Flynn H W, Lee W G, Parel J M
Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami School of Medicine, FL 33136.
Graefes Arch Clin Exp Ophthalmol. 1989;227(4):304-8. doi: 10.1007/BF02169401.
A cannulated extrusion needle was designed as a modification of the standard 20-gauge extrusion by including an inner 24-gauge flexible cannula that can be extended up to 18 mm beyond the metal tip. Indications for use of the instrument are reviewed along with selected case histories demonstrating its use. The instrument is used primarily for internal subretinal fluid drainage in eyes with complex retinal detachments caused by proliferative vitreoretinopathy. The flexible cannula is guided into the subretinal space through an open peripheral retinal break and the subretinal fluid is evacuated during a simultaneous fluid/air exchange. The positive pressure of the automated air pump creates a pressure gradient sufficient to achieve passive egress of subretinal fluid through the cannula. Active suction is avoided because of the risk of posterior retinal incarceration into the cannula tip. In addition, the cannula can be used to remove hemorrhage, gas, or silicone oil in the subretinal space.
一种带套管的挤压针是对标准20号挤压针的改进，它包括一个内部24号柔性套管，该套管可延伸至金属尖端以外18毫米处。文中回顾了该器械的使用指征，并列举了一些使用该器械的病例史。该器械主要用于因增殖性玻璃体视网膜病变导致复杂视网膜脱离的眼睛的视网膜下液内引流。通过开放的周边视网膜裂孔将柔性套管引导至视网膜下间隙，并在同时进行液体/空气交换时排出视网膜下液。自动气泵的正压产生一个足以使视网膜下液通过套管被动流出的压力梯度。由于存在视网膜后部嵌顿于套管尖端的风险，应避免主动抽吸。此外，该套管可用于清除视网膜下间隙中的出血、气体或硅油。
