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Perfluorocarbon liquid manipulation of high-density intraocular foreign bodies.

机译：全氟化碳液体处理高密度眼内异物。

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BACKGROUND: Perfluorocarbon liquids (PFCLs) are useful for floating various materials off the posterior retina during vitreoretinal surgery. It is generally assumed that buoyancy forces restrict this use to objects with specific gravity lower than that of PFCLs. METHODS: We tested potential intraocular foreign body materials with specific gravities ranging from 1.1-8.7. The relative affinities of each material for saline and PFCL (specific gravity 1.94) were determined. For each material, we then tested the ability of several specimens of increasing surface/volume ratio to float at the saline-PFCL interface in a glass beaker. RESULTS: All materials with specific gravity higher than PFCL demonstrated a greater affinity for saline than for PFCL. Specimens of each of these dense materials floated at the saline-PFCL interface, provided that the surface/volume ratio of the specimen was above a critical value. The critical surface/volume ratio for each material was directly proportional to its specific gravity. CONCLUSIONS: PFCLs may be useful for manipulating a variety of intraocular foreign bodies, even those with specific gravities higher than PFCL. Surface forces, in addition to buoyancy, govern the disposition of small foreign bodies at the saline-PFCL interface.
机译：背景：全氟化碳液体（PFCL）可用于在玻璃体视网膜手术中使各种物质从视网膜后部浮出。通常假定浮力将这种使用限制在比重低于PFCL的物体上。方法：我们测试了比重范围为1.1-8.7的潜在眼内异物材料。确定每种材料对盐水和PFCL的相对亲和力（比重1.94）。对于每种材料，我们然后测试了多个表面积/体积比增加的标本在玻璃烧杯中的生理盐水-PFCL界面上漂浮的能力。结果：所有比重均高于PFCL的材料对盐水的亲和力均高于PFCL。只要样品的表面/体积比高于临界值，这些致密材料中的每种样品都会漂浮在盐水-PFCL界面处。每种材料的临界表面/体积比均与其比重成正比。结论：PFCLs对于处理各种眼内异物可能有用，即使那些比重高于PFCL的异物也是如此。除浮力外，表面力还控制着盐水-PFCL界面处小的异物的处置。

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