A catheter pump, comprising: a motor; an elongated catheter body having a distal portion including; an expandable cannula (602, 702) disposed at the distal portion and having an inlet and an outlet, the expandable cannula (602, 702) having a delivery profile and an operational profile larger than the delivery profile; an impeller assembly including an impeller shaft (606, 706) and an impeller body including one or more blades (605, 705), the impeller shaft (606, 706) being coupled to the motor such that operation of the motor causes rotation of the impeller blades (605, 705) to draw blood into the expandable cannula (602, 702); and an expandable distal bearing support (601, 701) having a mounting portion (607, 707) disposed on the impeller shaft (606, 706) distal of the impeller body and configured to maintain a position of the impeller assembly relative to a cannula wall, characterised in that the expandable distal bearing support (601, 701) comprises a support member (608, 708) having: a proximal portion (614, 714) axially overlapping a distal portion of the impeller shaft (606, 706), the impeller shaft (606, 706) configured to rotate relative to the proximal portion (614, 714), and a lobe (616, 716) extending distally from the proximal portion (614, 714) and configured for relative movement with an inner surface of the expandable cannula (602, 702), the lobe (616, 716) forming the shape of a flower petal and/or a non-planar, compound curve or isomorphic shape and comprising a pair of proximal struts (623, 723) and a pair of distal struts (624, 724), each proximal strut (623, 723) being coupled or formed with the proximal portion (614, 714), at and distal ends of the proximal struts (623, 723) being coupled to proximal ends of the distal struts (624, 724). a motor; an elongated catheter body having a distal portion including; an expandable cannula (602, 702) disposed at the distal portion and having an inlet and an outlet, the expandable cannula (602, 702) having a delivery profile and an operational profile larger than the delivery profile; an impeller assembly including an impeller shaft (606, 706) and an impeller body including one or more blades (605, 705), the impeller shaft (606, 706) being coupled to the motor such that operation of the motor causes rotation of the impeller blades (605, 705) to draw blood into the expandable cannula (602, 702); and an expandable distal bearing support (601, 701) having a mounting portion (607, 707) disposed on the impeller shaft (606, 706) distal of the impeller body and configured to maintain a position of the impeller assembly relative to a cannula wall, characterised in that the expandable distal bearing support (601, 701) comprises a support member (608, 708) having: a proximal portion (614, 714) axially overlapping a distal portion of the impeller shaft (606, 706), the impeller shaft (606, 706) configured to rotate relative to the proximal portion (614, 714), and a lobe (616, 716) extending distally from the proximal portion (614, 714) and configured for relative movement with an inner surface of the expandable cannula (602, 702), the lobe (616, 716) forming the shape of a flower petal and/or a non-planar, compound curve or isomorphic shape and comprising a pair of proximal struts (623, 723) and a pair of distal struts (624, 724), each proximal strut (623, 723) being coupled or formed with the proximal portion (614, 714), at and distal ends of the proximal struts (623, 723) being coupled to proximal ends of the distal struts (624, 724). a proximal portion (614, 714) axially overlapping a distal portion of the impeller shaft (606, 706), the impeller shaft (606, 706) configured to rotate relative to the proximal portion (614, 714), and a lobe (616, 716) extending distally from the proximal portion (614, 714) and configured for relative movement with an inner surface of the expandable cannula (602, 702), the lobe (616, 716) forming the shape of a flower petal and/or a non-planar, compound curve or isomorphic shape and comprising a pair of proximal struts (623, 723) and a pair of distal struts (624, 724), each proximal strut (623, 723) being coupled or formed with the proximal portion (614, 714), at and distal ends of the proximal struts (623, 723) being coupled to proximal ends of the distal struts (624, 724).