Dry powder medicament inhalator having an inhalation-activated flow diverting means for triggering delivery of medicament

Inhaler dry powder medicament (10, 210, 310) a housing including a body (14, 214) having comprising: - a cavity for receiving a medicament cartridge (30, 252a, 322) formed inside the accommodation; - One primary inhalation passage (60, 62, 222) extending through the body (14, 214) to allow airflow through the body (14, 214); - A secondary inhalation passage (64, 90, 248, 252) extending at least partially through the body (14, 214), the secondary inhalation passage (64, 90, 248, 252) being disposed in communication receiving cavity with the medicament cartridge (30, 252a, 322); - A rotary blade (80, 240) disposed in the primary inhalation passage (60, 62, 222) such that the air passing through the primary inhalation passage (60, 62, 222) moves the vane (80 , 240) from a first position (80a, 240a) to a second position (80b, 240b); and - locking means (84, 280) selectively Toprevent airflow through the secondary inhalation passage (64, 90, 248, 252), the locking means (84, 280) diverted to a first closed position (84a ) to block airflow through the secondary inhalation passage (64, 90, 248, 252) and which are movable to a second open position (84b) to permit airflow through the secondary inhalation passage ( 64, 90, 248, 252) and disposed in communication with the rotatable vane (80, 240) so that movement of the rotatable vane (80, 240) from the first position (80a, 240a) to the second position (80b , 240b) moves the blocking means (84, 280) from the first closed position (84a) to the second open position (84b) and thereby permit airflow through the secondary inhalation passage.