Other Devices Make an Appointment Ask a Question Search Conditions Oxygen Therapy Oxygen therapy is used to normalize the oxygen level in blood during sleep, rest, activity and during acute illnesses in the hospital. There are many diseases and age ranges for which oxygen therapy may be useful. Airway Clearance Devices People with some lung conditions, such as chronic bronchitis, emphysema, mycobacterial disease and bronchiectasis often produce a large amount of mucus. If the mucus is allowed to collect in the airways, breathing may become difficult and infection may occur. Airway clearance devices help mobilize mucus from the airways. The Aerobika® and Acapella® are examples of airway clearance devices. Using the Aerobika Using the Acapella Choice (Green) Using the Acapella DM or DH Peak Flow Meter A peak flow meter is a small, easy-to-use instrument that reveals how well your lungs are working. It does this by measuring your peak expiratory flow, which tells you how fast you can blow out air after a maximum inhalation. Using a Microlife Peak Flow & FEV1 Meter Using a Piko Peak Flow Meter Using a Peak Flow Meter Using the Asma-1™ Peak Flow Meter