我们研制出一种带瞄准器的金属异物钳,经几年的临床应用,共取出71粒不同形状金属异物,现介绍如下。1　设计原理　异物能够显影于荧光屏上,在很大程度上和它的原子序数、密度以及受伤组织的解剖学结构及密度有关。经Ｘ线拍片或透视以确定异物深度、位置及形状,组织之间关系。根? We have developed a metal foreign object pliers with a sight. After several years of clinical application, 71 pieces of metal foreign bodies of different shapes have been taken out, which are described below. 1 Design Principle Foreign objects can be developed on a fluorescent screen, to a large extent related to its atomic number, density, and the anatomy and density of the injured tissue. X-ray film or perspective to determine the foreign body depth, position and shape, relationship between organizations. root?