Here’s how the Flex-Coil® Swivel System works. A reusable shoe with adhesive backing is mounted to the top, center of the cage. A primary I.V. set from the fluids or infusion pump leads to the Flex-Coil® swivel. The swivel with attached coil and injection site snaps into the shoe. The end of the coil attaches to a releasable collar, traditional collar or neck I.D. band. An extension set attaches between the end of the coil and a I.V. catheter.