Mapping pain during vein surgery to make it less uncomfortable

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Age≥ 18 years old, ≤ 90 years old; 2. the patient's life expectancy is greater than 12 months; 3. The clinical diagnosis is primary VVs, CEAP classification C2-C6, and the GSV segment needs to be treated, including pain, burning sensation, heaviness, fatigue, itchy skin, night cramps and other clinical symptoms; 4. Doppler ultrasound confirmed that the diameter of GSV was greater than 3mm and less than 12mm when standing; 5. Doppler ultrasound confirms that GSV is located in the saphenofascia or the distance between GSV and the skin surface is \>1cm; 6. radiofrequency ablation treatment only for unilateral GSV walking area; 7. The patient is willing to cooperate with the completion of the examination specified in the protocol. Exclusion Criteria: 1. GSV thrombosis, or combined with deep vein thrombosis, or previous history of deep vein thrombosis and pulmonary embolism; 2. patients with recurrence after prior VVs-related surgery (C2r); 3. the GSV trunk is severely distorted, and it is expected that the catheter will not be able to pass; 4. Severe ischemia of the lower limbs, Ankle brachial pressure index (ABPI) \< 0.8; 5. Known allergy to the drugs and device materials involved in the study; 6. Previously implanted with a pacemaker or defibrillator, and currently receiving regular anticoagulation therapy (such as warfarin, heparin); 7. Pregnant or lactating females; 8. Patients who are unable or unwilling to participate in the study; 9. Participating in the research of other drugs or devices; 10. Skin malignancies other than non-melanoma that are being treated; 11. daily use of narcotic drugs or non-steroidal anti-inflammatory drugs to control pain caused by venous disease; 12. The investigator judged that endovenous treatment was not suitable;