Clinical Efficacy of Vagus Nerve Stimulation via the Ear in the Treatment of Lumbar Disc Herniation with Sciatica

INTERVENTION: Intervention Group (taVNS Group):Conventional rehabilitation combined with active transcutaneous auricular vagus nerve stimulation (taVNS).;Control Group (Sham Group):Conventional rehabilitation combined with sham transcutaneous auricular vagus nerve stimulation (taVNS).; CONDITION: (ICD‐10: M51.2) Lumbar disc herniation with sciatica PRIMARY OUTCOME: Visual Analogue Scale for pain; SECONDARY OUTCOME: Oswestry Disability Inde X(ODI);Japanese Orthopaedic Association (JOA) Low Back Pain Score;Short‐Form McGill Pain Questionnaire (SF‐MPQ);Surface Electromyography (sEMG);Peripheral Blood Inflammatory Cytokines;Intervention Compliance Rate;Treatment Satisfaction;Adverse Event Incidence; INCLUSION CRITERIA: 1. Diagnosed with lumbar disc herniation confirmed by MRI with typical symptoms; 2. Sciatica (lower limb radiating pain); 3. Aged 18‐75 years, either sex; 4. VAS >=4; 5. Disease duration >=4 weeks and <=12 months; 6. Voluntary participation with signed informed consent.