VenaSeal is a minimally invasive procedure that uses medical-grade adhesive to permanently seal damaged veins, most commonly in the legs. It treats chronic venous insufficiency, the condition behind most varicose veins, by closing off veins whose internal valves no longer work properly. Once sealed, blood reroutes through nearby healthy veins, relieving symptoms like leg heaviness, swelling, and visible bulging veins.
How the Adhesive Works
The VenaSeal system delivers a small amount of liquid cyanoacrylate glue (the same family of adhesive used in surgical skin glues) directly into the faulty vein through a thin catheter. On contact with blood and tissue, the liquid rapidly solidifies, pressing the vein walls together and stopping blood flow through it. This immediate physical seal is the first stage. Over the following weeks and months, the body encapsulates the hardened adhesive in fibrous tissue, creating a permanent closure. The sealed vein gradually shrinks and is absorbed by surrounding tissue, much like what happens with a scar.
What Happens During the Procedure
The entire treatment takes roughly 30 to 60 minutes and is done in an office or outpatient setting. Here’s what to expect:
Your doctor uses ultrasound to map the damaged vein. After cleaning the skin, they make a single needle stick, typically near the knee, to insert a small catheter into the vein. This is the only needle required for vein access. The catheter is threaded up through the vein to the treatment area, and small amounts of adhesive are dispensed at intervals along the length of the vein. After each deposit of glue, the doctor applies brief external pressure with the ultrasound probe to hold the vein walls together while the adhesive sets. Once the full length of the vein is treated, the catheter is removed and a small bandage covers the entry point.
You’re awake the entire time. Most people feel only the initial needle stick and mild pressure during the compression steps.
Why It Differs From Heat-Based Treatments
Older techniques for closing varicose veins, like radiofrequency ablation and laser ablation, use intense heat to damage the vein wall and cause it to collapse. Because that heat can burn surrounding tissue, those procedures require tumescent anesthesia: a numbing solution injected along the entire length of the vein through multiple needle sticks, sometimes a dozen or more.
VenaSeal skips that step entirely. The adhesive works at body temperature, so there’s no thermal injury to nearby nerves or tissue, and no need for the extensive numbing injections. For patients who dread needles or have had reactions to local anesthetics, this is a meaningful practical difference. It also means less post-procedure bruising along the treatment path, since there are no injection tracks running up the leg.
Effectiveness and Long-Term Results
Clinical data consistently show that VenaSeal performs on par with radiofrequency ablation for closing the great saphenous vein, the large vein running from the ankle to the groin that is most often responsible for varicose veins. Both methods demonstrate effective closure at 12-month follow-up. Longer-term studies have confirmed that VenaSeal maintains high closure rates and patient satisfaction out to five years, establishing it as a durable treatment rather than a temporary fix.
When the treated vein stays sealed, the symptoms it caused, including aching, swelling, skin changes, and visible varicosities fed by that vein, typically improve or resolve. Some patients with extensive varicose veins may need additional procedures on smaller branch veins after the main trunk is closed.
Recovery and What Comes After
Most people return to normal daily activities right away. The main restriction is avoiding strenuous exercise, particularly heavy lifting and deep squats, for a few days after treatment. Walking is encouraged immediately and actually helps recovery by promoting healthy circulation.
Compression stockings are part of the aftercare protocol at many clinics. A typical recommendation is to wear compression stockings around the clock for the first week after any initial wraps are removed, then during the daytime for a period your doctor specifies. This is less demanding than what’s required after thermal ablation, where compression wear is often needed for two weeks or longer. Some VenaSeal providers allow patients to skip compression stockings altogether, though practice varies.
You’ll have one or more follow-up ultrasound appointments, usually within a week and again at a few months, to confirm the treated vein has stayed closed.
Possible Side Effects
Because VenaSeal leaves a permanent implant of synthetic adhesive inside the body, it carries a specific set of reactions that heat-based procedures don’t.
The most notable is a hypersensitivity reaction to the glue. Published data show reaction rates ranging from about 2% to 25% of patients, a wide range that reflects differences in how studies define and track the problem. In mild cases, this looks like redness, firmness, or a pulling sensation along the treated vein that appears days to weeks after the procedure and resolves on its own. In rare cases, the reaction is more significant, involving persistent inflammation or visible skin changes over the vein.
Biopsies of treated veins at one year have shown foreign body granulomas, small clusters of immune cells forming around fragments of the adhesive. This is the body’s natural response to a material it recognizes as foreign. For most patients this causes no symptoms, but in a small number it drives ongoing discomfort or visible lumps under the skin that may need further treatment.
Other potential side effects are common to all vein-closing procedures: temporary bruising, tenderness at the access site, and a small risk of blood clots. Serious complications like deep vein thrombosis are uncommon but possible, which is one reason follow-up ultrasounds are standard.
Who Is a Good Candidate
VenaSeal is designed for people with symptomatic venous insufficiency in the superficial veins of the legs, confirmed by ultrasound showing backward blood flow (reflux) in the great or small saphenous vein. If you’ve tried conservative measures like compression stockings and leg elevation without adequate relief, you’re in the typical treatment population.
People with a known allergy to cyanoacrylate adhesives (found in some consumer super glues and surgical skin adhesives) should not have this procedure. Those with active skin infections over the treatment area or acute superficial blood clots in the target vein are also generally excluded. If you have a history of severe allergic reactions to other materials, it’s worth discussing this with your provider, given the hypersensitivity rates associated with the adhesive.
Insurance and Cost Considerations
VenaSeal received FDA approval through the premarket approval pathway, the agency’s most rigorous review process for medical devices. Insurance coverage varies significantly. Many private insurers now cover the procedure when medical necessity is documented, typically requiring evidence of reflux on duplex ultrasound and a trial period of compression therapy. However, some insurers still classify VenaSeal as experimental or limit coverage to older thermal techniques. Medicare coverage policies also vary by region. Before scheduling, it’s worth having your provider’s office verify coverage with your specific plan, since out-of-pocket costs for the procedure can run several thousand dollars without insurance.