Hirata Akira, Yonemura Naoko, Hasumura Tadashi, Murata Yasuhiro, Negi Akira, Tanihara Hidenobu
Department of Ophthalmology, Kumamoto University School of Medicine, Kumamoto 860-0811, Japan.
Retina. 2003 Oct;23(5):682-5. doi: 10.1097/00006982-200310000-00013.
Postoperative visual field defects are sometimes found after macular hole surgery. We have previously shown that damage to the retina by air infusion from an infusion cannula is a causative factor. To minimize such damage, we modified the infusion cannula and examined its effects experimentally.
An infusion cannula with a closed tip and openings on four sides was created. Experimentally, a vitrectomy was performed in rabbit eyes using this new infusion cannula or a conventional cannula. After fluid-air exchange at an air pressure of 40 mmHg, eyes were removed and processed for histologic examination. The areas of the retinal damage caused by air infusion were evaluated.
The area of retinal damage created by the new cannula was reduced significantly when compared with damage from conventional cannula use.
This new cannula, designed for the purpose of scattering the air infusion, can reduce retinal damage, which leads to less frequent postoperative visual field defects.
黄斑裂孔手术后有时会发现术后视野缺损。我们之前已经表明，输液套管注入空气对视网膜造成的损伤是一个致病因素。为了尽量减少这种损伤，我们对输液套管进行了改进，并通过实验研究了其效果。
制作了一种尖端封闭且四周有开口的输液套管。通过实验，使用这种新型输液套管或传统套管对兔眼进行玻璃体切除术。在40 mmHg的气压下进行液气交换后，取出眼球并进行组织学检查。评估空气注入导致的视网膜损伤面积。
与使用传统套管造成的损伤相比，新型套管造成的视网膜损伤面积显著减小。
这种为分散空气注入而设计的新型套管可减少视网膜损伤，从而降低术后视野缺损的发生率。
