Breathing apparatus for medical purposes; Medical apparatus for the treatment of respiratory conditions; Medical apparatus, namely, an injectable oxygen delivery system comprising an oxygen device which produces nanobubbles and nanobatteries to prevent or treat eye disease; Medical apparatus, namely, respiratory equipment and monitors therefor; Medical device, namely, carbon dioxide indicators; Medical products, namely, respiratory sensors; Nebulizers for respiration therapy; Oxygen concentrators for medical applications; Oxygen concentrators for medical purposes; Oxygen inhalators for medical use, sold empty; Oxygen inhalers for medical purposes sold empty; Oxygen inhalers for medical use, sold empty; Oxygen masks for medical purposes; Oxygen masks for medical use; Oxygen monitors for medical use; Patient breathing system comprising a breathing circuit, connections to patient, ventilator, scavenger, fresh gas delivery circuit and carbon dioxide absorber; Portable medical devices used for breathing exercises, namely, portable devices used for endogenous breathing exercises and for respiratory muscle training; Respirators for filtering air for medical purposes; Respiratory masks for medical purposes; Sterile disposable oxygen humidifiers and nebulizers for respiratory therapy sold pre-filled with water