Session Title: Vitreoretinal Surgery III
Session Date/Time: Friday 18/09/2015 | 14:30-16:00
Paper Time: 15:50
First Author: : D.Abulon UNITED STATES
Co Author(s): : R. Dimalanta S. Chen
PURPOSE:During combined vitreoretinal and phacoemulsification surgery, efficiency can be defined as the ability of the instrument to perform a task (eg, aspirate fluid) with minimal waste of effort. The purpose of this study is to evaluate the efficiency of two surgical platforms by measuring and comparing each system’s vitrectomy probe and phacoemulsification hand piece vacuum response.
Six 23-gauge vitrectomy probes and six phacoemulsification hand pieces were evaluated using the CONSTELLATION® Vision System (CVS) and Stellaris PC® (SPC). Each hand piece was connected to a sealed acrylic test chamber. Steady state pressures and rise times were recorded using a pressure transducer attached to the test chamber, power source, and oscilloscope. Vitrectomy probes were tested using 30 mm Hg infusion pressure, 5000 cuts per minute cut rate, 450 mm Hg vacuum, and activated IOP control. The aspiration vacuum for phacoemulsification hand pieces was set to 450 mm Hg. Average steady state and rise time ± standard deviations were reported and Student’s t-tests were performed.
The 23-gauge CVS vitrectomy probes achieved statistically significantly higher steady state pressures than SPC probes (26.9±2.3 mm Hg, 8.7±2.9 mm Hg, respectively; p less than 0.05). The CVS vitrectomy probes also had a shorter rise time than SPC probes (773.8±185.7 ms, 834.3±152.8ms, respectively); however, results were not statistically significantly different (p greater than 0.05). For occluded phacoemulsification hand piece tests, the CVS and SPC steady state vacuum levels were similar (438.3±4.5 mm Hg, 446.9±1.2, respectively). The steady state differences were statistically different (p less than 0.05); however, the differences were within the pressure transducer measurement error. The CVS phacoemulsification rise time was statistically significantly shorter than SPC (333.0±167.3 ms, 590.8±189.7 ms, respectively; p less than 0.05).
The CVS vitrectomy probes achieved higher steady state pressure levels and shorter rise times than SPC. The CVS phacoemulsification hand pieces generated shorter rise times and similar steady state vacuum levels compared to SPC. The CVS vitrectomy and phacoemulsification instruments may generate a more efficient vacuum response for combined surgical procedures.