The steam method

The steam method (STEAM ablation) is an innovation in vascular surgery: an outpatient, minimally invasive technique that closes varicose veins by heating their walls in a controlled way with water vapour. The procedure is done under local anaesthesia and ultrasound guidance, takes about 30–40 minutes, requires no hospitalisation and leaves no visible scars — and normal activities can be resumed the same day.

Used since 2006, the method was awarded in 2010 by the European Venous Forum, taking first place as the best and most original varicose vein treatment method.

The steam method at a glance

• Type of procedure: minimally invasive thermal ablation, no scalpel
• Anaesthesia: local
• Duration: about 30–40 minutes
• Hospitalisation: not needed — patients go home after a few hours
• Scars: the technique leaves no scars; the risk of haematoma is practically excluded
• Indications: any type of varicose veins and chronic venous insufficiency
• Recognition: awarded in 2010 by the European Venous Forum

What is the steam method?

The steam method is a thermal ablation technique: the walls of the affected vein are heated in a controlled way with water vapour, the vein contracts and closes (is obliterated), and the body gradually resorbs it until it becomes invisible. Unlike the classic vein-stripping operation, the vein is not pulled out of the leg — it is simply taken out of circulation, and the blood automatically finds its way through the healthy veins.

The technology behind the method is remarkable: pressurised water is injected into a micro-tube with an internal diameter of only 0.1 mm, heated by electric current. The heated water leaves the tube as steam pulses at 150 °C; at the end of the tube, a catheter conducts the steam into the vein, where it enters at a temperature of about 120 °C. Inside the vein, the steam condenses back into water, and the heat released in this process is absorbed by the vein wall — which contracts and closes the vein. The entire heat transfer takes less than one second per pulse.

Who is steam ablation recommended for?

Steam treatment is excellent for eliminating any type of varicose veins, as well as for chronic venous insufficiency. The method’s strong point is its versatility: because steam is a gas, it also penetrates the winding portions of varicose veins where rigid catheters (laser or radiofrequency) cannot reach. Both the main venous trunk and the collateral veins can be treated in the same session.

The exact indication is established at the vascular surgery consultation, after the Doppler ultrasound mapping of the entire venous network. See also the other varicose vein treatment methods, for cases where a different approach fits better.

How do you prepare for the procedure?

Before the intervention, a consultation with Doppler ultrasound establishes the “map” of the veins to be treated. The doctor discusses your medical history, any allergies and the medication you take (including anticoagulants), and explains the steps of the procedure and the recommendations for the treatment day. Being an intervention under local anaesthesia, no hospitalisation and no complex special preparation are needed — you receive the exact recommendations from the doctor at the consultation.

How does the procedure work, step by step?

1. Local anaesthesia — the treatment area is numbed; you remain awake and comfortable throughout the intervention.
2. Vein puncture — the vein is punctured with a fine needle, under ultrasound guidance; no incisions are needed.
3. Catheter insertion — through the puncture needle, an extremely flexible catheter of only 1.2 mm is introduced. Its stainless-steel tip is perfectly visible on ultrasound, so the doctor controls its position precisely.
4. Steam pulses — short pulses of vapour are released through the catheter; the heat released by condensation is absorbed by the vein wall, which closes progressively as the catheter is withdrawn along the vein. The diffusion of the steam is observed on ultrasound with great precision.
5. End of the procedure — after 30–40 minutes the vein is closed along its whole course; elastic compression is applied, and you stay at the clinic only a few hours, for observation.

What do you feel during the procedure?

During the procedure, pain is non-existent or translates, at most, into a vague feeling of unease or warmth at the moment of the steam pulses. Because the heat transfer is extremely fast (under one second), the tissues around the vein do not have time to heat up significantly.

What are the advantages of the steam method?

• No pain — during the procedure, pain is non-existent or at most a vague unease
• Safety — the heat transfer happens very fast, in less than a second, under continuous ultrasound control
• Versatility — steam treats any type of varicose vein, because it reaches the winding portions where the catheter cannot penetrate
• Homogeneous heat diffusion — the use of steam guarantees uniform heating of the vein wall, without overheated spots that could cause burns
• Excellent ultrasound visibility — the catheter’s stainless-steel tip and the diffusion of the steam are observed with the greatest precision
• Reduced risk of venous thrombosis and pulmonary embolism
• Reduced risk of venous ulcer occurrence or recurrence
• No scars and no haematomas — unlike the classic operation (stripping) or laser procedures, which can cause burns
• Complete treatment in a single session — the collateral veins and the venous trunk are treated in the same sitting

What is the recovery like?

The time spent at the clinic is only a few hours, after which you can resume your usual social and professional activities — the same day or the next day, depending on the doctor’s recommendation. In the following period, the doctor will tell you exactly how long to wear the elastic compression, how much to walk (walking is beneficial after venous procedures) and when to resume intense physical effort.

The closed vein is gradually resorbed by the body over the following weeks, during which the aesthetic appearance of the leg improves visibly. The probability of varicose disease recurring after steam ablation is extremely low. An ultrasound check at an interval set by the doctor confirms the complete closure of the treated vein.

Risks and limitations

Like any medical procedure, steam ablation can be followed by transient local reactions: mild sensitivity along the treated vein, a “pulling” sensation or small bruises at the puncture site — all usually resolving spontaneously within days. Serious complications are rare, precisely thanks to the continuous ultrasound control and the fast heat transfer. The doctor discusses all the risks, related to your specific case, before the procedure.

STEAM compared with the other methods

• vs laser — both close the vein with heat, but steam spreads the heat evenly and reaches winding veins; laser can cause localised burns — see laser therapy
• vs sclerotherapy — sclerotherapy is preferred for very small veins (telangiectasias, reticular veins); STEAM for trunks and collaterals — see foam sclerotherapy
• vs stripping (classic surgery) — no vein pulling, no general anaesthesia, no scars, no haematomas, and same-day recovery instead of weeks

Frequently asked questions

Does steam treatment for varicose veins hurt?

No. The procedure is done under local anaesthesia, and pain is usually absent — at most a vague feeling of unease or warmth during the steam pulses. No significant pain appears after the procedure either.

How soon are results visible?

The treated vein closes immediately, during the procedure. Its complete resorption by the body takes a few weeks, during which the appearance of the leg improves progressively, and the feeling of heaviness and discomfort often improves from the very first days.

Is the STEAM method better than laser?

Both are effective thermal ablation methods. Steam has three advantages: it reaches winding veins, spreads the heat evenly (no risk of localised burns) and treats the trunk plus the collaterals in the same session. The right method is nevertheless chosen after the ultrasound evaluation of each case.

When can I return to work?

In most cases, usual social and professional activities can be resumed the same day or the next day. For physically demanding jobs, the doctor will recommend an interval of lighter activity.

Do I need to wear compression stockings after the procedure?

Yes, elastic compression is usually recommended for a period established by the doctor, to support the closure of the vein and reduce any discomfort. The exact duration depends on the case.

Can both legs be treated in the same session?

Depending on the extent of the disease and the doctor’s recommendation, treatment can be done in the same session or in separate sessions. The exact plan is established at the consultation, based on the ultrasound map.