Higashijima Fumiaki, Hatano Makoto, Ohta Manami, Ogata Tadahiko, Yoshimoto Takuya, Ashimori Atsushige, Wakuta Makiko, Kimura Kazuhiro
Department of Ophthalmology, Yamaguchi University Graduate School of Medicine, Ube City, Yamaguchi 755-8585, Japan.
Int J Ophthalmol. 2025 Jan 18;18(1):9-14. doi: 10.18240/ijo.2025.01.02. eCollection 2025.
To measure the optimal anterior chamber pressure (ACP) for safe phacoemulsification using a new tube chamber system with internal pressure measurement function in the porcine eye.
The 20-gauge and 21-gauge straight tips with yellow and orange sleeves, respectively, were covered by a test chamber combined with a pressure sensor for measuring ACP. This was measured for 20s from 10s after starting aspiration in the linear mode using vacuum levels of 200 and 150 mm Hg with a 20-gauge tip, and 300 and 250 mm Hg with a 21-gauge tip. Using a porcine eye, a pressure sensor fixed with a 0.9 mm corneal incision measured ACP. For the posterior capsule contact assay, porcine eyes were treated as described above, and the ultrasonic needle tip was held at the height of the iris and aspirated for 30s in linear mode at a vacuum of 200 and 150 mm Hg for the 20-gauge tip, and 300 and 250 mm Hg for the 21-gauge tip. The bottle height at which the posterior capsule accidentally contacted the ultrasonic tip was recorded, and the estimated ACP was calculated.
The internal pressure of the new tube chamber system and ACP from the porcine eye closely matched proportional changes at vacuum levels of 200 and 150 mm Hg with 20-gauge tips. Similarly, proportional changes at vacuum levels of 300 and 250 mm Hg with the 21-gauge tip were nearly equal. The bottle height at which the posterior capsule contacted with the tip and estimated ACP were 57.5±12.6 cm (20.2±7.9 mm Hg) at 200 mm Hg with a 20-gauge tip, 35.0±10.0 cm (16.6±6.3 mm Hg) at 150 mm Hg with a 20-gauge tip, 47.5±12.6 cm (18.7±8.7 mm Hg) at 300 mm Hg with a 21-gauge tip, and 32.5±5.0 cm (15.7±3.5 mm Hg) at 250 mm Hg with a 21-gauge tip.
A comprehensive understanding of this chamber system's characteristics and usage can resolve anterior chamber instability caused by changing preoperative settings on the phaco machine.
使用一种具有内部压力测量功能的新型管腔系统，在猪眼中测量安全超声乳化所需的最佳前房压力（ACP）。
分别带有黄色和橙色套管的20号和21号直头，被一个结合了用于测量ACP的压力传感器的测试腔覆盖。在直线模式下，使用20号针头，分别在200和150 mmHg的真空度下，以及使用21号针头，分别在300和250 mmHg的真空度下，从开始抽吸10秒后测量20秒的ACP。使用猪眼，通过一个用0.9 mm角膜切口固定的压力传感器测量ACP。对于后囊膜接触试验，将猪眼按上述方法处理，将超声针头保持在虹膜高度，在直线模式下，使用20号针头在200和150 mmHg的真空度下抽吸30秒，使用21号针头在300和250 mmHg的真空度下抽吸30秒。记录后囊膜意外接触超声针头时的瓶高，并计算估计的ACP。
新型管腔系统的内部压力与猪眼中的ACP在使用20号针头、真空度为200和150 mmHg时的比例变化密切匹配。同样，使用21号针头、真空度为300和250 mmHg时的比例变化几乎相等。使用20号针头、在200 mmHg时后囊膜与针头接触时的瓶高及估计的ACP为57.5±12.6 cm（20.2±7.9 mmHg）；使用20号针头、在150 mmHg时为35.0±10.0 cm（16.6±6.3 mmHg）；使用21号针头、在300 mmHg时为47.5±12.6 cm（18.7±8.7 mmHg）；使用21号针头、在250 mmHg时为32.5±5.0 cm（15.7±3.5 mmHg）。
全面了解该腔室系统的特性及用法，可解决因超声乳化仪术前设置改变而导致的前房不稳定问题。
