An inhaler apparatus having a housing having first and second walls and defining an air inlet and an air outlet. The first and second walls define an internal housing volume and have portions being movable relative to each other so as to expand the internal housing volume from a non-inhalation state,...http://www.google.es/patents/US6098619?utm_source=gb-gplus-sharePatente US6098619 - Unit dose inhaler apparatus and method of delivery using same
Unit dose inhaler apparatus and method of delivery using same
