Interventional tubal recanalization: It is mainly applied to infertility patients with interstitial tubal obstruction and narrow blockage. It mainly adopts catheter dilation, inserts catheter guidewire, and uses the propulsive and dilatory separation effect of the catheter guidewire and the impact force of contrast and anti-inflammatory drugs, etc. to unblock the fallopian tubes to the umbilical end. It is clinically proven that tubal recanalization is effective and precise in the treatment of female infertility caused by tubal obstruction, with high conception rate. (a) The efficacy and advantages of tubal interventional recanalization 1. It is painless, safe and effective without incision and general anesthesia; 2. The normal tissues can be preserved. (2) Indications for tubal intervention 1. 3-7 days after menstruation, no infection in the genitalia and pelvis; 2. bilateral or unilateral blockage of the interstitial part, narrow part, and proximal part of the abdomen of the fallopian tubes, and patients with obstruction of the fallopian tubes; 3. If the fallopian tubes are patent, too thin or twisted, catheter dilation is mainly used followed by insertion of drugs through the catheter to reach the lesion in order to reduce the degree of obstruction. (3) Contraindications for tubal intervention 1. acute or subacute inflammation or chronic inflammation of internal or external genital organs; 2. serious systemic diseases that cannot tolerate the operation; 3. during pregnancy or menstruation; 4. within 6 weeks after postpartum, miscarriage or curettage; 5. obstruction of the distal end of the tubal abdomen and umbilical end that should not be recanalized by guidewire; 6. severe occlusion of the uterine horn, recanalization of ligated tubal anastomosis The guidewire should not be used for recanalization in cases of severe occlusion of the uterine horn, reobstruction after tubal anastomosis and tuberculous tubal obstruction.