Risks and Benefits of Radiofrequency Ablation for Chronic Venous Insufficiency (CEAP C3-C6) in Patients Aged 80 and Over

Inclusion Criteria: 1. Age: Aged 80 years or older. 2. Clinical Diagnosis: Symptomatic chronic venous insufficiency of the lower extremity, with the highest clinical class (CEAP classification) being one of the following: * C3: Venous edema * C4a: Pigmentation or eczema * C4b: Lipodermatosclerosis or atrophie blanche * C5: Healed venous ulcer * C6: Active venous ulcer 3. Confirmed Reflux: Color duplex ultrasound examination confirming reflux (reflux time \> 0.5 seconds) in the great saphenous vein (GSV) and/or small saphenous vein (SSV) of the target limb. 4. Informed Consent: The patient or their legally authorized representative is able to understand and voluntarily provides written informed consent. Exclusion Criteria: * Participants who meet any of the following criteria will be excluded from the study: 1. Mobility: Non-ambulatory or bedridden. 2. Thrombosis: Presence of acute superficial thrombophlebitis of the target vein, or deep vein thrombosis (DVT) in the target limb. 3. Arterial Disease: Significant peripheral arterial disease, defined as an ankle-brachial index (ABI) \< 0.8 in the target limb. 4. Coagulopathy: Uncorrectable coagulation disorder. 5. Allergy: Known severe allergy to local anesthetics (e.g., lidocaine) or relevant device materials. 6. Cognition \& Compliance: Severe cognitive impairment or psychiatric illness that, in the investigator's judgment, precludes adequate understanding and cooperation for the study procedures and follow-up. 7. Life Expectancy: Life expectancy of less than 1 year due to other comorbid conditions (e.g., terminal malignancy). 8. General Unsuitability: Any other condition that, in the opinion of the investigator, makes the patient unsuitable for participation in the study.