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  • Devices intended to be used with nebulizers or metered-dose inhalers (MDIs) for the purpose of minimizing the delivery of large aerosolized particles, thereby increasing the percentage of inhaled medication that reaches the lower airways. Inhalation spacers typically consist of a tube-shaped reservoir that connects to the outlet of the nebulizer/MDI at its distal end and to the patient\'s mouth at the proximal end. Some inhalation spacers, termed valved holding chambers, incorporate a one-way valve that aids in regulating inspiratory flow and prevents patients from exhaling into the device.
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