Katena cannula K7-3016 (Katena Products, Inc, Denville, NJ) is a 23-gauge cannula that features an end-opening port for direct irrigation and a tapered tip for ease of entry into an undilated punctum. The 13-mm length makes it ideal to probe as well as irrigate the proximal lacrimal system. Katena cannula K7-3016 eliminates the need for punctal dilation and placement of Bowman probes to dilate the punctum and measure canalicular obstruction, respectively. The end-opening, direct irrigation design prevents misdiagnosis in the setting of canalicular stenosis.
Burnstine MA. New Lacrimal Cannula for Probing and Irrigation in the Tearing Patient. Arch Ophthalmol. 2007;125(3):419. doi:10.1001/archopht.125.3.419