A new tube chamber system for evaluation of anterior chamber pressure during phacoemulsification tested in porcine eyes.

IF 1.9 4区医学 Q2 OPHTHALMOLOGY International journal of ophthalmology Pub Date : 2025-01-18 eCollection Date: 2025-01-01 DOI:10.18240/ijo.2025.01.02

Fumiaki Higashijima, Makoto Hatano, Manami Ohta, Tadahiko Ogata, Takuya Yoshimoto, Atsushige Ashimori, Makiko Wakuta, Kazuhiro Kimura

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Abstract

Aim: 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.

Methods: 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.

Results: 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.

Conclusion: 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.

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猪眼超声乳化术中评估前房压力的新型管室系统。

目的：利用具有内压测量功能的新型猪眼管腔系统测量安全超声乳化术的最佳前房压（ACP）。方法：用带压力传感器的试验箱覆盖20规和21规直尖，分别采用黄色和橙色套筒。这是在线性模式下开始抽吸后的20s和10s内测量的，使用真空水平为200和150毫米汞柱，使用20规格的尖端，使用300和250毫米汞柱，使用21规格的尖端。使用猪眼，将压力传感器固定在0.9 mm角膜切口处测量ACP。对于后囊接触试验，猪眼按照上述方法进行处理，超声针尖保持在虹膜高度，以线性方式抽吸30秒，20号针尖的真空度为200和150毫米汞柱，21号针尖的真空度为300和250毫米汞柱。记录后囊意外接触超声尖端时的瓶高，并计算预估ACP。结果：新型管腔系统的内压与猪眼ACP在200和150 mm Hg真空水平下的比例变化非常接近。同样，在真空水平为300毫米汞柱和250毫米汞柱时，21规格尖端的比例变化几乎相等。后囊与尖端接触的瓶高和估计ACP分别为：200mm Hg时57.5±12.6 cm(20.2±7.9 mm Hg)， 20mm Hg时150mm Hg时35.0±10.0 cm(16.6±6.3 mm Hg)， 300mm Hg时47.5±12.6 cm(18.7±8.7 mm Hg)， 21规格尖端时250mm Hg时32.5±5.0 cm（15.7±3.5 mm Hg）。结论：全面了解该前房系统的特点和使用方法，可以解决由于术前设置改变导致的前房不稳定问题。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International journal of ophthalmology Medicine-Ophthalmology

CiteScore

2.50

自引率

7.10%

发文量

3141

审稿时长

4-8 weeks

期刊介绍： · International Journal of Ophthalmology-IJO (English edition) is a global ophthalmological scientific publication and a peer-reviewed open access periodical (ISSN 2222-3959 print, ISSN 2227-4898 online). This journal is sponsored by Chinese Medical Association Xi’an Branch and obtains guidance and support from WHO and ICO (International Council of Ophthalmology). It has been indexed in SCIE, PubMed, PubMed-Central, Chemical Abstracts, Scopus, EMBASE , and DOAJ. IJO JCR IF in 2017 is 1.166. IJO was established in 2008, with editorial office in Xi’an, China. It is a monthly publication. General Scientific Advisors include Prof. Hugh Taylor (President of ICO); Prof.Bruce Spivey (Immediate Past President of ICO); Prof.Mark Tso (Ex-Vice President of ICO) and Prof.Daiming Fan (Academician and Vice President, Chinese Academy of Engineering. International Scientific Advisors include Prof. Serge Resnikoff (WHO Senior Speciatist for Prevention of blindness), Prof. Chi-Chao Chan (National Eye Institute, USA) and Prof. Richard L Abbott (Ex-President of AAO/PAAO) et al. Honorary Editors-in-Chief: Prof. Li-Xin Xie(Academician of Chinese Academy of Engineering/Honorary President of Chinese Ophthalmological Society); Prof. Dennis Lam (President of APAO) and Prof. Xiao-Xin Li (Ex-President of Chinese Ophthalmological Society). Chief Editor: Prof. Xiu-Wen Hu (President of IJO Press). Editors-in-Chief: Prof. Yan-Nian Hui (Ex-Director, Eye Institute of Chinese PLA) and Prof. George Chiou (Founding chief editor of Journal of Ocular Pharmacology & Therapeutics). Associate Editors-in-Chief include: Prof. Ning-Li Wang (President Elect of APAO); Prof. Ke Yao (President of Chinese Ophthalmological Society) ; Prof.William Smiddy (Bascom Palmer Eye instituteUSA) ; Prof.Joel Schuman (President of Association of University Professors of Ophthalmology,USA); Prof.Yizhi Liu (Vice President of Chinese Ophtlalmology Society); Prof.Yu-Sheng Wang (Director of Eye Institute of Chinese PLA); Prof.Ling-Yun Cheng (Director of Ocular Pharmacology, Shiley Eye Center, USA). IJO accepts contributions in English from all over the world. It includes mainly original articles and review articles, both basic and clinical papers. Instruction is Welcome Contribution is Welcome Citation is Welcome Cooperation organization International Council of Ophthalmology(ICO), PubMed, PMC, American Academy of Ophthalmology, Asia-Pacific, Thomson Reuters, The Charlesworth Group, Crossref,Scopus,Publons, DOAJ etc.

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