目的评估静脉瓣膜外支撑环（EVS）植入术治疗原发性下肢深静脉瓣膜功能不全的疗效和应用价值。

Objective To evaluate therapeutic effect of external valve support(EVS) implantation in the treatment of primary deep venous insufficiency(PDVI).

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目的：评估静脉瓣膜外支撑环(EVS)植入术治疗原发性下肢深静脉瓣膜功能不全的疗效和应用价值。

Objective: To evaluate the therapeutic effect of external valve support (EVS) implantation in the treatment of primary deep venous insufficiency (PDVI).

youdao