When the patient presses on the spray to release a puff of drug, the drug particles contained in the metered dose inhaler are expelled at high speed into the mouth.
In order for these particles to settle deepest in the lung, where they are really needed, it is essential to synchronize their inspiration with the release of the spray (hand-lung synchronization).
For infants and the elderly, “hand-lung” synchronization can be difficult.
Poor hand-lung synchronization or mishandling implies that the majority of the drug is deposited in the oral cavity and the trachea without going to the lung, potentially generating undesirable side effects (for inhaled corticosteroids) and significantly reducing treatment effectiveness.
The valved holding chamber allows the particles of drug to be deposited in the deep lung and limits the deposit in the mouth and throat.
Technical characteristics of a valved holding chamber
Established in the 1980s by the manufacturers of asthma treatments with metered dose inhalers, the valved holding chambers, then called “Tube spacer”, were only intended to facilitate the treatment by limiting the need for “hand-lungs » synchronization.
Initially created with large volumes (sometimes close to 1 L), small volumes became favored in the 90s due to the improvement of metered dose inhalers (much less powerful jets).
Today, expectations of valved holding chambers have gone beyond the need for synchronization.
Nowadays, valved holding chambers have gradually become very technical products allowing the selection of fine particles, helping to improve pulmonary deposition by limiting the oropharyngeal deposition of the drug, an essential criteria of choice, especially for infants and young children.
How to use a valved holding chamber ?
The proper use of a valved holding chamber is essential to ensure a good dose of treatment of respiratory diseases by aerosol-dosing.
Discover in video how to use the TipsHaler® valved holding chamber with pediatric mask OrHal®
Laboratoire OptimHal-ProtecSom® is a French designer and manufacturer of medical devices certified ISO 9001:2015 and ISO 13485:2016 including the design and manufacture of dust mite covers and medical devices.
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