This is an investigator-initiated trial to evaluate the safety and efficacy of universal allogeneic anti-CD19/BCMA CAR T-cells in With Relapse/Refractory Autoimmune Diseases.

This is an investigator-initiated trial to evaluate the safety and efficacy ofuniversal allogeneic anti-CD19/BCMA CAR T-cells in Patients With Relapse/Refractory Autoimmune Diseases.

Study intervention consists of a single infusion of universal allogeneic CART-cells administered intravenously after a lymphodepleting therapy regimen consisting of fludarabine and cyclophosphamide.

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.