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Clinical education · Endovenous care

Understanding endovenous thermal ablation.

A practical overview of EVLA and EVRF workflows, technologies and treatment principles for healthcare professionals.

Clinicians performing an ultrasound-guided assessment of a patient's lower leg in a modern vascular clinic
Two modalitiesOne minimally invasive treatment pathway

01 · EVLA

Endovenous Laser Ablation

EVLA is a catheter-based, minimally invasive treatment used to close an incompetent superficial truncal vein, commonly the great or small saphenous vein. Duplex ultrasound is used to map reflux, plan access and guide the laser fibre to the intended treatment position. Current clinical guidance supports duplex-based treatment planning and recognises endothermal ablation as an established option for suitable patients with confirmed truncal reflux.

Laser energy is then delivered during a controlled, continuous withdrawal of the fibre. The resulting thermal effect contracts and closes the vein wall, redirecting venous return through competent pathways. Treatment planning and parameters remain the responsibility of the trained clinician and applicable product IFU.

Medical illustration showing a laser fibre positioned in the great saphenous vein

How the technology works

Ultrasound guidance, tumescence and continuous laser pullback.

EVLA combines image-guided fibre placement with perivenous tumescent anaesthesia and controlled thermal energy delivery. The treatment is continuous along the planned vein segment rather than delivered as separate segmental RF cycles.

  1. 01
    Access and fibre positioning

    The target vein is accessed percutaneously under ultrasound. An introducer is positioned and the laser fibre is advanced to the clinician’s planned starting point.

  2. 02
    Ultrasound-guided tumescence

    Tumescent solution is infiltrated around the vein to support local anaesthesia, compress the vein around the fibre and create separation from adjacent tissue.

  3. 03
    Continuous laser delivery

    Laser energy is applied as the fibre is withdrawn at a controlled rate. Wavelength, power, fibre design, pullback speed and vein anatomy all influence energy distribution.

  4. 04
    Vein closure and remodelling

    Thermal interaction produces contraction and controlled injury of the vein wall. The treated segment occludes and subsequently undergoes fibrosis and gradual remodelling.

1470 nm 1940 nm 360° radial fibres 400 & 600 μm options Continuous pullback

Typical clinical workflow

From ultrasound mapping to completion.

01

Ultrasound assessment

The target vein is assessed and mapped with duplex ultrasound. Access and treatment planning are determined by the treating clinician.

02

Vein access

Under ultrasound guidance, the vein is accessed through a small puncture and an introducer is positioned.

03

Fibre positioning

A radial or bare laser fibre is advanced to the planned treatment position and checked before energy delivery.

04

Tumescent infiltration

Tumescent anaesthesia is delivered around the target vein to support patient comfort and separate the vein from surrounding tissue.

05

Laser ablation

Laser energy is delivered while the fibre is withdrawn according to the clinician’s selected protocol, closing the treated vein.

06

Post-procedure review

The access site and treated vein are reviewed. Follow-up and aftercare are determined by the treating clinic.

Evidence snapshot · EVLA

Established treatment, with outcomes shaped by technique and follow-up.

Guideline supported

A first-line endothermal option

NICE recommends endothermal ablation for suitable people with confirmed truncal reflux following duplex assessment.

Source
89.1%

Five-year pooled GSV occlusion

A 1470 nm systematic review reported pooled GSV occlusion of 93.9% at two years and 89.1% at five years across included studies.

Source
96.3%

Twelve-month pooled occlusion above 1900 nm

A review of 1920/1940 nm studies reported 96.3% pooled occlusion at 12 months, while noting protocol heterogeneity and limited long-term data.

Source

Published outcomes are population-level findings and are not product-specific. Results vary with anatomy, technique, device, protocol, outcome definition and follow-up.

Potential clinical advantages

A modern outpatient pathway.

  • Minimally invasive, image-guided treatment
  • Usually performed in an outpatient or day-procedure setting
  • Small percutaneous access site rather than a surgical incision
  • Tumescent local anaesthesia supports the treatment pathway
  • Controlled, continuous ablation along the planned vein segment
  • Designed to support a prompt return to normal activity, as advised by the treating clinician

02 · EVRF

Endovenous Radiofrequency Ablation

EVRF is a minimally invasive thermal ablation technique in which a radiofrequency catheter is positioned inside an incompetent superficial vein under ultrasound guidance. Perivenous tumescence supports local anaesthesia, compresses the target vein and helps create a thermal buffer around the treatment segment.

