BCMA-CD19 CCAR T Cell Treatment of Refractory Immune Thrombocytopenia Associated with Autoimmune Diseases

Inclusion Criteria: * 1\. Age: 18\~60 years old; 2. Diagnosed with immune thrombocytopenia associated with autoimmune diseases including systemic lupus erythematosus (according to the 1997 or 2009 ACR classification criteria), primary Sjogren's syndrome (according to the 2002 ACR/EULAR international classification criteria), undifferentiated connective tissue disease (according to the 1999 international classification criteria). Or patient without clinical manifestations related to connective tissue disease, but with positive anti nuclear antibodies (≥ 1:100) and/or without positive anti SSA/Ro-52 antibodies;Serum creatinine \<221.0μmol/L (2.5mg/dl); 3. platelet count\<30 × 10 ⁹/L or platelet count ≥ 20 × 10 ⁹/L, accompanied by bleeding symptoms (bleeding symptom score ≥ 2 points). No obvious active infection; 4. Voluntary participation and informed consent signed by the patient or his/her legal/authorized representative. Exclusion Criteria: \- 1. Serious accompanying diseases that researchers consider clinically significant due to poor control, such as (but not limited to) neurological, cardiovascular, renal, liver, endocrine, or gastrointestinal diseases CNS disease: Active central nervous system (CNS) lupus (including epilepsy, psychosis, organic encephalopathy syndrome, cerebrovascular accident \[CVA\], encephalitis or CNS vasculitis), visual Disorders, cranial neuropathy requiring intervention 2. Abnormal liver function: aspartate transaminase (AST) or alanine transaminase (ALT) or glutamyl transpeptidase (GGT) detection value is greater than 1.5 times the upper limit of normal (ULN);; urinary protein quantification\>1g/24h. 3\. History of malignant tumors 4. Active hepatitis B or C.，and HIV positive 5. Individuals with a history of drug allergies or allergies. 6. Have any other clinically significant disease history or current disease that, in the judgment of the research physician, may pose a risk to the safety of the subjects, or interfere with the completion of the research procedure and the evaluation of safety and efficacy.