DDU tester MDIsfor metered-dose inhalersvacuum
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Characteristics
- Tested parameter
- DDU
- Applications
- for metered-dose inhalers
- Other characteristics
- vacuum
Description
MDI Metered Dose Inhaler Aerosol characteristics are relatively insensitive to changes in air flow rate because the Aerosolisation and dispersion mechanisms are dependent on the force generated by the propellant, rather than the patient’s inspiratory effort. Therefore, for MDI testing the flow rate is fixed at an arbitrary value of 28.3 L/min. A vacuum pump is used to draw air through the assembled test set-up at this flow rate. However, these test conditions are not applied for DDU Testing when the Metered Dose Inhaler is intended for use with an add-on device such as a spacer or valved holding chamber (VHC).
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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.