Controlled energy heats the vein wall in defined treatment segments. The catheter is repositioned in measured increments until the planned length has been treated, producing contraction and closure of the target vein. Patient selection, access strategy, treatment parameters and surveillance are determined by the trained clinician and the applicable device instructions for use.

Educational procedure video

See a segmental endovenous RF workflow.

This manufacturer-provided clinical overview demonstrates catheter positioning, tumescent infiltration and controlled segment-by-segment radiofrequency energy delivery.

Watch on RF Medical’s YouTube channel

Typical clinical workflow

A controlled, segment-by-segment procedure.

01

Map and access

The vein is mapped with ultrasound and accessed using an appropriate needle, guidewire and introducer.

02

Position the catheter

The RF catheter is advanced through the introducer and positioned at the planned treatment point under ultrasound guidance.

03

Deliver tumescent anaesthesia

Tumescent solution is infiltrated around the treatment segment and catheter position is reconfirmed.

04

Apply controlled RF energy

The generator delivers radiofrequency energy using the selected temperature and cycle settings.

05

Treat segment by segment

The catheter is withdrawn through the vein in controlled increments according to the device instructions and clinical protocol.

06

Confirm completion

The catheter and introducer are removed, the access site is managed and the treated vein is reviewed by ultrasound.

Evidence snapshot · EVRF

Comparable anatomical efficacy across modern thermal modalities.

93.1%

One-year pooled GSV occlusion with RFA

A 2024 meta-analysis reported one-year GSV occlusion of 93.1% for RFA and 94.2% for laser ablation across the included evidence.

Source
Similar

Thrombotic and phlebitis outcomes

The same analysis found no statistically significant difference between RFA and laser for venous thrombotic events or phlebitis.

Source
Evidence graded

Technique follows anatomy and preference

Multi-society guidance supports thermal or non-thermal ablation according to anatomy, clinician expertise and informed patient preference.

Source

Published outcomes are population-level findings and are not product-specific. Results vary with anatomy, technique, device, protocol, outcome definition and follow-up.

System and workflow benefits

Designed for procedural control.

  • Temperature-controlled radiofrequency energy delivery
  • Ultrasound-guided catheter positioning and tumescent infiltration
  • Controlled treatment delivered in defined vein segments
  • Percutaneous access rather than an open surgical incision
  • Treatment parameters selected according to the applicable protocol and IFU
  • Minimally invasive outpatient workflow

Clinical context

Evidence, safety and professional judgement.

EVLA and EVRF are established endovenous thermal techniques, but no single outcome applies to every patient, device or protocol. Duplex findings, anatomy, symptoms, comorbidities, treatment goals and the applicable IFU all inform clinical decisions.

Expected recovery considerations

What clinicians commonly monitor.

Temporary tenderness, tightness, bruising and local inflammatory symptoms can occur following thermal ablation. Return to activity, compression and follow-up ultrasound should follow the treating clinic’s protocol and patient-specific assessment.

Recognised complications

Balanced risk communication matters.

Reported complications include superficial thrombophlebitis, pigmentation, sensory disturbance, skin burn, infection, thrombus extension or DVT, and later recanalisation or recurrent reflux. Incidence varies across technologies, techniques and study designs.

Selected clinical references

  1. NICE Clinical Guideline CG168 — Varicose veins: diagnosis and managementRecommends duplex ultrasound to confirm truncal reflux and plan treatment, with endothermal ablation offered when suitable.Open source ↗
  2. 2023 SVS / AVF / AVLS Clinical Practice Guidelines, Part IIEvidence-graded recommendations covering selection of thermal and non-thermal ablation, compression, follow-up and management of complications.Open source ↗
  3. Bontinis et al. — Mid- and long-term outcomes of 1470 nm EVLASystematic review and meta-analysis of 2,125 treated truncal veins, reporting durable anatomical closure with important variation between studies.Open source ↗
  4. Setia, Schmedt & Sroka — EVLA using wavelengths above 1900 nmSystematic review of 1920/1940 nm EVLA reporting promising occlusion outcomes while highlighting heterogeneous protocols and limited long-term evidence.Open source ↗
  5. Endovenous radiofrequency ablation versus laser ablation — 2024 meta-analysisAnalysis of 29 studies comparing early and longer-term outcomes, anatomical closure and complication profiles for RFA and laser ablation.Open source ↗

Discuss the workflow

Arrange product information, training or a demonstration.

info@medisol.com.au

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Sydney, Australia

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