Sunderland Eye Infirmary, Sunderland, United Kingdom and Bioscience Institute, Newcastle University, Newcastle Upon Tyne, United Kingdom.
Charles Centro Oftalmológico, Buenos Aires, Argentina.
Retina. 2022 Nov 1;42(11):2150-2158. doi: 10.1097/IAE.0000000000003573. Epub 2022 Jul 21.
To assess flow rates, nearfield effects, and traction of a dual-cutting 20,000 cpm vitrectomy probe (HYPERVIT, Alcon) versus a single-cutting 10,000 cpm probe (Advanced ULTRAVIT, Alcon).
Flow rates were evaluated for 25+ and 27+ gauge probes using balanced salt solution or porcine cadaver vitreous (biased open, 50/50, and biased closed duty cycles). Probes were suspended in an open beaker, and flow rates were calculated using a precision balance. Nearfield effects and flow pulsatility were assessed using a validated simulation model based on experimental microparticle image velocimetry. Traction was assessed by attaching vitreous to a cantilever beam and measuring the deflection of the beam.
For HYPERVIT probes, aqueous flow rates were similar across all cutting rates. Vitreous flow rates increased with increasing cutting rates. At maximum cutting rates, aqueous flow was 62%-67% greater (25+) and 63% greater (27+) with HYPERVIT versus Advanced ULTRAVIT ( P < 0.05); vitreous flow was 44%-47% greater (25+) and 26%-32% greater (27+) with HYPERVIT versus Advanced ULTRAVIT ( P < 0.05). Nearfield effects were reduced, and peak traction forces were significantly lower for HYPERVIT versus Advanced ULTRAVIT ( P < 0.05).
Significantly greater aspiration flow, reduced nearfield effects, and reduced traction were observed with dual-action versus single-action probes.
评估 20000 cpm 双切式和 10000 cpm 单切式玻璃体切割探针（HypERVIT，Alcon）的流速、近场效应和牵拉力。
使用平衡盐溶液或猪尸玻璃体（偏置开、50/50 和偏置闭工作周期）评估 25+ 和 27+ 规探针的流速。探针悬挂在开放烧杯中，使用精密天平计算流速。使用基于实验微粒子图像测速法的验证模拟模型评估近场效应和流量脉动。通过将玻璃体附着在悬臂梁上并测量梁的挠度来评估牵拉力。
对于 HypERVIT 探针，在所有切割速度下，水性流速相似。玻璃体流速随切割速度的增加而增加。在最大切割速度下，HypERVIT 的水性流速比 Advanced ULTRAVIT 高 62%-67%（25+）和 63%（27+）（P<0.05）；玻璃体流速比 Advanced ULTRAVIT 高 44%-47%（25+）和 26%-32%（27+）（P<0.05）。与 Advanced ULTRAVIT 相比，HypERVIT 的近场效应降低，峰值牵引力显著降低（P<0.05）。
与单作用探针相比，双作用探针观察到的抽吸流速显著增加、近场效应降低和牵引力降低。
