Korbin C D, Reed R A, Taylor F C, Kokoris S P, Teitelbaum G P
University of Southern California School of Medicine, Los Angeles.
Cardiovasc Intervent Radiol. 1993 Jan-Feb;16(1):3-6. doi: 10.1007/BF02603028.
It has been shown recently that Vena Tech-LGM (B. Braun Vena Tech, Evanston, IL) filters inserted into the inferior vena cava via the jugular route may be deployed sometimes in an incompletely opened (IO) position. The flow characteristics and clot capturing ability of IO Vena Tech-LGM filters are not clearly understood. Using a vena cava flow phantom, the clot-capturing abilities of the IO and opened Vena Tech-LGM filters were assessed. For 5 x 5-mm clots, the IO Vena Tech-LGM filter captured only 40% of thrombi compared with a 90% capture rate for the opened filter. The capture rates were 90 and 100% for the IO and opened filter, respectively, for larger 5 x 15-mm clots. It was found that the IO filter could capture 2-7 x 25 mm thrombi prior to the development of a turbulent bypass channel which prevented subsequent clot capture. Using 5 x 15 mm clots, this same phenomenon occurred with the capture of 6 and 11 thrombi by the IO and opened Vena Tech-LGM filters, respectively. Our results suggest a significantly reduced filtering efficiency for the IO Vena Tech-LGM device. However, there is a high rate of clot capture with the opened Vena Tech-LGM filter.
最近研究表明，经颈静脉途径插入下腔静脉的Vena Tech-LGM过滤器（美国伊利诺伊州埃文斯顿市贝朗医疗公司生产）有时可能会以未完全打开（IO）的位置展开。IO型Vena Tech-LGM过滤器的血流特性和血栓捕获能力尚不清楚。利用下腔静脉血流模型，对IO型和已打开的Vena Tech-LGM过滤器的血栓捕获能力进行了评估。对于5×5毫米的血栓，IO型Vena Tech-LGM过滤器仅捕获了40%的血栓，而打开的过滤器捕获率为90%。对于更大的5×15毫米血栓，IO型和打开的过滤器的捕获率分别为90%和100%。研究发现，在湍流旁路通道形成之前，IO型过滤器可以捕获2 - 7×25毫米的血栓，而湍流旁路通道会阻止后续血栓捕获。使用5×15毫米血栓时，IO型和打开的Vena Tech-LGM过滤器分别捕获6个和11个血栓时也出现了同样的现象。我们的结果表明，IO型Vena Tech-LGM装置的过滤效率显著降低。然而，打开的Vena Tech-LGM过滤器的血栓捕获率很高。
