Low priming volume centrifugal blood pump
AssigneeBaxter International Inc.
InventorWilfred F. Mathewson
Life of this patent
Estimating the term…
Abstract
A low priming volume centrifugal pump comprising a disc shaped impeller having opposite faces and an inlet hole centrally disposed therein. The impeller has flow channels disposed on at least one of the faces of the impeller which radiate outward from said inlet hole. The volume of the flow channels is small relative to the total impeller envelope volume providing for efficient momentum transfer with a minimum of turbulence and backflow Thus, priming volume is reduced and flow within the pump is more efficient. The pump can be used as stand alone device, or it can be integrated with a blood oxygenator into a common housing.
Claims47
A low priming volume centrifugal blood pump comprising:
- a housing having an inlet;
- a disc shaped impeller enclosed within said housing, said impeller having first and second opposing faces and an inlet hole centrally disposed therein in fluid communication with said housing inlet;
- a gap between each of said impeller faces and the corresponding housing surface opposing said impeller face;
- and
- a plurality of flow channels, at least one of said flow channels disposed on and open to said first face and at least one of said flow channels disposed on and open to said second face, each of said flow channels radiating outwardly from and fluidly communicating with said inlet hole to a flow channel outlet, wherein the volume of said flow channels is small relative to the total impeller envelope volume.
The pump of claim I wherein the maximum dimension of said gap is between 0.020 and 0.050 inches.
A low priming volume centrifugal blood pump comprising:
- a housing having an inlet;
- a disc shaped impeller enclosed within said housing, said impeller having opposite faces and an inlet hole centrally disposed therein in fluid communication with said housing inlet;
- a gap between each of said impeller faces and the corresponding housing surface opposing said impeller face;
- a pair of flow channels disposed within each face of said impeller and open to said housing surfaces, each of said flow channels radiating outwardly from and fluidly communicating with said inlet hole to a flow channel outlet, each of said channels disposed from the radius of said impeller face, at said flow channel outlet, at an angle of approximately thirty degrees;
- and
- a camber near the edge of each of said flow channels such that said gap between said impeller face and said opposing housing surface varies between the flow channels;
- wherein the width and height of said flow channels are approximately equal and wherein the total volume of said inlet hole and said flow channels is less than 50% of the total impeller envelope volume.
Dependencies are inferred from the claim text.