1940nm Diode Laser EVLT Machine for Clinics – Minimally Invasive Varicose Vein Treatment | ZENI

Great Saphenous Vein (GSV) Incompetence

The great saphenous vein is the most commonly treated vein in endovenous laser ablation. The 1940nm wavelength achieves effective closure by delivering laser energy through a fiber positioned inside the vein. Published studies report 100% early occlusion in both 1940nm and 1470nm groups, but with significantly lower energy requirements and fewer complications in the 1940nm group[reference:4]. Treatment is performed under local tumescent anesthesia without surgical incisions.

Small Saphenous Vein & Tributaries

The 1940nm EVLT platform treats not only the main venous trunks but also tributaries and perforator veins. A prospective study using 1940nm laser with a 400μm fiber demonstrated complete occlusion of treated venous segments in 100% of cases at 6 months, including treatment of diverse patterns of saphenous, perforator and tributary vein reflux[reference:5]. The technique eliminates the need for phlebectomy and minimizes foam sclerotherapy, reducing procedural complexity while achieving excellent clinical and aesthetic results[reference:6].

Recurrent Varicose Veins

Patients with recurrent varicose veins after previous treatment also benefit from 1940nm EVLT. The prospective study included patients with recurrent varicose veins and atypical pelvic origin leg varicosities, achieving 100% occlusion without major complications[reference:7]. The high water absorption of 1940nm allows precise energy delivery even in previously treated areas.

Comprehensive Single-Stage Treatment

The 1940nm EVLT approach enables treatment of both venous trunks and tributaries in a single-stage procedure. This eliminates the need for separate treatment sessions for different vein segments, reducing patient visits and improving convenience. The technique has been described as a superior strategy for comprehensive varicose vein management[reference:8].

Endovenous Laser Ablation Mechanism

A thin optical fiber is inserted into the varicose vein through a small puncture, typically at the knee or ankle level. The fiber is advanced to the treatment site under ultrasound guidance. Laser energy at 1940nm is delivered through the fiber as it is slowly withdrawn, heating the vein wall and causing collagen denaturation and vessel contraction. The treated vein eventually fibroses and is absorbed by the body. Blood flow is redirected to healthy veins, relieving symptoms.

Why 1940nm: Superior Water Absorption

The 1940nm wavelength has the highest water absorption coefficient among commonly used EVLA wavelengths. Its absorption in water is 4.8 times higher than 1470nm and significantly higher than earlier wavelengths such as 808nm, 980nm and 1470nm. This translates to more focused thermal effects within the vein wall — heat is generated precisely where it is needed, with less thermal spread to surrounding tissue. The result is effective vein closure at lower energy levels, reducing the risk of complications such as ecchymosis, phlebitis and paresthesia.

Lower Energy, Fewer Complications

Clinical data demonstrates that the 1940nm laser achieves effective vein closure at significantly lower linear endovenous energy density (LEED) compared to 1470nm. In a comparative study of 277 patients, the 1940nm group required 42 J/cm versus 62 J/cm for the great saphenous vein (P < 0.001). Postoperative complications including ecchymosis, superficial thrombophlebitis, paresthesia and hematoma were more frequent in the 1470nm group. Pain scores at 6 hours were significantly lower with 1940nm (3.5 vs. 4.5, P = 0.05)[reference:9]. Recovery was also faster with 1940nm, with ecchymosis rates of approximately 2% for 1940nm versus 10–18% for 1470nm[reference:10].

Pulse duration, repetition rate, fiber specifications, aiming beam, screen size, dimensions, weight and voltage should be confirmed in the model-specific specification sheet. Industry-typical 1940nm EVLT specifications include pulse duration up to 600μs, repetition rate 1–1000Hz, 650nm aiming beam, air cooling and 220VAC power supply.

What is the difference between 1940nm and 1470nm EVLT?

The 1940nm wavelength has the highest water absorption coefficient among commonly used EVLA wavelengths — 3 times higher than 1470nm in blood and vein wall. This results in more focused thermal effects, lower thermal penetration and effective vein closure at lower energy levels. Clinical studies show 1940nm achieves comparable occlusion rates with fewer local complications and lower postoperative pain scores compared to 1470nm[reference:11].

Is the procedure painful?

The procedure is performed under local tumescent anesthesia, so patients do not feel pain during treatment. After treatment, most patients experience only mild discomfort. A prospective study reported an average pain score of 2.3 on a numeric rating scale at follow-up, indicating mild discomfort[reference:12]. Patients typically walk out of the clinic and resume daily activities immediately.

How many treatment sessions are needed?

EVLT is typically a single-stage procedure. The 1940nm platform enables treatment of both venous trunks and tributaries in one session, eliminating the need for separate treatment visits. A prospective study of 100 patients achieved 100% complete occlusion of treated venous segments at 6-month follow-up with a single-stage procedure[reference:13].

How is this different from ZENI’s other vascular lasers?

ZENI’s 980nm spider vein machine and 980+1470nm dual-wavelength machine are designed for surface vascular lesions and non-invasive treatments. This 1940nm EVLT machine is a dedicated endovenous platform for treating varicose veins from inside the vessel. It requires fiber insertion and ultrasound guidance, and is suitable for clinics offering minimally invasive vein treatment. The platforms serve different clinical needs and are not interchangeable.

What should I request with the quotation?

Ask for the model-specific specification sheet covering power configuration (8W/12W/15W), pulse duration, repetition rate, fiber specifications and compatibility, aiming beam, screen size, dimensions, weight and voltage. Confirm the complete accessory list including fibers, introducer kits and foot switch.