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L. M. Machado, O. Magalhães, Jr., E. B. Rodrigues, M. Maia, M. E. Farah, L. Molon, D. Oliveira, K. A. R. Ismail; Comparison of 20-, 23- and 25-Gauge Cannulas Air Infusion Forces. Invest. Ophthalmol. Vis. Sci. 2010;51(13):3601.
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To evaluate and compare total force and impact pressure (force/area) of 20-, 23- and 25-gauge infusion air injection.
The present study was executed in an experimental laboratory setting. Original vitrectomy 20-, 23- and 25-gauge Alcon cannulas (Forth Worth, TX) were connected to a compressed air system with growing levels of infusion pressure (from 0 to 0.08 atm, or 0 to 60.8 mmHg). Each of the cannulas was positioned in front of a pendulum device in order to measure the force. The impact pressure (force/area) was calculated using fluid dynamics formulas.
The 20-gauge cannula showed similar force values as the 23-gauge cannula for most of the infusion pressure readings (from 0 to 0.05 atm or 0 to 38 mmHg). Both showed higher results than 25-gauge cannula. Regarding the impact pressure (force/area), 23- and 25-gauge cannulas showed highest results in the majority of the experiment (from 0.025 to 0.08 atm or 19 to 61 mmHg), owing to their smaller area of impact.
Both 23- and 25- gauge cannulas showed higher impact pressure values, compared to 20-gauge system. This could be a concern regarding air infusion toxicity during small gauge vitrectomy. Future experimental and clinical studies should corroborate these findings.
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