Not every varicose vein procedure relies on heat. Cyanoacrylate vein closure, often described by patients as "vein glue," takes a different route: a specialized medical adhesive is delivered inside a diseased vein through a thin catheter, causing the vein walls to stick together and seal shut. Because no thermal energy is applied to the tissue, the technique falls into the broader category of non-tumescent, non-thermal vein treatments, distinguishing it from laser or radiofrequency ablation. This article walks through how the procedure is typically performed, what makes the adhesive approach distinct, and where it fits among the range of options a physician might consider for superficial venous insufficiency.
What Happens Step by Step During the Procedure?
A cyanoacrylate procedure typically begins with an ultrasound evaluation to map the diseased vein and confirm it is a suitable candidate for adhesive closure. The physician then accesses the vein percutaneously, usually with a small needle stick and minimal local anesthesia at the entry site, and advances a catheter along the length of the incompetent vein under continuous ultrasound guidance. Small, controlled amounts of the cyanoacrylate adhesive are then dispensed at intervals as the catheter is withdrawn, with manual compression applied externally over each treated segment to help the vein walls adhere together. Once the full length has been treated, ultrasound is used again to confirm that blood flow through the vein has stopped.
Why Doesn't This Procedure Require Tumescent Anesthesia?
Thermal ablation methods generate heat that must be dissipated safely, which is why large volumes of tumescent fluid are infiltrated around the vein beforehand to insulate nearby nerves, skin, and soft tissue. Cyanoacrylate closure does not introduce heat into the tissue, so this extensive fluid infiltration generally is not required. Devices in this category, including INVAMED's VenaBLOCK Non-Thermal Treatment for Vein Disease & Varicose Veins, are described by the manufacturer as requiring only minimal local anesthesia, which can make the injection portion of the visit shorter and involve fewer needle sticks compared with tumescent-based alternatives.
What Design Features Help the Catheter Navigate the Vein?
One practical challenge in any endovenous procedure is guiding a catheter through a vein that may curve or branch along its course. VenaBLOCK's catheter is designed to advance through curved veins without requiring a dedicated guidewire, which is intended to simplify catheter placement during the procedure. The catheter shaft also includes an integrated 630 nm red laser used solely to help the physician visualize and track catheter position beneath the skin surface — this light is for visualization purposes and is separate from any thermal treatment mechanism, since the adhesive itself performs the closure function.
How Quickly Does the Adhesive Seal the Vein?
According to the manufacturer, the cyanoacrylate-modified polymer used in VenaBLOCK polymerizes in under 1 second after being dispensed into the vein. This rapid polymerization is intended to allow the physician to apply compression and move to the next segment relatively quickly during the procedure. Manufacturer-reported outcome data for this device describe closure rates of 97% at 12 months and 94.6% at 3 years; these are manufacturer-reported figures specific to this device, and a physician can discuss how such data may relate to an individual patient's expected outcome.
What Recovery Looks Like After Adhesive Vein Closure
Because the procedure avoids both heat and extensive tumescent fluid, manufacturer materials describe recovery for this type of non-thermal closure as approximately 1–2 days before patients resume typical daily activity, though individual recovery varies based on the number of veins treated and each patient's overall health. Patients are commonly advised to walk regularly after the procedure and may be given specific guidance on activity restrictions and compression wear by their physician. Bruising or mild tenderness along the treated vein is commonly reported in the days following the procedure, similar to other minimally invasive vein treatments. This adhesive-based approach is one of several technologies represented in the varicose vein product category at INVAMED, which also includes thermal ablation systems for physicians who determine a different technology is more appropriate for a given patient.
Is cyanoacrylate vein closure considered minimally invasive?
Yes. The procedure is performed percutaneously through a small needle access point, using ultrasound guidance rather than open surgery, and it is generally classified alongside other minimally invasive endovenous techniques such as laser and radiofrequency ablation.
Does the adhesive stay in the body permanently?
The cyanoacrylate polymer remains within the closed vein segment as part of the body's natural healing and vein remodeling process. Long-term behavior of the material and closure durability are described in manufacturer-reported data specific to each device, and a physician can explain what to expect for an individual case.
How is cyanoacrylate closure different from foam sclerotherapy?
Both are non-thermal techniques, but foam sclerotherapy uses a chemical irritant delivered as foam to damage the vein lining and promote closure over time, while cyanoacrylate closure uses an adhesive that mechanically seals the vein walls together almost immediately. A physician determines which non-thermal method, if any, is appropriate based on vein size and anatomy.
Device availability and regulatory status vary by country. Please contact INVAMED or your authorized local distributor for current regulatory information applicable to your region.