Air filters for medical ventilators; Humidifiers for medical use; Medical apparatus and instruments for monitoring blood oxygen saturation, blood gas concentrations, vital signs and respiratory events; Medical apparatus for diagnosing or treating respiratory conditions; Medical apparatus, namely, continuous positive airway pressure (CPAP) devices; Medical devices for treating sleep disorders; Medical ventilator tubing and tubing connectors; Medical ventilators; Portable medical devices used for breathing exercises, namely, portable devices used for endogenous breathing exercises and for respiratory muscle training; Respiration monitors; Respirators for artificial respiration; Respiratory masks for medical purposes; Textile headgear specially adapted for use with medical ventilator mask interfaces; Therapeutic nose clips, and mouthpieces for the prevention of snoring