lower segment

Results: Common iliac artery or the lower segment of abdominal aortic artery by retroperitoneal approach were selected for access arteries.

结果：21例患者均采用腹膜外径路显露单侧髂总动脉或腹主动脉下段，行胸主动脉夹层动脉瘤腔内隔绝术，即时操作成功率100%。

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While lower segment of SVC was occluded, blood could reflux through azygos vein and hemiazygos vein to right atrium.

SVC弓下段阻塞时，血液主要经奇静脉、半奇静脉逆流入下腔静脉回心。

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Conclusion: The CT scanning is better than conventional X-ray and B-ultrasonic examination in diagnosis of the ureter stone, especially the stones in the lower segment of ureter.

结论：CT对输尿管结石的检查优于X线平片及B超，尤其是对输尿管下段小结石的显示较佳。

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According to some data of static load tests of pile in Sian region, load-transfer function of the upper and lower segment of soil surrounding the pile are defined as the bilinear soft model and hard model respectively.

通过对西安地区的许多工程试桩资料的整理、分析和研究，将摩擦型桩桩周土上部土层和下部土层的荷载传递函数分别简化为双折线硬化模型和软化模型。

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[ Results] Then success rate of calculus removed was 100% by application of fiber choledochoscope, in which one case with benign closeness at lower segment of choledoch, plastic supporting tube was placed successfully at one operation by fiber choledochoscope.

结果应用纤维胆道镜取石成功率100%，1例胆总管下段良性狭窄，经纤维胆道镜下，置放塑料支撑管一次性成功。

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