The invention relates to a component for an inhalation device comprising a first flow channel for inhalation, a second flow channel for exhalation, a mouthpiece forming a part of the first flow channel, a filter assigned to the second flow channel and a protection element which circumferentially surrounds...http://www.google.co.uk/patents/US7647928?utm_source=gb-gplus-sharePatent US7647928 - Inhalation device and inhalation device component
