Radiology Department, University of Massachusetts Medical School, Worcester, 01655, USA.
AJR Am J Roentgenol. 2010 Jul;195(1):242-4. doi: 10.2214/AJR.09.3472.
The purpose of this study was to compare the size of biopsy cores obtained using a biopsy needle before and after manual curving of its inner stylet.
A total of 40 open renal biopsies were randomly performed on two ex vivo beef kidneys using four different semiautomated cutting needles. Two 18-gauge and two 20-gauge needles were used; one needle of each gauge had its inner stylet manually curved. Ten biopsy specimens were obtained using each needle and then were put into four different formalin containers, one for each needle, and sent to the pathology laboratory. Two pathologists who were blinded to the corresponding needles reviewed the samples in consensus and measured the dimensions of obtained cores.
The mean diameter of the cores was larger when curved needles were used: for the 18-gauge needles, the core diameters were 0.866 mm for the curved needle and 0.688 mm for the straight needle, and for the 20-gauge needles, the core diameters were 0.522 mm for the curved needle and 0.480 mm for the straight needle. The length of the samples was also longer when they were obtained using the curved needle. When we considered the cores as cylinders, the calculated volumes of samples obtained using the curved needles were significantly larger.
Manually curving of the inner stylet of the cutting biopsy needle results in larger cores, in terms of diameter and length, and results in significantly larger overall volume.
本研究旨在比较活检针在手动弯曲其内部芯丝前后所获得的活检芯的大小。
在两个离体牛肾组织上，共随机进行了 40 例开放式肾脏活检，使用了四种不同的半自动切割针。使用了两种 18 号和两种 20 号针，每种规格的针都手动弯曲其内部芯丝。每种针使用 10 个活检样本，然后将其放入四个不同的福尔马林容器中，每个容器对应一种针，并送到病理实验室。两位病理学家对相应的针进行了盲法评估，对样本进行了共识评估，并测量了获得的芯的尺寸。
当使用弯曲的针时，芯的平均直径较大：对于 18 号针，弯曲针的芯直径为 0.866mm，直针为 0.688mm，对于 20 号针，弯曲针的芯直径为 0.522mm，直针为 0.480mm。当使用弯曲的针时，样本的长度也更长。当我们将样本视为圆柱体时，使用弯曲针获得的样本的计算体积明显更大。
手动弯曲切割活检针的内部芯丝会导致芯的直径和长度更大，从而导致整体体积显著增加。
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