Methods, apparatus, and kits for enhancing breathing in patients suffering from chronic pulmonary obstructive disease are described. The methods and apparatus rely on increasing flow resistance to expiration in a manner which mimics “pursed lip” breathing which has been found to benefit patients...http://www.google.com/patents/US20060032497?utm_source=gb-gplus-sharePatent US20060032497 - Methods and devices for improving breathing in patients with pulmonary disease
