Pilot high energy into veins, then tiny bubbles is generated because of the scattering character of the diode laser. Those bubbles transmit energt to the veins wall and make the blood to coagulate at the same time. 1-2 weekes after operteion, vein cavity contracts slightly,vein wall builds up, no blood flow in the operated section, Vein cavity obstructed by the vein wall over built uo.Bultrasonic wave indicates low echo,uncompressionable differing from acute great saphenous vein herombus. The vein wall inflammation abates serveral weeks after successful oeration and the vein diameter has reduced fro several months, the majority of the veins froms segmental fibrosis and difficult to be identfied.
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