Clinical Research Directory

Inclusion Criteria: * 1\) Age: 20-40 years old, planning to terminate pregnancy; 2) Menopause time≤ 56 days (8 weeks); 3) Ultrasound examination showed early pregnancy in utero, and the average diameter of the fetal sac was 1-3cm; 4) According to the requirements of clinical operation standards, the preoperative examination, laboratory results and surgical indicators are normal 5) The subject was conscious, had good compliance, agreed to participate in the trial, and voluntarily signed the informed consent form Exclusion Criteria: * 1\) According to the requirements of clinical practice, there are contraindications to induced abortion; 2) The number of previous induced abortions ≥2 times; 3) Diseases affecting uterine cavity morphology such as uterine malformations and uterine fibroids; 4) History of uterine surgery: such as submucosal myomectomy history, mediastinal resection history, uterine adhesion-separation history; 5) Unable to sign the informed consent; 6) Other conditions that the investigator considers inappropriate to participate in this clinical study.