Neurovascular distal access support catheters, aspiration catheters, or device shafts

An aspiration catheter configured to be advanced at least partially within a patient proximate to an obstruction to aspirate the obstruction therefrom, the aspiration catheter comprising:

• a flexible and hollow shaft including a proximal end and a distal end, the flexible and hollow shaft including a first segment with a first pattern of slotted openings and a second segment extending proximally relative to the first segment with a second pattern of slotted openings, the second pattern of slotted openings having a different slot angle and longitudinal spacing than the first pattern of slotted openings, wherein the first pattern includes a first repeating helical pattern of cut and uncut portions extending circumferentially around and along a length of the first segment and wherein the second pattern includes a second repeating helical pattern of cut and uncut portions extending circumferentially around and along a length of the second segment, wherein a combined arc length of circumferentially adjacent cut and uncut portions along the helical pattern of the first pattern or second pattern is between 100 degrees and 180 degrees.