Cannulas; Cannulas for anaesthetics with receptacles; Oxygen masks for medical purposes; Oxygen masks for medical use; Oxygen concentrators for medical applications; Oxygen concentrators for medical purposes; Respirators for artificial respiration; Respirators for filtering air for medical purposes; Medical apparatus and instruments for monitoring blood oxygen saturation, blood gas concentrations, vital signs and respiratory events; Medical apparatus and instruments for monitoring blood oxygen saturation, blood gas concentrations, vital signs and respiratory events, and downloadable software for recording, processing and transmitting medical data, for use therewith, sold as a unit; Medical apparatus and instruments for monitoring blood oxygen saturation, blood gas concentrations, vital signs and respiratory events, and recorded software for recording, processing and transmitting medical data, for use therewith, sold as a unit; Medical apparatus, namely, continuous positive airway pressure (CPAP) devices; Medical devices for monitoring blood oxygen saturation, blood gas concentrations, vital signs and respiratory events; Medical devices for monitoring blood oxygen saturation, blood gas concentrations, vital signs and respiratory events, and downloadable software for recording, processing and transmitting medical data, for use therewith, sold as a unit; Oxygen nasal cannula clamps for securing medical tubing; Patient breathing system comprising a breathing circuit, connections to patient, ventilator, scavenger, fresh gas delivery circuit and carbon dioxide absorber; Pillows adapted for use with continuous positive airway pressure (CPAP) devices; Tubing for use with cannulas