Devices and methods for accurately determining the size of an ostium of a patient and in particular sinus ostium. Methods for measuring a target ostium comprise inserting the distal end portion of an ostium measuring device into a patient, locating the target ostium with the measuring device, positioning...http://www.google.co.uk/patents/US8118757?utm_source=gb-gplus-sharePatent US8118757 - Methods and devices for ostium measurement
