In the case of sclerotherapy, the chemical agent ‘aethoxysklerol’ is injected into the varicose veins. The agent causes the vein to contract and close. This therapy is suitable for larger varices, up to varicose branches with a maximum diameter of 3 millimeters.
During the foaming process, ethoxysklerol is mixed with air, generating the production of foam. This foam is also injected into the varicose veins. The method is used for thicker varices. Ultrasonic imaging is used to control how much foam is being injected into the vein.