During the development of a Czechoslovak silicone cannula for reconstructive surgery of the lacrimal passage-ways was elaborated the modification for the congenital obstruction. The surgical method imoles the probing and cannulation at the same time. probe with fixed cannula passed delicately through nasolacrimal duct via the upper or lower canaliculus to saccus lacrimalis. This probe overcomes the lateral part of the nose on the inspection of otorhinolaryngologist. The end of cannula was fixed by the stitch to skin near lacrimal punctum. The silicone tubing is left in situ for about three months.