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Next generation dual-bore cannula for injection of vital dyes and heavy liquids during pars plana vitrectomy

Session Details

Session Title: Vitreoretinal Surgery II

Session Date/Time: Friday 18/09/2015 | 08:00-10:00

Paper Time: 09:36

Venue: Calliope

First Author: : O.Toygar TURKEY

Co Author(s): :    C. Riemann              

Abstract Details

PURPOSE:The objective of this study is to introduce a next generation dual bore cannula for microincisional vitrectomy surgery.


The SideFlō dual bore cannula with a closed tip and four vent ports on the sides was designed and manufactured as a joint venture between MedOne Surgical (Sarasota, Florida) and Christopher Riemann MD at the Cincinnati Eye Institute (Cincinnati, OH)


The cannula is designed to inject vital dyes for macular staining and perfluoro – n – octane. Injection and venting properties were assessed subjectively in vivo and venting was quantified in a plastic model eye system. 23, 25, and 27 gauge SideFlō cannulas were assessed and compared to existing axial dual bore cannula designs.


The dual bore cannula created a broad fan like egress of fluid which was perpendicular to the axial direction of the cannula and eliminated the possibility for retinal fluid jet damage. Enhanced outflow venting was clinically relevant in terms of smoother injection experience and less intraocular pressure rise when compared to previous dual bore designs. Testing in a model eye system confirmed marked improvement in passive outflow compared to axially injecting/single vent port dual bore cannula designs for all gauges.


The SideFlō cannula represents a novel next generation dual bore cannula design with significantly improved performance over first generation dual bore cannulas. Axial jet damage from fluid injection is eliminated and pressure equilabration through passive venting of balanced salt solution from the eye is significantly enhanced.

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