A thin walled elongated hollow lumen medical device structure comprised at least in part of a cylindrical flexible circuit 100 with a flexible substrate 105. The cylindrical flexible circuit 100 is configured in such a way to carry at least part of the devices structural loads and therefore reduce the medical device total wall thickness. An exemplary embodiment of the invention structure comprises a hollow lumen medical catheter where a flexible circuit 100 comprises the entire inner lumen and the outer lumen is comprised of a polymer extrusion.
