Multimodal particle size distributions emitted from HFA-134a solution pressurized metered-dose inhalers
نویسندگان
چکیده
منابع مشابه
Optimizing aerosol delivery by pressurized metered-dose inhalers.
The modern era of aerosol therapy began with the introduction of the Medihaler Epi in 1956, after a 13-year-old asthmatic told her father, an officer in the Riker company, that asthma medications should be as convenient to use as hair spray and she complained that the bulb atomizer leaked in her school bag. Since then, advances in technology have made aerosol delivery much more efficient, so th...
متن کاملPressurized metered dose inhalers and add-on devices.
Metered dose inhalers (MDIs) which have a valve holding chamber plus a mouthpiece or mask have, in recent years, markedly improved the ease, speed and reliability of aerosol therapy for reversible airflow obstruction in adults, children and infants. MDIs, effective and easily accessible when patients are away from home, are the gold standard for the treatment of reversible airflow obstruction s...
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The objective of this study was to compare the long-term safety of a fixed combination of fenoterol hydrobromide (50 microg) and ipratropium bromide (20 microg) delivered using a metered dose inhaler (MDI) formulated with a non-chlorinated propellant, hydrofluoroalkanel34a (HFA-MDI), with delivery using the conventional chlorofluorocarbon propellant (CFC-MDI, Berodual/Bronchodual). The study wa...
متن کاملParticle size study of nine metered dose inhalers, and their deposition probabilities in the airways.
This study deals with the particle size measurement of nine aerosol metered dose inhalers. Calibration was made possible by the use of a laser particle velocimeter (aerodynamic Particle Sizer from TSI). The count median aerodynamic diameters (CMAD) show little variation, from 0.63 to 0.73 micron, with standard deviations (sigma g) between 1.2 and 1.8. Aerodynamic diameter aerosol diagram analys...
متن کاملTuning Aerosol Particle Size Distribution of Metered Dose Inhalers Using Cosolvents and Surfactants
OBJECTIVES The purpose of these studies was to understand the influence of cosolvent and surfactant contributions to particle size distributions emitted from solution metered dose inhalers (pMDIs) based on the propellant HFA 227. METHODS Two sets of formulations were prepared: (a) pMDIs-HFA 227 containing cosolvent (5-15% w/w ethanol) with constant surfactant (pluronic) concentration and (b) ...
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ژورنال
عنوان ژورنال: AAPS PharmSciTech
سال: 2003
ISSN: 1530-9932
DOI: 10.1208/pt040338