A mechanical thrombectomy apparatus for removing a clot from a vessel, the apparatus comprising:- an elongate inversion support comprising a catheter having a distal end and a distal end opening；- a tractor comprising a flexible tube extending longitudinally within the catheter and doubling back over the distal end of the catheter to invert and extend over the distal end of the catheter； and- a puller coupled to a first end of the tractor and configured to pull the tractor proximally to invert the tractor over the distal end opening, characterized in that- the flexible tube comprises longitudinally alternating regions of higher and lower stiffness, wherein the regions of higher stiffness have a stiffness that is greater than the regions of lower stiffness.
