A percutaneous circulatory support device including a percutaneous blood pump coupled to a distal end region of an elongate shaft at a junction. The percutaneous blood pump is configured to pump blood through a housing of the percutaneous blood pump during use. The junction includes an end cap at a proximal end of the percutaneous blood pump surrounding and secured to a distal end region of the elongate shaft at the junction. The junction may include a fillet of material surrounding a proximal end region of the end cap and extending proximally thereof and surrounding an exterior surface of the elongate shaft. The proximal end region of the end cap may include an annular side wall with one or more apertures and/or one or more grooves extending into the annular side wall in which the fillet of material extends into.