A method is disclosed of applying a radiopaque marker to a cannula for use with an intracardiac pump, the method including: obtaining a band of radiopaque polymer material; placing the band around an outer diameter of the cannula, the cannula including a flexible tubular wall formed around and supported by a coil of shape memory material; placing a heat shrink tube around the band and the cannula; heating the band and the polymer tube to: soften the band, cause the heat shrink tube to shrink and apply force on the softened band towards the cannula, and cause the softened band to be welded to the cannula to form a radiopaque marker in a portion of the tubular wall; and removing the heat shrink tube.