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

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。

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Considering damping and complicated boundary conditions for the valve support movement, the dynamic equation of the valve vibration of engine is found.

建立发动机气门振动的运动微分方程，该模型杆端作支承运动，考虑阻尼和较复杂的边界条件。

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

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。

youdao

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

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。

youdao