The sclerosing agent used in this treatment is polysilanol injection (polyoxyethylene lauryl ether), which has unique physical properties when made into foam: firstly, the vacuolation of the foam increases the surface area of contact between the sclerosing agent molecules and the vessel wall; in addition, the foam is injected into the vein in a doughnut shape, which prevents the dilution of the drug by the blood, and the therapeutic effect is significantly enhanced. Foam sclerosing agent injection into varicose veins causes endothelial damage, resulting in endothelial stripping and exposure of subendothelial collagen fibers, followed by inflammatory reaction of the vessel wall. Postoperative maintenance compression causes the vein to atrophy, with direct endothelial contact, and granulation tissue and subsequent fibrosis grows within the atrophied vein lumen, eventually forming fibrous cords to permanently occlude the vein lumen. Compared to surgical procedures, it is very less invasive, requires no anesthesia, has no skin incisions, and last night you can get out of bed and walk at the same time without hospitalization.