Systems and methods of branch circuit load estimation are disclosed. The invention utilizes rollers that are centrally positioned on corresponding support members which support a pair of angled wings the roller sides. In another preferred embodiment of the present invention, a grid is positioned in front of the nozzle so that a dispersement of sterilization agent from within the container sterilizes the grid when the nozzle are activated. Where the device is a single use drug delivery system, a packaged drug forms an integral part of the device. A distance L between an outer periphery of the circuit region and an inner periphery of the seal ring region and a minimum interval Wmin in mutual intervals of the metal wires have a relationship of \u201c1\u2266\u22663\u201d. In addition, the input data may be examined with a view to their integrity with little expenditure compare to calculating the cryptographic algorithm itself.