AD-SVF Therapy for Refractory Endometrial Infertility

Inclusion Criteria: 1. refractory thin endometrium (endometrial thickness \< 6 mm on the day of ovulation or the day of endometrial transformation during a hormone replacement cycle) and/or moderate to severe intrauterine adhesion； 2. Inability to undergo autologous bone marrow stem cells-scaffold (BMSC) transplantation due to failed bone marrow aspiration, or lack of significant effect following the BMSC treatment; 3. with fertility intentions; 4. normal ovarian function or availability of cryopreserved embryos; 5. 18kg/m\^2 \< body mass index (BMI) \< 30kg/m\^2; Exclusion Criteria: 1. Chromosomal karyotype abnormalities in one spouse; 2. Severe endometriosis, uterine fibroids affecting the uterine cavity morphology, or uterine malformations; 3. Abnormalities in coagulation function, hepatic or renal function, or other underlying conditions deemed by the investigator to potentially impact the study's progression (uncontrolled hypertension, diabetes, autoimmune diseases, etc.); 4. Contraindications for pregnancy; 5. Contraindications for hormonal cycle therapy; 6. History of pelvic tumors; 7. Simultaneous participation in other clinical studies.