Minimally Invasive Treatment of Primary Great Saphenous Vein (GSV) Insufficiency Using High Intensity Focused Ultrasound (HIFU)

Inclusion Criteria: 1. Candidate for venous procedure with primary GSV insufficiency involving reflux in the segment to be treated 2. CEAP-clinical classification ≥ 2 3. Physical condition allowing ambulation after the procedure. 4. Agree to comply with the Clinical investigation plan and follow-up schedule of the study 5. Targeted tissue reachable for treatment with the device - meaning between 5mm and 24mm below the skin surface. 6. Age over 22 years at the time of enrollment. 7. No acute venous thrombosis. 8. No complete or near complete deep vein post-thrombotic disease. 9. Patient has signed and understood the written informed consent. Exclusion criteria 1. Patient is pregnant 2. Known allergic reaction to anesthetics to be used. 3. Legally incapacitated or imprisoned patients 4. Patient's vein target not clearly visible on the ultrasound images (in B mode) at the inclusion visit. 5. Patient participating in another clinical trial involving an investigational drug or device. 6. Ankle-brachial index \<7 (ABI) 7. Undergoing active anticoagulant therapy within the last 6 months 8. Diameter of the treated anatomical segment below ≤ 2mm \-