Intravascular blood pumps with struts and methods of use and manufacture
Catheter blood pumps that include an expandable pump portion, which include an expandable impeller housing. The housings include an expandable blood conduit that defines a blood lumen, and one or more pluralities of expandable struts extending axially from an end region of the expandable blood conduit. At least one of the pluralities of struts are non-unitary with a blood conduit at the end region.
1. A catheter blood pump, comprising:
an expandable pump portion extending distally from an elongate shaft, the pump portion including
an expandable impeller housing that includes
an expandable blood conduit defining a blood lumen, and a plurality of expandable struts coupled to and extending axially from an end region of the expandable blood conduit, the plurality of expandable struts non-unitary with an expandable scaffold at the end region, and
one or more expandable impellers disposed at least partially within the blood lumen.
2. The blood pump of claim 1 , wherein the plurality of expandable struts are disposed at an outflow of the pump portion.
3. The blood pump of claim 2 , wherein the plurality of expandable struts are proximal relative to a proximal end of the expandable blood conduit.
4. The blood pump of claim 1 , wherein the plurality of expandable struts are disposed at an inflow of the pump portion.
5. The blood pump of claim 4 , wherein the plurality of expandable struts are disposed distal relative to a distal end of the expandable blood conduit.
6. The blood pump of claim 1 , the blood pump further comprising a second plurality of struts extending axially from a second end region of the expandable blood conduit, wherein the second plurality of struts are non-unitary with the scaffold.
7. The blood pump of claim 6 , wherein the scaffold extends from the end region to the second end region.
8. The blood pump of claim 6 , wherein the scaffold is continuous from the end region to the second end region.
9. The blood pump of claim 7 , wherein the scaffold includes one or more discontinuities between the end region and the second end region.
10. The blood pump of claim 5 , wherein the scaffold includes first and second scaffold sections axially spaced apart.
11. The blood pump of claim 10 , wherein the first and second scaffold sections are disposed at first and second impeller regions.
12. The blood pump of claim 11 , wherein the blood conduit includes a central region in between the first and second scaffold sections, wherein the central region is void of a scaffold.
13. The blood pump of claim 1 , the blood pump further comprising a second plurality of expandable struts extending axially from a second end region of the expandable blood conduit, wherein the second plurality of struts are unitary with the scaffold.
14. The blood pump of claim 1 , wherein the plurality of expandable struts have a radial thickness greater than a radial thickness of the scaffold in the end region.
15. The blood pump of claim 1 , wherein the plurality of expandable struts extend from a common hub.
16. The blood pump of claim 1 , wherein each of the plurality of struts has a stiffness that is greater than a region of the scaffold to which it is coupled.
17. The blood pump of claim 1 , wherein the plurality of struts each have a first securing member secured to a second securing member of the scaffold.
18. The blood pump of claim 17 , wherein the first securing members are disposed at an end region of the struts.
19. The blood pump of claim 17 , wherein the first securing members comprise a bend in the strut.
20. The blood pump of claim 17 , wherein the first securing members including one or more projections that project away from an elongate strut body.
21. The blood pump of claim 17 , wherein the first securing members have a T configuration.
22. The blood pump of claim 17 , wherein the first securing members have a hook configuration.
23. The blood pump of claim 17 , wherein the second securing member comprises a bend in the scaffold.
24. The blood pump of claim 17 , wherein the second securing member has a valley configuration in the scaffold.
25. The blood pump of claim 17 , wherein the first securing members comprise an opening in the strut.
26. The blood pump of claim 25 , wherein the plurality of struts have closed free ends.
27. The blood pump of claim 25 , wherein the plurality of struts have open free ends, optionally including a plurality of fingers that define the open end.
28. The blood pump of claim 25 , wherein the first securing members comprise one or more projections extending from side arms of the strut, the projections partially defining the opening in the strut.
29. The blood pump of claim 25 , wherein the first securing members have a valley configuration comprising a bend.
30. The blood pump of claim 25 , wherein the second securing member comprises an elongate body that extends at least partially within the opening.
31. The blood pump of claim 30 , wherein the second securing member comprises one or more projections that project away from the elongate body member and interface with the strut.
32. The blood pump of claim 31 , wherein the one or more projections interface with first and second side arms of the strut.
33. The blood pump of claim 32 , wherein the first securing members are configured to provide for movement between first and second side portions of the strut to facilitate coupling with the scaffold.
34. The blood pump of claim 17 , wherein the first securing member and the second securing member are separately and together sized, positioned, and configured to engage one another such that one or more surfaces on each interact and cause a resistance to movement of one or both of the first and securing members in at least one direction.
35. The blood pump of claim 34 , wherein the first securing member and the second securing member are separately and together sized, positioned, and configured to engage one another such that one or more surfaces on each interact and cause a resistance to movement of one or both of the first and securing members in an axial direction.