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Anderson Teixeira, Rodrigo A. Brantfernandes, Ramiro Ribeiro, Bruno Diniz, Alex Zhong, Mark S. Humayun; Vitreoretinal Traction of the new generation pneumatic cutters - up than 5000 CPM. Invest. Ophthalmol. Vis. Sci. 2012;53(14):2600.
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Report the vitreoretinal traction results created by new generation pneumatic cutters (up than 5000 CPM) during vitrectomy.
Fresh porcine eyes were positioned in a specially developed holder and the retinal layers were transfixed with a 0.15-mm steel wire and fixed to the load cell of a strain gauge. Nine separate cutters with pneumatic drive mechanism with different gauges (20-, 23- and 25 gauge, three of each) was introduced into the eye at a 45-degree angle and positioned at a distance of 3 and 5 mm from the retina respectively. Data from the strain gauge was acquired and the traction force computed for varying vacuum levels and cut speed parameters.
: For 20-, 23- and 25-gauge pneumatic cutters the vitreoretinal traction increased by 2.25, 2.99 and 2.33 dynes for each 100mmHg increase in vacuum (P < 0.05) respectively. The traction forces decreased by 3.25, 3.00 and 2.35 dynes for each 1000 cuts per minutes cpm increased (P < 0.05) for 20-, 23- and 25-gauge respectively. As close the cutter is from the retina higher traction is apply to the retina. Comparing the traction at 1000 cpm and 5000 cpm the traction decrease an average of 60% at 5mm and 74% at 5mm and 3 mm ( P < 0.05).
The present study demonstrates that the effects of aspiration, distance from the retina, and cut rate are stilling crucial factors in the amount of retinal traction created by new generations vitreous cutters. According to our study, all cutters tested apply less force in high cut rate (5000 cpm) comparing to low cut rates (1000 cpm).
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