Impeller for catheter pump
An impeller for a pump is disclosed herein. The impeller can include a hub having a fixed end and a free end. The impeller can also have a plurality of blades supported by the hub. Each blade can have a fixed end coupled to the hub and a free end. The impeller can have a stored configuration and a deployed configuration, the blades in the deployed configuration extending away from the hub, and the blades in the stored configuration being compressed against the hub.
1. An impeller for a catheter pump, the impeller comprising:
a hub having a proximal end portion and a distal end portion; and
at least one blade supported by the hub and transitionable between a stored position and a deployed position, wherein the at least one blade wraps around the hub by a wrapping angle greater than about 150 degrees.
2. The impeller of claim 1 , wherein the wrapping angle is less than about 220 degrees.
3. The impeller of claim 1 , wherein the at least one blade has a curved profile with a radius of curvature, and wherein the radius of curvature in the deployed position is approximately the same as the radius of curvature in the stored position.
4. The impeller of claim 1 , wherein the at least one blade comprises two or three blades extending from the hub an arranged in a single row.
5. The impeller of claim 1 , wherein the at least one blade comprises:
a distal blade angle defined between a plane perpendicular to a free end of the blade near a distal end of the blade and a plane perpendicular to the hub;
a proximal blade angle defined between a plane perpendicular to a free end of the blade near a proximal end of the blade and a plane perpendicular to the hub; and
a middle blade angle defined between a plane perpendicular to the free end of the blade at a middle portion of the blade and a plane perpendicular to the hub, wherein the distal blade angle is larger than the middle blade angle, and wherein the middle blade angle is larger than the proximal blade angle.
6. The impeller of claim 1 , wherein the wrapping angle is between about 180 degrees and about 200 degrees.
7. The impeller of claim 1 , wherein the wrapping angle is 210 degrees.
8. The impeller of claim 1 , wherein the wrapping angle is selected to facilitate folding the blade into the stored position.
9. The impeller of claim 1 , wherein the at least one blade includes a first fillet formed at a fixed end of the blade on a suction side, and a second fillet formed at the fixed end of the blade on a pressure side.
10. The impeller of claim 9 , wherein the first fillet supports the blade during rotation, and wherein the second fillet assists in folding the blade into the stored configuration.
11. The impeller of claim 9 , wherein the first fillet has a larger radius that the second fillet.
12. A catheter pump comprising:
a catheter; and
an impeller mounted at an end of the catheter, the impeller comprising:
a hub having a proximal end portion and a distal end portion; and
at least one blade supported by the hub and transitionable between a stored position and a deployed position, wherein the at least one blade wraps around the hub by a wrapping angle greater than about 150 degrees.
13. The catheter pump of claim 12 , wherein the wrapping angle is less than about 220 degrees.
14. The catheter pump of claim 12 , wherein the at least one blade has a curved profile with a radius of curvature, and wherein the radius of curvature in the deployed position is approximately the same as the radius of curvature in the stored position.
15. The catheter pump of claim 12 , wherein the at least one blade comprises two or three blades extending from the hub an arranged in a single row.
16. The catheter pump of claim 12 , wherein the at least one blade comprises:
a distal blade angle defined between a plane perpendicular to a free end of the blade near a distal end of the blade and a plane perpendicular to the hub;
a proximal blade angle defined between a plane perpendicular to a free end of the blade near a proximal end of the blade and a plane perpendicular to the hub; and
a middle blade angle defined between a plane perpendicular to the free end of the blade at a middle portion of the blade and a plane perpendicular to the hub, wherein the distal blade angle is larger than the middle blade angle, and wherein the middle blade angle is larger than the proximal blade angle.
17. The catheter pump of claim 12 , wherein the wrapping angle is between about 180 degrees and about 200 degrees.
18. A catheter pump comprising:
an expandable cannula; and
an impeller positioned within the expandable cannula, the impeller comprising:
a hub having a proximal end portion and a distal end portion; and
at least one blade supported by the hub and transitionable between a stored position and a deployed position, wherein the at least one blade wraps around the hub by a wrapping angle greater than about 150 degrees.
19. The catheter pump of claim 18 , wherein the wrapping angle is less than about 220 degrees.
20. The catheter pump of claim 18 , wherein the at least one blade has a curved profile with a radius of curvature, and wherein the radius of curvature in the deployed position is approximately the same as the radius of curvature in the stored position.