UCAR T-cell Therapy Targeting CD19/ BCMA in Patients With Relapse/ Refractory Autoimmune Diseases

Inclusion Criteria: 1. Age ≥ 18 years old (inclusive), regardless of gender. 2. Positive expression of CD19 on peripheral blood B cells confirmed by flow cytometry. 3. Adequate hepatic, renal and bone marrow function. 4. Participants with relapsed or refractory autoimmune diseases, Including SLE or SSc. Exclusion Criteria: 1. Participants with a history of severe drug allergies or allergic constitutions. 2. Presence or suspicion of uncontrolled or treatment-required fungal, bacterial, viral, or other infections. 3. Participants with insufficient cardiac function. 4. Participants with congenital immunoglobulin deficiencies. 5. History of malignancy within five years.