A respiratory assistance device may include a tube that forms a main channel for connecting a distal end of the tube to a respiratory airway of a patient, such that the main channel connects the respiratory system of the patient to the outside. The component includes a central core encompassed by a plastic or elastic layer, which is provided with the at least one groove, where the groove is designed for holding the cable or tube element within it, while allowing the cable or tube element to move substantially radially in the groove when the umbilical is bent and that the layer is made from several plastic or elastic elements. In some embodiments, an implant replaces one or more vertebral bodies of the spine. A shell is produced based on the characteristic feature. 0% IACS and a tensile strength in a range of 8,500 to 14,000 psi; without subjecting the rod to an annealing treatment, drawing the rod into wire: and stranding the wire into cable to form the overhead transmission conductor. The selection module interacts with a selection criteria library and a user interface dialogue model library to determine an appropriate user interface.