Magill Research Center for Vision Correction, Storm Eye Institute, Medical University of South Carolina, Charleston, South Carolina 29425, USA.
J Cataract Refract Surg. 2010 Jun;36(6):1018-23. doi: 10.1016/j.jcrs.2009.12.028.
To develop a bead-flow pattern for visualizing and comparatively quantifying fluid movement using a torsional or longitudinal ultrasound (US) phaco handpiece.
Magill Laser Center, Medical University of South Carolina, Charleston, South Carolina, USA.
Visualization and quantification of intraocular fluid dynamics were evaluated by injecting neutrally buoyant, collagen-coated polystyrene beads (diameter, 125 to 212 microm) into the phacoemulsification irrigation flow. Using the anterior chamber of a cadaver or porcine eye or a laboratory test chamber, the bead-flow pattern was video recorded. Qualitative comparisons between longitudinal and torsional phacoemulsification were made using video-processing software to track the beads frame by frame. The time (quantitative) required to aspirate a bolus of beads from the anterior chamber (clearance time) was measured and compared between the 2 modalities. Aspiration efficiency was calculated to compare operating conditions in a test chamber using high-speed videography; conditions included irrigation/aspiration (I/A) only (0% power) and clinically relevant fluidic parameters and power modulations with torsional, longitudinal, or a combination of powers applied.
Qualitative and quantitative analyses of the fluidic patterns of bead flow in the peripheral anterior chamber and near the aspirating tip opening indicated that torsional fluidics behave closer to the I/A-only configuration than longitudinal phacoemulsification, with the latter repelling more bead material in front of the aspiration tip. Bead clearance time was approximately 50% faster with torsional than with longitudinal US, regardless of the power setting.
Bead flow-pattern evaluation is a feasible approach to future studies of fluid movement in the anterior chamber.
开发一种用于可视化和比较定量分析使用扭转或纵向超声（US）白内障乳化手柄的流体运动的珠流模式。
南卡罗来纳医科大学 Magill 激光中心，查尔斯顿，南卡罗来纳州，美国。
通过将中性浮力、胶原蛋白涂层的聚苯乙烯珠（直径 125 至 212 微米）注入白内障乳化冲洗流中，评估眼内流体动力学的可视化和定量。使用尸体或猪眼的前房或实验室测试室，将珠流模式进行视频记录。使用视频处理软件对纵向和扭转白内障乳化进行定性比较，以逐帧跟踪珠粒。测量并比较两种模式从前房抽吸珠粒团所需的时间（定量），即清除时间。使用高速录像术比较测试室中的操作条件，计算抽吸效率；条件包括仅冲洗/抽吸（I/A）（0%功率）和临床相关的流体参数以及扭转、纵向或组合功率的功率调制。
对周边前房和抽吸尖端开口附近珠流的流体模式进行定性和定量分析表明，扭转流型的行为更接近 I/A 仅配置，而纵向白内障乳化术则将更多的珠粒材料排斥在抽吸尖端前面。无论功率设置如何，扭转超声的珠粒清除时间都比纵向超声快约 50%。
珠流模式评估是研究前房内流体运动的未来可行方法。
