Medical device with support member

A catheter comprising:

• an inner tubular member having a central longitudinal axis and a lumen extending therethrough, wherein the lumen is open to a distal opening at a distalmost extent of the catheter;
• and
• a coil surrounding an outer surface of the inner tubular member;
• wherein the coil is formed from one or more filars forming a plurality of windings;
• wherein the coil includes a first filar region and a second filar region located distal of the first filar region;
• wherein each filar of the one or more filars has a first cross-sectional area along the first filar region and each filar of the one or more filars has a second cross-sectional area along the second filar region, the second cross-sectional area being less than the first cross-sectional area;
• wherein the first cross-sectional area has a first centroid and the second cross-sectional area has a second centroid;
• wherein each filar of the one or more filars directly contacts the outer surface of the distal region of the inner tubular member throughout the first filar region and the second filar region such that the second centroids of each filar along the first filar region is located closer to the central longitudinal axis than the first centroids of each filar along the second filar region;
• wherein longitudinal spacing between adjacent windings of the plurality of windings increases in a distal direction along the second filar region;
• and
• wherein the first centroids of the adjacent windings of the plurality of windings within the first filar region are spaced a first longitudinal distance apart and the second centroids of the adjacent windings of the plurality of windings within the second filar region are spaced a second longitudinal distance apart;