RecruitingDevice studyImplantable Wireless Brain-Machine Interface System for Spinal Cord Injury: Efficacy and Safety StudyThis is a prospective, open-label, multi-center, single-arm study to evaluate the efficacy and safety of an implantable wireless brain-machine interface (BMI) system in patients with spinal cord injury. Eligible participants will undergo screening after signing informed consent, followed by BMI system implantation. Follow-up visits will be conducted postoperatively to assess brain-control performance and safety.