Principle: The painless procedure of hysterosalpingography is achieved through the innovation of surgical tools and the improvement of surgical operation methods. Indications: 1. Infertility. Those who have not been pregnant for more than one year without contraception in cohabitation, except for ovulation factor infertility and male partner semen abnormality, then perform imaging to determine the site of obstruction for further diagnosis and treatment reference. 2. Prepare for another pregnancy after ectopic pregnancy. 3. Determine the category of genital tract abnormality. Contraindications: 1, acute and subacute inflammation of the reproductive tract; 2, serious systemic diseases, such as heart, brain and lung diseases and renal insufficiency; 3, normal delivery, abortion, curettage or within 6 weeks after delivery; 4, menstruation, uterine or cervical bleeding; 5, iodine allergy; 6, fever, body temperature greater than 37, 5 degrees. 7, menopause has not yet ruled out pregnancy. Operation methods and steps: 1. Take the bladder truncated position and double-combination examination to explore the position and direction of the uterus. 2. Routinely disinfect the vulva and vagina and lay sterile pore wipes. 3.Expose the cervix with a speculum, disinfect the cervix and fornix with iodine and alcohol. 4. Iodine contrast agent is pumped into a 20 ml syringe and injected into the contrast catheter to drive out the fluid and gas inside it. 5.Put the contrast catheter against the external cervical opening and inject iodine injection slowly in the direction of the uterus, stop the injection if you feel a sudden increase in the resistance to injection or if the patient feels heat and distension in the lower abdomen. 6. Fix the contrast catheter with the metal contrast catheter base and then take the film. 7. If the uterine cavity and bilateral fallopian tubes are satisfactory, remove the imaging tools, flush the ducts and take delayed films after the patient has been out of bed for 20 minutes. 8. If the uterine cavity and bilateral fallopian tubes are not well visualized, inject iodine injection slowly again until the uterine cavity and fallopian tubes are satisfactorily visualized. During the painless hysterosalpingography operation, the patient only has a slight soreness and swelling in the lower abdomen, without the painful sensation of traditional balloon catheter hysterosalpingography. Because the operation does not enter the uterine cavity, the operation process is reduced, saving examination time and reducing the chance of uterine infection.