The term<unk>  is often used to refer to any tube-like MDI add-on device. Some<unk> s (e.g., InspirEase) utilize a collapsing bag design to provide visual feedback that successful inspiration is taking place. Another type (e.g., Volumatic) is transparent plastic in two vase-shaped parts that come together forming a barrel shape.
Asthma spacer
Nebulizer
Allergen immunotherapy
Airway clearance therapy
Aerosol-generating procedure
Air purifier
Railway surgery
Particle therapy