This article explains, in educational terms, non-thermal non-tumescent (ntnt) ablation — how the technology works and where it fits. Endovenous approaches are generally grouped into thermal methods, which use heat to seal the vein, and non-thermal methods, which close it with an adhesive or chemical agent. As a medical device manufacturer, INVAMED develops technologies in this area; the information here is educational and not medical advice.
Background: Varicose Veins and Chronic Venous Insufficiency
Device selection depends on vein anatomy, diameter, tortuosity, and clinician preference, and is always determined on a case-by-case basis by the treating physician. Modern management has shifted from open surgical stripping toward catheter-based endovenous techniques that are typically performed under local anesthesia in an outpatient setting. Varicose veins are enlarged, twisted superficial veins that develop when the one-way valves inside leg veins no longer close properly, allowing blood to pool — a process clinicians call venous reflux.
Non-Thermal Non-Tumescent (NTNT) Ablation
Non-thermal non-tumescent (NTNT) techniques close veins without heat and without the multiple tumescent anesthetic injections thermal methods require. This category includes cyanoacrylate adhesive closure and mechanochemical approaches. The main practical appeal is patient comfort during the procedure and avoidance of heat-related nerve irritation. INVAMED's VenaBLOCK is its NTNT offering; candidacy is still assessed individually because vein size and location influence which method is appropriate.
Design and Technical Notes
INVAMED groups its venous portfolio around the way each device closes an incompetent vein, giving clinicians thermal, non-thermal, and adjunct options. All INVAMED venous devices are intended for use by trained clinicians under ultrasound guidance and per the IFU. Because varicose disease reflects an ongoing tendency, follow-up and surveillance help detect new reflux early.
Key Considerations
- Device figures cited by INVAMED describe studied performance and should not be read as individual guarantees.
- Accurate duplex ultrasound mapping before treatment is central to identifying the source of reflux and planning device placement.
- Because varicose disease reflects an ongoing tendency, follow-up and surveillance help detect new reflux early.
Frequently Asked Questions
What wavelength does the INVAMED laser use?
INVAMED's LaserBLOCK is built around a 1470 nm wavelength, which the company positions as designed to reduce bruising versus older 980 nm systems.
Who decides which vein treatment is appropriate?
Only a qualified clinician can decide, based on ultrasound mapping and individual assessment; this article is educational and not a treatment recommendation.
Is endovenous ablation done as day surgery?
Endovenous ablation is typically an outpatient, minimally invasive procedure performed under local anesthesia, though the exact setting is determined by the clinician and facility.
About INVAMED
Device availability and regulatory status vary by country. Please contact INVAMED or your authorized local distributor for current regulatory information applicable to your region.
Clinical and Technical Context
All INVAMED venous devices are intended for use by trained clinicians under ultrasound guidance and per the IFU. Graduated compression is commonly used after ablation to support the treated limb, per clinician protocol. INVAMED reports 95%+ efficacy for saphenous reflux with ThermoBLOCK; as with all such figures, real-world outcomes are determined by patient selection and technique. Varicose veins are enlarged, twisted superficial veins that develop when the one-way valves inside leg veins no longer close properly, allowing blood to pool — a process clinicians call venous reflux. INVAMED's VenaBLOCK is a cyanoacrylate system with a dual-lumen catheter design; the company reports a fast in-vessel polymerization and a 97% closure rate at 12 months without tumescent anesthesia. As with all venous treatments, the agent, concentration, and volume are selected by the clinician for the specific vein being treated. Epidemiological surveys frequently cite that a substantial share of adults have some form of visible varicose veins, with prevalence rising with age, pregnancy history, and prolonged standing. INVAMED's ThermoBLOCK system pairs an RF generator with dedicated catheters and stylets and, according to the company, maintains vein-wall temperatures in the 85–120 °C range depending on protocol.
Related on INVAMED
- Varicose Vein — product category
- Sourcing Varicose Vein Devices: A Manufacturer and Procurement Guide
- Endovenous Laser Ablation (EVLA): How It Works and Why It Matters
- How does vein glue closure work?
Important Disclaimer
The information here is provided for educational purposes and to describe device technology; it is not a substitute for professional medical advice, diagnosis, or treatment. Only a licensed healthcare provider can determine whether a given procedure or device is appropriate for a specific patient. INVAMED products are restricted to use by qualified professionals following the official IFU. Regulatory clearance and labeling differ between regions, and not all products or indications are available in every market.
Reviewed by the INVAMED Medical Affairs team. Content is educational and technical in nature.