[Clinical application of a modified trocar for the treatment of maxillary sinus pathology].

A new instrument has been developed to facilitate access into a maxillary sinus for the purpose of diagnostic endoscopy and adequate surgical sanation. The cannula of this trocar has a proximal coniform portion and a distal cylindrical part with a lateral aperture and a fixing tip. Such design ensures perfect sanation of the maxillary sinus. The instrument has three stylets one of which (non-traumatic) makes possible the approach to the canine fossa and two others (having concave edges and shaping knife-like blades) to the maxillary sinus. These two stylets are used to gently cut the anterior wall of the sinus and obtain osteo-periosteal fragments in the form of three lobes. Maxillary microsinusotomy being completed, the lobes become spontaneously apposed which leads to rapid healing and formation of a soft scar along the section line as well as to complete restoration of the anterior wall of the maxillary sinus. Cannulas of two different diameters are available that enable the instrument to be used for the treatment of adults and children.