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;
a first row of blades extending from the proximal portion of the hub, the first row of blades comprising a first plurality of circumferentially-spaced blades, wherein each blade of the first row of blades has a blade first proximal end and a blade first distal end, and wherein the hub comprises a first diameter at the blade first distal end and a second diameter at the blade first proximal end that is larger than the first diameter;
a second row of blades extending from the distal portion of the hub, the second row of blades comprising a second plurality of circumferentially-spaced blades, wherein the first plurality of blades is circumferentially offset with respect to the second plurality of blades about a surface of the hub.
2. The impeller of claim 1 , wherein the first row is positioned at the proximal end portion and the second row is positioned at the distal end portion.
3. The impeller of claim 1 , wherein the first row of blades and the second row of blades each comprise at least two blades.
4. The impeller of claim 1 , wherein the first row of blades and the second row of blades each comprise at least three blades.
5. The impeller of claim 1 , wherein the first row of blades and the second row of blades each comprise an equal number of blades.
6. The impeller of claim 1 , wherein each blade of the second row of blades has a second proximal end and second distal end, wherein a circumferential gap defined along the hub between the first distal end and the second proximal end.
7. The impeller of claim 6 , wherein an axial gap is defined between the first distal end and the second proximal end along the hub.
8. The impeller of claim 6 , wherein the first distal end and the second proximal end are axially aligned along the hub.
9. The impeller of claim 1 , wherein each blade of the first row of blades and the second row of blades wraps helically around the hub.
10. 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
a first row of blades extending from the proximal portion of the hub, the first row of blades comprising a first plurality of circumferentially-spaced blades, wherein each blade of the first row of blades has a blade first proximal end and a blade first distal end, and wherein the hub comprises a first diameter at the blade first distal end and a second diameter at the blade first proximal end that is larger than the first diameter;
a second row of blades extending from the distal portion of the hub, the second row of blades comprising a second plurality of circumferentially-spaced blades, wherein the first plurality of blades is circumferentially offset with respect to the second plurality of blades about a surface of the hub.
11. The catheter pump of claim 10 , wherein the first row is positioned at the proximal end portion and the second row is positioned at the distal end portion.
12. The catheter pump of claim 10 , wherein the first row of blades and the second row of blades each comprise at least two blades.
13. The catheter pump of claim 10 , wherein the first row of blades and the second row of blades each comprise at least three blades.
14. The catheter pump of claim 10 , wherein the first row of blades and the second row of blades each comprise an equal number of blades.
15. The catheter pump of claim 10 , wherein each blade of the second row of blades has a second proximal end and second distal end, wherein a circumferential gap defined along the hub between the first distal end and the second proximal end.
16. The catheter pump of claim 15 , wherein an axial gap is defined between the first distal end and the second proximal end along the hub.
17. The catheter pump of claim 15 , wherein the first distal end and the second proximal end are axially aligned along the hub.
18. The catheter pump of claim 10 , wherein each blade of the first row of blades and the second row of blades wraps helically around the hub.
19. A method of storing an impeller within a sheath for a catheter pump, the method comprising:
providing a hub having a proximal end portion and a distal end portion, the hub supporting at least a first row of blades and a second row of blades, wherein each of the first row of blades and the second row of blades comprises a plurality of blades, wherein the blades of the first row are circumferentially offset with respect to the blades of the second row about a surface of the hub, wherein each blade of the first row of blades has a blade first proximal end and a blade first distal end, and wherein the hub comprises a first diameter at the blade first distal end and a second diameter at the blade first proximal end that is larger than the first diameter;
inserting the hub into the sheath; and
collapsing the first row of blades and the second row of blades into a stored configuration such that the plurality of blades do not overlap when in a stored configuration.