Sclerotherapy or injection of varicose veins is a procedure designed to improve the appearance of your varicose veins. The veins are injected with a solution called a sclerosant which damages the internal lining of the vein and causes blood clotting within the vein. In time, your own body will then destroy the vein and it will disappear. The solution normally used for this procedure is called sodium tetradecyl sulphate (STD) and is available in different concentrations depending on the size of the vein being treated.
Normally STD is injected as a solution directly into the vein to be treated. Foam sclerotherapy involves making small volumes of the solution into foam by rapid mixing and agitation with a small volume of air. This can then be used to treat some of the larger underlying abnormal veins which would not normally be treated with conventional sclerotherapy.
This is performed under ultrasound control. The foam solution causes intense spasm of the vein and a greater volume can be injected without using too much of the STD solution.