Inclusion Criteria:  Female patients aged 18-40 years;  Meets the diagnostic criteria for moderate to severe uterine adhesions;  Has the indication for TCRA surgery and is intending to undergo TCRA surgery;  Female subjects are not breastfeeding at the time of the screening visit; ⑤ Voluntary acceptance of the treatment and has signed the informed consent form.  Exclusion Criteria:  Known allergic reactions to or contraindications for silicone rubber materials, estradiol and its metabolites, Foley balloon catheters and/or intrauterine cross-linked sodium hyaluronate gel;  Presence of contraindications for TCRA surgery;  Requires oral hormonal medications for a prolonged period of time;  Has used high-dose estrogen medication within one month prior to surgery;  Suffering from diseases such as genital tract tuberculosis, acute genital tract inflammation, pelvic inflammatory disease, abnormal uterine bleeding caused by systemic disease or malignant tumours of the genital organs; ⑥ Perimenopausal and menopausal females;  ⑦ Comorbid with severe primary diseases of the cardiovascular, cerebrovascular, hepatic, renal or hematopoietic system, or peptic ulcer disease, or severe diseases affecting patient survival (such as tumours or AIDS), or mental illness;  ⑧ Drug or alcohol dependence;  ⑨ Has enrolled in other clinical trials within the last 1 month;  ⑩ Patients with factors considered by the investigators to be unsuitable for enrollment.