From the Stein Eye Institute and Department of Ophthalmology (Aravena, Thorne, Miller), David Geffen School of Medicine, University of California Los Angeles, Los Angeles and Alcon Research Ltd. (Dyk, Fanney), Lake Forest, California, USA Dr. Aravena is now with the Departamento de Oftalmología, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile.
From the Stein Eye Institute and Department of Ophthalmology (Aravena, Thorne, Miller), David Geffen School of Medicine, University of California Los Angeles, Los Angeles and Alcon Research Ltd. (Dyk, Fanney), Lake Forest, California, USA Dr. Aravena is now with the Departamento de Oftalmología, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile.
J Cataract Refract Surg. 2018 Jul;44(7):884-888. doi: 10.1016/j.jcrs.2018.02.026. Epub 2018 Jun 21.
To evaluate aqueous volume losses associated with occlusion breaks at varying vacuum limits in phacoemulsification systems from 4 different manufacturers.
Alcon Research Ltd., Lake Forest, California, USA.
Experimental study.
The anterior chamber was modeled using the spring eye model. Systems tested included the Centurion, Whitestar Signature, Stellaris PC, and EVA. Occlusion breaks were actuated at vacuum limits of 200, 300, 400, 500, and 600 mm Hg and a target intraocular pressure of 55 mm Hg.
The model eye piston reached its measurement limit just below 600 mm Hg on the EVA and just above 400 mm Hg on the Stellaris PC. Higher vacuum limits could not be tested on these 2 units. Surge volumes varied from 17 to 77 μL on the Centurion, 30 to 103 μL on the Whitestar Signature, 67 μL to 163 μL on the Stellaris PC, and 47 to 165 μL on the EVA. Assuming an average phakic eye aqueous volume of 250 μL, these μL values correspond to percent aqueous volume losses of 7% to 31% on the Centurion, 12% to 41% on the Whitestar Signature, 27% to 65% on the Stellaris PC, and 19% to 66% on the EVA. Surge responses increased on all machines with each increment in vacuum limit. The Centurion had the lowest surge volumes across all vacuum limits.
Occlusion break surge volumes vary considerably across phacoemulsification platforms. Severe chamber shallowing might occur if an occlusion break occurs under high vacuum on some systems.
评估在四个不同制造商的超声乳化系统中，不同真空限制下的封堵破裂导致的水体积损失。
美国加利福尼亚州森林湖市爱尔康研究有限公司。
实验研究。
使用弹簧眼模型模拟前房。测试系统包括 Centurion、Whitestar Signature、Stellaris PC 和 EVA。在 200、300、400、500 和 600mmHg 的真空限制和 55mmHg 的目标眼内压下进行封堵破裂。
EVA 上的模型眼活塞在 600mmHg 以下，Stellaris PC 上在 400mmHg 以上达到其测量极限。无法在这两个单元上测试更高的真空限制。Centurion 的涌浪体积为 17 至 77μL，Whitestar Signature 的涌浪体积为 30 至 103μL，Stellaris PC 的涌浪体积为 67μL 至 163μL，EVA 的涌浪体积为 47μL 至 165μL。假设平均有晶状体眼房水体积为 250μL，这些μL 值对应于 Centurion 上的 7%至 31%、Whitestar Signature 上的 12%至 41%、Stellaris PC 上的 27%至 65%和 EVA 上的 19%至 66%的房水体积损失。随着真空限制的每次增加，所有机器的涌浪响应都会增加。Centurion 在所有真空限制下的涌浪体积最低。
超声乳化平台的封堵破裂涌浪体积差异很大。如果某些系统在高真空下发生封堵破裂，可能会导致严重的前房变浅。
