Infusion systems and related methods involving a catheter hub and an extension or IV administration set having a male Luer connector for fluid communication with the catheter hub. A support adaptor is provided with the extension or IV administration set and has a body with a length between first and second ends, and a body wall having a continuous wall surface in a radial direction relative to the length and which defines an exterior of the body. An internal wall of the support adaptor defines a bore with the body wall, wherein the bore has first and second openings. A tubing length is located in the bore and extends out of the second opening. The bore includes first and second bore sections. Optionally, the second bore section is angled relative to the first bore section. A support surface is located beneath the bore, elevation wise.
