Session Title: Vitreoretinal Surgery III
Session Date/Time: Friday 18/09/2015 | 14:30-16:00
Paper Time: 15:42
First Author: : D.Abulon UNITED STATES
Co Author(s): : T. Wang M. Charles
PURPOSE:To evaluate the effect of cut rate on vitreous traction forces of 25+ gauge dual pneumatic high speed cutters.
Traction exerted on vitreous by a vitrectomy cutter was measured in an ex-situ force measurement system using freshly harvested porcine vitreous. To minimize variability, traction was measured with the same vitreous mass by alternating between three cut rates (2500cpm, 5000cpm, and 7500cpm) and maintaining the same aspiration level (600mmHg), under the 50/50 duty cycle. A total of 10 UltraVit® 25+ gauge vitrectomy probes and 30 porcine eyes were tested. Average peak traction forces for each test were reported. Significant differences in traction forces between cut rates were determined using a paired t-test and analysis of variance with a p less than 0.05 statistical significance level.
The 2500cpm cut rate generated the greatest vitreous traction with an average peak force of 1.76±0.38mN. The 5000cpm cut rate created less traction than 2500cpm with an average peak force of 0.16±0.24mN and 7500cpm generated the least traction among the three with an average peak force of 0.87±0.19mN. Peak traction forces of 7500cpm were statistically significantly lower than 5000cpm (-0.29mN, p less than 0.0001; -0.07mN, p less than 0.001), and 2500cpm (-0.88mN, p less than 0.0001; -0.18mN, p less than 0.0001). Pure vitreous flow tests revealed similar vitreous flow with 7500cpm (1.91±0.27cc/min), 5000cpm (1.82±0.40cc/min), and 2500cpm (1.81±0.50cc/min) under the 50/50 duty cycle test condition.
Dual pneumatic high speed 25+vitrectomy probes operating at 7500cpm may improve vitrectomy surgery outcomes by generating less vitreous traction while maintaining efficient vitreous removal.