Integrated coil vascular devices

A microcatheter device comprising a gradient flexibility profile that generally increases in flexibility toward a distal end of the device, the device comprising:

• a tube structure comprising a wall defining an interior lumen, a distal section, a proximal section, and a transition point between the distal section and the proximal section, wherein the proximal section is longer than the distal section, and wherein the distal section extends from the transition point to a distal terminal end of the tube structure and the proximal section extends from the transition point to a proximal terminal end of the tube structure;
• an integral coil extending from the distal end of the tube structure to the transition point, the integral coil being integrally formed as part of the tube structure as a result of a spiral cut pattern along a length of the distal section of the tube structure, the integral coil providing the distal section of the tube structure greater flexibility than the proximal section of the tube structure;
• and
• a plurality of cuts formed in the proximal section, the plurality of cuts forming a plurality of axially extending beams and a plurality of circumferentially extending rings, wherein the plurality of cuts of the proximal section consist of cuts that form the axially extending beams and circumferentially extending rings such that cuts forming axially extending beams and circumferentially extending rings are the only cuts in the tube structure between the proximal terminal end and the transition point.