First Author: K.van Overdam NETHERLANDS
Co Author(s): S. Manning
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The purpose of this study was to develop intraocular diathermy forceps and test them on perfused porcine cadaver eyes.
Interventional ex vivo study in porcine cadaver eyes.
We designed two types of 23-gauge intraocular bipolar diathermy forceps by modifying commercially available membrane peeling forceps. In the first type the emitting electrode is connected to one half of the core and the return electrode to the other half, with one jaw of the forceps attached to each half. In the second type the emitting electrode is attached to the core and both jaws of the forceps, and the return electrode to the surrounding tube. We compared the new diathermy forceps to conventional intraocular diathermy, on perfused porcine cadaver eyes. First order retinal artery and vein closure was confirmed both by a perfusion study and by histology of the treated vessels.
Type 1 diathermy forceps closed retinal arteries and veins more successfully (5/5 and 5/5 successful treatments, respectively) than Type 2 diathermy forceps (5/5 and 4/5, respectively) and conventional diathermy (3/5 and 4/5, respectively). Less energy was used with Type 1 compared to Type 2 and conventional for artery closure (1.5±0.0 vs 4.6±3.3 vs 2.1±0.8 joules, respectively) and vein closure (1.5±0.0 vs 5.4±4.6 vs 2.4±0.8 joules, respectively). Histology of the treated vessels confirmed the perfusion study results.
We designed two types of a new multifunctional intraocular instrument with the ability to peel membranes and to grasp, compress and coagulate retinal blood vessels. Both types pose operational advantages compared to current conventional intraocular diathermy.