Abstract: A breathing tube support arm for supporting a patient's breathing tube(s) includes a system of hollow, interlocking, articulating devices, and a system of stiffeners inside of said hollow, articulating devices, the system including stiffeners of three different stiffnesses. An embodiment includes a system of hollow, interlocking, articulating devices, a system of stiffeners inside the hollow articulating devices, the system including stiffeners of three different stiffnesses, a connector at a base end of the support arm for receiving a universal rail mount block, and a tube holder or connector for receiving a tube holder at a top end of the support arm.