The purpose of this clinical trial is to evaluate the safety and efficacy of the estradiol-loaded silicone rubber intrauterine stent system for promoting endometrial repair after artificial abortion. The main research questions it aims to answer are:
1. Can the estradiol-loaded silicone rubber intrauterine stent system increase the endometrial thickness at 21+2 days after the procedure?
2. What adverse events or safety issues occur in participants when using this product? Researchers will compare the estradiol-loaded silicone rubber intrauterine stent system with a non-drug-loaded silicone intrauterine stent to determine whether the drug-eluting stent offers advantages in promoting endometrial repair.
Participants will:
1. Undergo placement of either the estradiol-eluting stent or the non-drug stent immediately after artificial abortion, with the stent retained for 21+2 days
2. Attend scheduled follow-up visits at 21+2 days, after the first menstruation, and at 90 days post-procedure.
3. Undergo ultrasound examinations to measure endometrial thickness, and record vaginal bleeding duration, blood loss volume, time to first menstruation, and any adverse events