The oculist often finds that a punctum which he has dilated preparatory to irrigation of the lacrimal canal has contracted during the moment he turned his back to exchange the dilator for the irrigating syringe. I have attempted to construct an instrument which will act as a combination dilator and irrigation needle, so that only one step will be involved in the irrigation of the canal. The instrument is in effect a dilator with a central channel, the distal end opening at the tip and the proximal end into an adapter for a standard 2 cc. syringe. The opening is about 0.25 mm. wide, and the tip is about 0.4 mm. over all. The narrow aperture was attained by telescoping a series of fine metal tubes within one another and then smoothing over the joints so as to impart a uniform conical surface to the dilator portion. The instrument is
Friedman B. A COMBINATION DILATOR AND IRRIGATION NEEDLE FOR THE LACRIMAL CANAL. Arch Ophthalmol. 1941;26(6):1062–1063. doi:10.1001/archopht.1941.00870180142009
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