Abstract: A hollow catheter segment comprising a longitudinally extending slot region including a slot, at least one longitudinally backbone region and longitudinally extending intermediate regions between either adjacent backbone regions or between one of the backbone regions and the slot region, the slot and backbone regions being all disjoint from each other, the slot region, at least one backbone region and intermediate regions being all distributed circumferentially around the driving section. The catheter segment includes plurality of first and second slits extending radially therethrough and disjoint from each other, each first slit extending around the catheter segment between slot region first and second side edges and the second slits each extending between one of a backbone region first and second side edges and either a backbone region first or second side edges of an adjacent backbone region or the slot.