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First Author: G.Dushina RUSSIA
Co Author(s): V. Kumar M. Frolov E. Bozhok
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To evaluate the efficacy of a new intracanalicular device (ICD) to open Schlemms canal (SC) in cadaver eyes.
Ophthalmic unit of Skhodnya city hospital, Moscow region; Department of Ophthalmology, Peoples Friendship University of Russia, Moscow, Russian Federation.
The ICD was made from 50 micron thick medical grade soft vanadium stainless steel wire, by winding it on a specially manufactured 200 micron thick stainless steel microprobe having curvature as of SC. Technical characteristics of ICD: it is spiral, has curvature as of SC, overall length varies from 5 to 7 mm, inner lumen diameter is 200 micron, outer -300 micron. The wire loops of end parts are closely located, in the central part they are apart from each other by 0.5 to 1 mm. The ICD was implanted into SC in 5 cadaver eyes using following implantation technique: dissection of 1/2 thickness superficial (5X5 mm) and deep (3X3 mm) scleral flap upto ciliary body, deroofing of SC, dilation of 5-6 mm of SC with viscoelastic device and microprobes of varying diameters from 0.2 mm to 0.3 mm. The ICD on the microprobe was inserted into dilated SC and was held there with second instrument and microprobe was removed. The portion of the SC with ICD was cut and studied under high magnification from anterior angle side. Efficacy measures were ease of SC dilation and implantation of ICD into SC.
The SC was well dilated by alternatively injecting the viscoelastic device and with microprobes of varying diameters. After dilation the ICD could be implanted easily into SC. On examination of SC with ICD into it from the anterior angle side under high magnification, it was noticed that the device was wholly located in the canal. There was no damage to the meshwork. When inserted another microprobe into SC the device could be moved freely in the lumen of SC.
The proposed new ICD after implantation keeps the SC open. The technique of ICD implantation is simple and safe and could be easily learned.