Inclusion Criteria:

1. Aged ≥18 years and <75 years, regardless of sex;
2. Diagnosed with ischemic or hemorrhagic stroke, with unilateral or single-limb motor dysfunction persisting for at least 6 months;
3. The primary brain lesion and its underlying cause are clinically stable;
4. Presence of unilateral upper- or lower-limb spasticity, with a Modified Ashworth Scale (MAS) grade of ≥2 in at least two muscle groups of the affected limb;
5. Post-stroke limb dysfunction has not reached the treatment goal despite previous interventions, such as physical therapy and oral medications, and the participant's condition has shown no recent improvement;
6. The type and dose of existing rehabilitation therapy and oral antispastic medications must remain unchanged during the study;
7. Willing and able to complete all study visits and procedures;
8. Able to understand the study and provide written informed consent.

Exclusion Criteria:

1. Any contraindication to spinal cord stimulation surgery;
2. Uncontrolled refractory epilepsy;
3. Presence of tonic spasticity, such as decorticate rigidity or decerebrate rigidity;
4. Poorly controlled severe psychiatric or cognitive impairment, defined as a Beck Depression Inventory-II score >25 or a Mini-Mental State Examination score <24;
5. Active systemic infection;
6. Presence of an implanted neurostimulator or drug delivery system;
7. Botulinum toxin treatment within 4 months before enrollment;
8. Plans to initiate any new treatment during the study that may affect limb movement, including chemical denervation therapies (such as botulinum toxin), oral antispastic medications, surgical procedures (such as peripheral neurotomy or contralateral C7 nerve transfer), or other physical therapy interventions;
9. Pregnancy, breastfeeding, or planned pregnancy during the study;
10. The participant or family is unable or unwilling to participate in long-term SCS treatment management;
11. Participation in another clinical study within 4 weeks before signing informed consent;
12. Any other condition that, in the investigator's judgment, makes the individual unsuitable for participation in the study.