Indications for the placement of the IUD: 1) excessive menstruation and dysmenorrhea; 2) prevention of recurrence of endometrial polyps; 3) treatment of abnormal endometrial hyperplasia; 4) prevention of endometrial lesions in patients with polycystic ovaries after childbirth; 5) adenomyosis; 6) scar diverticulum of uterine caesarean section; 6) abnormal uterine bleeding to exclude endometrial malignancy; 7) contraception for women who should not take contraceptives, such as those who are obese, have diabetes, hypertension and family history of thrombosis. family history of hypertension and thrombosis, who are also at high risk of endometrial cancer, are recommended to use the Manned Ring for contraception, and contraception for patients with liver and kidney dysfunction. Each person has his or her own experience in the placement of the Manned Ring, but it is more or less the same and has its own special features. If there is a sudden increase in menstrual bleeding and abdominal pain, it is possible that the ring has shifted or fallen off and needs to be seen by a doctor. Most people will not have a period or will have a reduced amount of periods after the placement of Manuelle, but generally it does not affect the female endocrine secretion and will resume menstruation soon after removal. However, some people may have some bleeding during the first few months of placement, and there will be an adaptation process. The Manned Ring does not contain metal and does not affect the MRI. It will be checked after one month of menstruation like the regular ring and once a year afterwards.