Incompetent cervix is a condition in which cervix (lower part of the uterus) opens during pregnancy, usually sometime after the 14th week, causing inevitable miscarriage. Cervix is often weak due to an injury in previous pregnancy or due to gynecological surgery, but sometimes the cause is unknown.
If you know or suspect you have an incompetent cervix, miscarriage can be prevented by surgery in early pregnancy. The operation is performed under the general anesthesia, and the cervix is sewn with a thread (so it resembles the old wallet).
The procedure is called cervical cerclage. After surgery, the patient is usually given a special remedy that prevents any premature labor that can be triggered by the operation. The thread is removed when contractions start or at the 38th week of pregnancy (if the contractions did not begin until then).