A catheter pump, comprising: a motor ; an elongated catheter body having a distal portion including; an expandable cannula disposed at the distal portion and having an inlet and an outlet, the expandable cannula having a delivery profile and an operational profile larger than the delivery profile; an impeller assembly including an impeller shaft and an impeller body including one or more blades , the impeller shaft being coupled to the motor such that operation of the motor causes rotation of the impeller blades to draw blood into the expandable cannula ; and an expandable distal bearing support having a mounting portion disposed on the impeller shaft 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 comprises a support member having: a proximal portion axially overlapping a distal portion of the impeller shaft , the impeller shaft configured to rotate relative to the proximal portion , and a lobe extending distally from the proximal portion and configured for relative movement with an inner surface of the expandable cannula , the lobe forming the shape of a flower petal and/or a non-planar, compound curve or isomorphic shape and comprising a pair of proximal struts and a pair of distal struts , each proximal strut being coupled or formed with the proximal portion , at and distal ends of the proximal struts being coupled to proximal ends of the distal struts . a motor ; an elongated catheter body having a distal portion including; an expandable cannula disposed at the distal portion and having an inlet and an outlet, the expandable cannula having a delivery profile and an operational profile larger than the delivery profile; an impeller assembly including an impeller shaft and an impeller body including one or more blades , the impeller shaft being coupled to the motor such that operation of the motor causes rotation of the impeller blades to draw blood into the expandable cannula ; and an expandable distal bearing support having a mounting portion disposed on the impeller shaft 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 comprises a support member having: a proximal portion axially overlapping a distal portion of the impeller shaft , the impeller shaft configured to rotate relative to the proximal portion , and a lobe extending distally from the proximal portion and configured for relative movement with an inner surface of the expandable cannula , the lobe forming the shape of a flower petal and/or a non-planar, compound curve or isomorphic shape and comprising a pair of proximal struts and a pair of distal struts , each proximal strut being coupled or formed with the proximal portion , at and distal ends of the proximal struts being coupled to proximal ends of the distal struts . a proximal portion axially overlapping a distal portion of the impeller shaft , the impeller shaft configured to rotate relative to the proximal portion , and a lobe extending distally from the proximal portion and configured for relative movement with an inner surface of the expandable cannula , the lobe forming the shape of a flower petal and/or a non-planar, compound curve or isomorphic shape and comprising a pair of proximal struts and a pair of distal struts , each proximal strut being coupled or formed with the proximal portion , at and distal ends of the proximal struts being coupled to proximal ends of the distal struts . <EOS>