自1990年起，对38条静脉病变的下肢，通过静脉向近侧插管，将导管置于每对瓣膜下方注入造影剂，观察屏气时造影剂的泄漏量和程度。结果证明，本检测方法能清晰显示下腔静脉和髂静脉，更能定位检测深静脉中各对瓣膜的功能，从而为探讨发病机理、明确诊断和手术方法选择，提供可靠的依据。 Since 1990, 38 venous lower extremities were cannulated proximally through the veins, catheters were placed under each valve to inject contrast media, and the amount and extent of contrast medium leakage during breath holding was observed. The results show that the detection method can clearly show the inferior vena cava and the iliac vein, and more able to locate and detect the function of each valve in the deep vein, so as to provide a reliable basis for exploring the pathogenesis, diagnosing and selecting surgical methods.