Dosages of inhaled insulin are controlled within a narrow range by controlling the total volume of air inhaled by a patient. By repeatedly delivering aerosolized insulin with the same total inhaled volume of air, the amount of insulin delivered to the patient each time is consistent. A device for...http://www.google.de/patents/US6167880?utm_source=gb-gplus-sharePatent US6167880 - Inhaled insulin dosage control delivery enhanced by controlling total inhaled volume 
