CATHETER BLOOD PUMPS AND IMPELLERS
Catheter blood pumps that include an expandable pump portion extending distally from a catheter. The pump portions may include an expandable impeller housing that includes an expandable blood conduit defining a blood lumen. The pump portions may include a collapsible impeller that includes a collapsible and optionally inflatable hub and one or more collapsible blades extending from the hub.
1 . A catheter blood pump, comprising:
an expandable pump portion extending distally from a catheter, the pump portion including an expandable impeller housing that includes an expandable blood conduit defining a blood lumen, and
a collapsible impeller comprising a collapsible and inflatable hub and one or more blades extending from the hub, the inflatable hub having a ramped surface that is disposed at least partially proximal to a proximal end of the blood conduit, the ramped surface positioned relative to the proximal end of the blood conduit to create a least partial radial flow at an outflow of the pump portion,
the inflatable hub having an internal volume to facilitate fluid delivery to the internal volume to increase fluid pressure within the internal volume of the hub.
2 . The blood pump of claim 1 , wherein the inflatable hub further comprises a proximal non-bladed section, the proximal non-bladed having an outer profile with a tapered configuration that tapers downward in a proximal direction, the outer profile at least partially facilitating collapse of the inflatable hub.
3 . The blood pump of claim 1 , wherein the ramped surface is in a bladed region of the inflatable hub.
4 . The blood pump of claim 1 , wherein the internal volume is greater a deployed configuration than in a collapsed delivery configuration.
5 . The blood pump of claim 1 , wherein the one or more impeller blades are not in fluid communication with the internal volume.
6 . The blood pump of claim 1 , wherein the impeller hub comprises at least one material such that the impeller hub is stiffer after the inflation fluid is delivered to the impeller hub.
7 . The blood pump of claim 1 , wherein the inflatable hub comprises a first section with a first thickness, and a second section with a second thickness different than the first thickness.
8 . The blood pump of claim 7 , wherein the first section and the second section comprises polymeric material.
9 . The blood pump of claim 1 , wherein the internal volume is adapted to be in fluid communication with a purge fluid source, the purge fluid source adapted to be disposed outside a patient's body.
10 . The blood pump of claim 1 , wherein the hub includes a bladed region with a trumpet configuration, the one or more blades disposed in the bladed region.
11 . The blood pump of claim 1 , wherein the inflatable hub is inflatable in a bladed region and is inflatable in a non-bladed region.
12 . The blood pump of claim 11 , wherein the internal volume includes a bladed internal volume and a non-bladed internal volume.
13 . The blood pump of claim 12 , wherein the bladed internal volume is greater than the internal non-bladed volume when the hub is inflated.
14 . The blood pump of claim 12 , wherein the bladed internal volume is less than the internal non-bladed volume when the hub is inflated.
15 . The blood pump of claim 1 , wherein the inflatable hub comprises a compliant or semi-compliant material.
16 . The blood pump of claim 1 , wherein the inflatable hub comprises at least one material such that it self-expands to an at least partially deployed configuration upon release of a sheathing force.
17 . The blood pump of claim 16 , wherein the inflatable hub deforms from the self-expanded configuration after the fluid delivery.
18 . The blood pump of claim 1 , wherein at least one surface that is part of the impeller hub is deformable from a collapsed delivery position to a fully deployed configuration in which an outermost dimension of the at least one surface, relative to a long axis of the impeller, is greater in the fully deployed configuration than it is in the collapsed delivery position.
19 . The blood pump of claim 18 , wherein the at least one surface is configured to at least partially self-expand, and wherein the at least one surface is adapted to be pressurized after at least partial self-expansion upon delivery of the fluid.
20 . The blood pump of claim 1 , wherein the inflatable hub comprises a plurality of support members adapted and configured to provide radial support to the inflatable hub.
21 - 58 . (canceled)