A method of treating a patient's maxillary sinus having an obstructed or narrowed maxillary ostium. A balloon of a balloon catheter is inflated in the obstructed or narrowed maxillary ostium to enlarge the ostium. The ostium remains enlarged after the balloon catheter is removed....http://www.google.co.uk/patents/US7717933?utm_source=gb-gplus-sharePatent US7717933 - Balloon catheters and methods for treating paranasal sinuses
