A Kirschner wire 10 for use in endoscopic surgery is provided, as well as methods and apparatus for installing and removing Kirschner wire 10. However, if the packet of data is to receive the preferred level of service then checking whether it is permissible to forward the packet to a device in the network at the current time. Various heuristics are described to enable different implementations for different situations or scenarios. The radius of the chamfered portion 16 of the substrate is 0. For example, a copolymer perfluorodecyl methacrylate and 2-nitrobenzyl methacrylate is a suitable orthogonal fluorinated photoresist for use with fluorinated solvents and supercritical carbon dioxide in a photolithography process. Particularly, the tops of wires are wound to form hooks to hold the fuse.