Described herein are nasal respiratory devices and methods for treating a variety of medical diseases including snoring and sleep apnea through the use of such devices. In general, these devices include an airflow resistor, such as a flap valve and a holdfast for securing the device in communication...http://www.google.es/patents/US7856979?utm_source=gb-gplus-sharePatente US7856979 - Nasal respiratory devices
