping biological fluids such as blood, comprising:
- a housing defining a pumping chamber with an inlet and an outlet;
- a spindle enclosed within the pumping chamber and positioned along a spindle axis, the spindle comprising an inlet end toward the inlet of the pumping chamber and a base end opposite the inlet end;
- means of rotation disposed externally of the pumping chamber;
- an impeller enclosed within the pumping chamber and being supported on the spindle in a spaced relationship to the means of rotation, the impeller comprising coupling means for coupling with the means of rotation for rotating the impeller about the spindle axis;
- an inlet journal bearing supported from the housing for rotatably supporting and receiving the inlet end of the spindle, the inlet journal bearing having a cylindrical inner side wall and an inner end surface;
- a base journal bearing supported from the housing for rotatably supporting and receiving the base end of the spindle, the base journal bearing, having a cylindrical inner side wall and an inner end surface;
- and
- wherein the inner end surfaces of the inlet journal bearing and the base journal bearing are spaced a distance which is greater than a length of the spindle to define axial clearance between the spindle and the inner end surfaces of the bearings in order to avoid damaging blood cells.
5 more elements
A centrifugal pump for pumping biological fluids such as blood, adapted to be coupled with an external source of rotation, comprising:
- a housing defining a pumping chamber with an inlet and an outlet;
- a spindle enclosed within the pumping chamber for rotation about a spindle axis, the spindle comprising an inlet end and a base end opposite the inlet end;
- an impeller enclosed within the pumping chamber and being supported on the spindle in a spaced relationship to the external source of rotation, the impeller comprising coupling means for coupling with the external source of rotation for rotating the impeller about the spindle axis of rotation;
- an inlet journal bearing embedded in an inlet wall of the pumping chamber for rotatably supporting and receiving the inlet end of the spindle, the inlet journal bearing having a cylindrical inner side wall and an inner end surface;
- a base journal bearing supported from the housing for rotatably supporting and receiving the base end of the spindle, the base journal bearing having a cylindrical inner side wall and an inner end surface;
- and
- wherein the inner end surfaces of the inlet journal bearing and the base journal bearing are spaced a distance which is greater than a length of the spindle to define axial clearance between the spindle and the inner end surfaces of the bearings in order to avoid damaging blood cells.
4 more elements
A centrifugal pump for pumping biological fluids such as blood, comprising:
- a housing defining a pumping chamber with an inlet and an outlet;
- a spindle enclosed within the pumping chamber and positioned along a spindle axis, the spindle comprising an inlet end inserted in a first journal bearing, the first journal bearing having a cylindrical inner side wall and an inner end surface and a base end inserted in a second journal bearing opposite the inlet end, the second journal bearing having a cylindrical inner side wall and an inner end surface, wherein the first journal bearing is embedded in an inlet wall of the pumping chamber and the inner end surfaces are spaced a distance which is greater than a length of the spindle to define axial clearance between the spindle and the inner end surfaces of the bearings in order to avoid damaging blood cells;
- means of rotation disposed externally of the pumping chamber;
- and
- an impeller enclosed within the pumping chamber and being supported on the spindle in a spaced relationship to the means of rotation, the impeller comprising coupling means for coupling with the means of rotation for rotating the impeller about the spindle axis.
2 more elements
Dependencies are inferred from the claim text.