Valved holding chambers are devices designed for use with metered-dose inhalers (MDI). Their purpose is to improve medication delivery, decrease deposition of medication in the mouth and throat, and eliminate the need to coordinate activating the MDI with inhaling the medication.

Holding chambers have valves that prevent medication loss during exhalation by allowing air to flow through the chamber only during inspiration. For children with asthma, an MDI with a holding chamber may be easier to use and more effective than an MDI alone.

AeroChamber Plus VHC is an improvement of the original AeroChamber VHC. It is designed to:

• Maximize delivery of pressurized metered-dose inhaler (pMDI) medications to patients' lungs
• Reduce patients' need for hand-breath coordination
• Reduce oral deposition

AeroChamber Plus VHC includes upgrades not found in the original AeroChamber VHC. These improvements include:

• Chamber design. AeroChamber Plus VHC delivers 22% more medication than the original AeroChamber VHC. The new design maximizes fine-particle dosage and allows aerosolized medication to be suspended in the chamber, which minimizes the need for hand-breath coordination.
• Inhalation valve. The inhalation valve is new and more durable. Designed for low resistance, it is effective with low respiratory effort.
• Exhalation valve. The exhalation valve has been refined to provide low resistance to exhaled flow.
• MDI adapter. A new polymer material has been selected for the MDI adapter to improve durability.
• Latex-free mask. The latex-free mask has been redesigned to be more comfortable and provide a better fit.

As with the original AeroChamber VHC, AeroChamber Plus VHC is available with and without a mask. The masks are available in three sizes: small, medium, and large.