Cervical dilator is a kind of expanding rod, which has a curved uterus shape and bends forward and forward. It is generally used to dilate the cervix from No.3 and a half to No.4, and then to 1 1 every half. The purpose of cervical dilatation is to enlarge the cervix, which is beneficial to uterine cavity operations, such as taking out the ring, curettage, abortion or hysteroscopy, or hysteroscopic electrotomy of endometrial polyps and so on. This kind of uterine cavity operation needs to dilate the cervix with a cervical dilator, and then dilate the cervix, which is beneficial to the operation. Just like taking something from a room, you need to open this door first, and the cervix is equivalent to this door. You can't take anything until you open it.