Clinical Study on the Effect of Umbilical Cord Mesenchymal Stem Cell Exosomes on Endometrial Repair of Intrauterine Adhesions

Inclusion criteria

• (1) The subjects were able to fully understand the purpose of the screening and the trial, had sufficient understanding and compliance with the research protocol, and signed the informed consent form; (2) The subjects were aged between 20 and 38 years old; (3) The body mass index was 18-27 kg/m2; (4) The menstrual cycle was regular for at least half a year, with a duration of 27-35 days; (5) The ovarian reserve was normal, with at least 6 follicles (AFC), and the serum follicle-stimulating hormone (FSH) level on the 2nd-4th day of the menstrual cycle was between 1-10 IU/L, and other basic hormone indicators were within the normal range of clinical laboratories; (6) The serum human immunodeficiency virus (HIV) antibody, Treponema pallidum particle agglutination test (TPPA), hepatitis B surface antigen (HBsAg), and hepatitis C virus antibody (HCV-Ag) tests were negative within half a year; (7) Previous hysteroscopy diagnosis was moderate to severe intrauterine adhesions (AFS > 5 points); (8) There was a history of canceling frozen embryo transfer due to repeated B-ultrasound monitoring of thin endometrium and poor endometrial response (HRT cycle or/and late proliferative endometrium thickness < 6mm).

Exclusion criteria

• (1) Those who cannot accept the treatment and observation process as required by the trial; (2) Those with contraindications for hysteroscopic surgery; (3) Congenital uterine malformations; (4) Severe adenomyosis; (5) Uterine fibroids that may affect embryo implantation; (6) Other uterine factors judged by the researchers to be unsuitable for embryo implantation; (7) Patients with chromosomal abnormalities; (8) Patients with reproductive system tuberculosis, or those with immune system diseases (such as rheumatoid arthritis, systemic lupus erythematosus, etc.); (9) Chronic wasting or bleeding disorders; (10) Unaddressed tubal hydrosalpinx; (11) Contraindications for estrogen therapy; (12) Patients with systemic diseases， such as thrombosis， heart and lung diseases， hematological system diseases and malignant tumors， etc.