Metered-dose inhalers: actuators old and new.
The actuator has been the patient interface of the metered-dose inhaler for the past 50 years. The original 1956 design remains a significant influence upon today's actuators and, moreover, its distinct geometry is still recognisable on the market. The actuator has contributed to the metered-dose inhaler's success as a clinically effective and cost-effective device. This review focuses upon developments since the actuator's introduction as an integral part of the metered-dose inhaler and discusses key aspects of its design that influence lung deposition potential. The ability of the actuator to reduce unwanted oropharyngeal drug deposition, facilitate correct patient use and provide valuable patient feedback is highlighted.
Lewis
David
D
Head of HFA Programmes, Vectura Group Plc., Chippenham, UK. david.lewis@vectura.com
D016503:Drug Delivery Systems / Q000266:history* / Q000295:instrumentation; D004867:Equipment Design; D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D036501:Metered Dose Inhalers / Q000266:history*