The IUD is an intrauterine device that is placed in a woman’s uterus. Commonly used IUDs include the memory ring, the IUD, the IUD, the T-ring, and the O-ring, each with its own advantages and disadvantages. If patients want to be more comfortable, they can use the memory ring or the IUD. 1. Memory ring: It is a “V” shaped IUD with a scientific design that follows the movement mechanics of the uterus and is less likely to shift or even fall off, making it more comfortable. In addition, the device also has the advantages of high biocompatibility and resistance to rejection; 2. 4.T-ring: made of active substance, better contraceptive effect, can be placed in the body for 8-10 years, T-ring usually leaves a tail wire, easy to check and take the ring; 5.O-ring: very small side effects, low probability of infection, placed for about 20 years, slightly higher possibility of falling off.