Hosaka J, Roy S, Kvernebo K, Enge I, Laerum F
Section for Experimental Radiology, National Hospital, Oslo, Norway.
Acad Radiol. 1997 Jul;4(7):513-8. doi: 10.1016/s1076-6332(97)80239-5.
The authors performed an in vitro study to evaluate a temporary venous spring filter that can extend vessels of a wide range of diameters to a slit-shaped canal.
Filters were placed in thin polyethylene tubes or in porcine inferior vena cava specimens (diameter, 10.0-16.0 mm). Physiologic saline was substituted for blood flow, and blood clots of three sizes (6 x 10, 6 x 20, and 9 x 20 mm) were funneled to the filter. Clot-trapping ability was assessed by the degree of luminal extension.
When the luminal extension was increased from 2.6r to 2.8r (where r is the original radius of the vein models), clot-trapping ability increased significantly (61.1%-87.5% in polyethylene tubes and 15.8%-77.5% in venous specimens, P < .001). When the luminal extension was increased to 3.0r, more than 90% of the clots were trapped in all tubes. After trapping the small, medium, and large clots, mean intraluminal pressure elevation was 1.0, 1.0, and 17.0 cm of saline, respectively.
Despite its simple design, the spring filter proved to be an efficient filtering device.
作者进行了一项体外研究，以评估一种可将各种直径血管扩展为狭缝状管道的临时性静脉弹簧滤器。
将滤器置于细聚乙烯管或猪下腔静脉标本（直径10.0 - 16.0毫米）中。用生理盐水替代血流，并将三种尺寸（6×10、6×20和9×20毫米）的血凝块导入滤器。通过管腔扩展程度评估血凝块捕获能力。
当管腔扩展从2.6r增加到2.8r（r为静脉模型的原始半径）时，血凝块捕获能力显著提高（聚乙烯管中为61.1% - 87.5%，静脉标本中为15.8% - 77.5%，P < .001）。当管腔扩展增加到3.0r时，所有管中超过90%的血凝块被捕获。捕获小、中、大血凝块后，平均腔内压力升高分别为1.0、1.0和17.0厘米盐水柱。
尽管设计简单，但弹簧滤器被证明是一种有效的过滤装置。
