Sato Tatsuhiko, Kusaka Shunji, Oshima Yusuke, Fujikado Takashi
Department of Applied Visual Science, Osaka University Medical School, Japan.
Retina. 2008 May;28(5):749-54. doi: 10.1097/IAE.0b013e3181631907.
To investigate the cutting and aspirating properties of eight vitreous cutters under different conditions and to analyze the factors determining these properties.
Commercially available 20-gauge (20-G), 23-G, and 25-G pneumatic vitreous cutters were evaluated. The areas of the inner tube and cutting port were measured with a microscope and 3D-CAD software. The total opening area/s of the cutting port was determined by photographing the movements of the cutter blade with a high-speed camera. The total volume of balanced salt solution aspirated/s was measured.
The inner tube areas ranged from 0.350-0.352 mm2 for the 20-G, 0.169-0.196 mm for the 23-G, and 0.128-0.129 mm2 for the 25-G cutters. The port areas ranged from 0.254 to 0.306 mm2 for the 20-G, 0.122 to 0.173 mm2 for the 23-G, and 0.066 to 0.125 mm2 for the 25-G cutters. High-speed camera analyses revealed that the total opening area was determined not only by the port area but also by the duty cycle, and that the latter varied among the cutters even under the same cutting speed. There was a positive correlation (R2 >0.88) between total opening area/s and total aspirated volume/s.
Larger cutting port areas and higher duty cycles are associated with higher aspirated volumes of vitreous cutters.
研究8种玻璃体切割器在不同条件下的切割和抽吸性能，并分析决定这些性能的因素。
对市售的20号（20-G）、23-G和25-G气动玻璃体切割器进行评估。用显微镜和3D-CAD软件测量内管和切割口的面积。通过高速摄像机拍摄切割器刀片的运动来确定切割口的总开口面积。测量每秒抽吸的平衡盐溶液的总体积。
20-G切割器的内管面积范围为0.350-0.352mm²，23-G切割器为0.169-0.196mm，25-G切割器为0.128-0.129mm²。20-G切割器的端口面积范围为0.254至0.306mm²，23-G切割器为0.122至0.173mm²，25-G切割器为0.066至0.125mm²。高速摄像机分析表明，总开口面积不仅取决于端口面积，还取决于占空比，并且即使在相同的切割速度下，不同切割器的占空比也有所不同。总开口面积/秒与总抽吸体积/秒之间存在正相关（R²>0.88）。
较大的切割口面积和较高的占空比与玻璃体切割器较高的抽吸量相关。
