Jules Stein Eye Institute, Department of Ophthalmology, David Geffen School of Medicine, University of California, Los Angeles, California, USA.
Retina. 2009 Oct;29(9):1289-93. doi: 10.1097/IAE.0b013e3181acd3a9.
Vitrectomy systems are now available with 20-, 23-, and 25-gauge vitreous cutters and are designed to be used with conventional or new generation pneumatic actuation technology.
Five vitreous cutters using pneumatic actuation technology were studied. Flow rates were evaluated using porcine vitreous. A high-speed camera timed the cutting phases (open, closing, closed, and opening), and duty cycle was calculated. The cutting port surface area and internal shaft surface areas were calculated.
Increasing cut rate decreased the average open phase duration without affecting other cutting phases. The opening and closing phases of vitreous cutters using new generation pneumatic actuation technology were longer than those for other vitreous cutters. Flow rate was correlated to internal shaft surface area.
In addition to confirming the importance of duty cycle at high cut rates, this study demonstrated that the transition phases should also be considered when one is evaluating the efficiency of a vitreous cutter.
玻璃体切割系统现在有 20 、 23 和 25 规格的玻璃体切割器，旨在与传统或新一代气动驱动技术一起使用。
研究了五种使用气动驱动技术的玻璃体切割器。使用猪玻璃体评估流量率。高速摄像机定时切割阶段（打开、关闭、关闭和打开），并计算占空比。计算切割端口表面积和内部轴表面积。
增加切割速度会缩短平均开启阶段的持续时间，而不会影响其他切割阶段。使用新一代气动驱动技术的玻璃体切割器的开启和关闭阶段比其他玻璃体切割器的开启和关闭阶段更长。流量率与内部轴表面积相关。
除了确认高切割速度时占空比的重要性外，本研究还表明，在评估玻璃体切割器的效率时，还应考虑过渡阶段。
