Expandable mechanical hemodynamic support systems, devices, and methods

A method for deploying a percutaneous blood flow assist device to a target location within a patient, the method comprising:

• advancing, through an incision of the patient, an elongate delivery sheath device, the delivery sheath device defining a sheath lumen that contains a housing component slidably disposed in the sheath lumen, the housing component comprising:
• an elongate drive shaft housing defining a housing lumen;
• a pump housing disposed at a distal end portion of the drive shaft housing;
• and
• an inlet cannula extending distally from the pump housing,
• wherein the pump housing and the inlet cannula are radially reconfigurable between:
• (i) low-profile configurations when radially constrained in the sheath lumen and (ii) radially expanded configurations when unconstrained by the delivery sheath device;
• retracting, when the pump housing is at the target location, the delivery sheath device relative to the housing component to express the inlet cannula and the pump housing out from the sheath lumen;
• inserting a rotatable inner catheter into the housing lumen of the drive shaft housing, wherein the inner catheter comprises:
• an elongate flexible drive shaft;
• and
• a pump impeller disposed at a distal end of the drive shaft,
• wherein the pump impeller is in a radially collapsed configuration when within the housing lumen;
• advancing the inner catheter relative to the housing component to position the pump impeller within the pump housing;
• and
• expanding the pump impeller to a radially expanded operable configuration while the pump impeller is within the pump housing.