Indications】 1.Voluntary request for termination of pregnancy within 10 weeks of gestation without contraindications. 2, due to a disease (including hereditary diseases) should not continue pregnancy. Contraindications】 1.Acute stage of various diseases. 2, genital inflammation, such as vaginitis, acute or subacute cervicitis, acute and chronic pelvic inflammatory disease, sexually transmitted diseases, etc., without treatment. 3.Persons who cannot tolerate surgery due to poor general health condition. 4.Two times before the operation, the body temperature is above 37.50C, suspend the operation. Pre-operative preparation】 1. Pre-operative consultation to relieve ideological concerns. Explain the possible abnormalities of negative pressure aspiration, and sign the informed consent form. 2, detailed medical history and contraceptive history, pay special attention to high-risk situations. For example: age ≤20 or ≥50 years old, history of repeated abortion, six months after cesarean section, lactation, genital malformation or combined pelvic tumor, uterus extremely tilted, history of uterine perforation and myomectomy, pregnancy with apparatus and medical and surgical comorbidities, etc. 3. Check the heart, lungs, measure blood pressure and body temperature. If necessary, do the corresponding auxiliary examination. 4.Physical examination, gynecological examination and urine pregnancy test. Ultrasound examination if necessary. Take vaginal secretions to check trichomonas, candida, cleanliness, if there is positive finding, it should be cured before surgery. 5.Check the blood routine, if there is any abnormality, it should be treated accordingly. 6.Empty the bladder before surgery. 【Surgical steps】 1.Operator should wear clean work clothes, hat and mask. Routinely brush hands and wear sterile cuffs and gloves, organize surgical instruments. 2. The patient should be placed in a bladder amputation position. Routinely rinse the vulva and vagina, disinfection method and order as the placement of intrauterine device. 3. Routinely spread the towel. 4.Review the position, size, tilt and flexion of the uterus and the condition of the adnexa. Change sterile gloves. 5.The vagina is dilated with a speculum, the vaginal fluid is swabbed, the cervix is exposed, and the cervix and cervical canal are disinfected with 2.5% iodine and other disinfectants such as 75% alcohol or iodophor, and the anterior or posterior lip of the cervix is clamped with a cervical forceps. 6.Probe the uterine cavity in the direction of the uterus to detect the depth and position of the uterus. 7.The uterine orifice is gently dilated with a cervical dilator in a pencil-type manner, number by number (the degree of dilatation is half to one size larger than the suction tube used). If the internal cervical opening is tight, forceful dilation should be avoided and lubricant can be added. 8.Suction tube and negative pressure selection: according to the gestational week and the size of the cervical opening, choose the appropriate number of suction tubes, negative pressure is generally around 400-500mmHg. 9, Suction: (1) Connect the suction tube with the negative pressure device prepared before surgery. Test the negative pressure. (2) Send the suction tube slowly into the uterine cavity in the direction of the uterus and withdraw a little after reaching the bottom of the uterus to look for the embryo bed. (3) Open the negative pressure to 400-500 mmHg, turn the suction tube in clockwise or anti-clockwise direction and move it up and down, when the suction reaches the site of embryo sac, the suction tube often vibrates and feels the flow of tissue to the suction tube, at the same time, there is a sense of uterine contraction and a sense of roughness of the uterine wall, fold and pinch the skin tube and take out the suction tube (be careful not to enter or leave the cervical opening with negative pressure). Then lower the negative pressure to 200-300 mmHg, continue to use the suction tube to attract 1~2 turns in the uterine cavity according to the above method, and then remove the suction tube. If the tissue is stuck in the uterine orifice, the tissue can be removed with oval forceps. 10. If necessary, use a small scraper to gently scrape the bottom of the uterus and the double corners to check if it is clean. Measure the postoperative depth of the uterine cavity. 11. Swab the vagina with gauze, remove the cervical forceps and remove the vaginal speculum. If intrauterine device is needed, the operation can be performed as usual. 12.Before the end of each operation, filter the aspirate and check whether the aspiration of embryo and chorionic tissue is complete. Measure the volume of blood and tissue material separately. 【Postoperative treatment】 1.Fill in the operation record form. 2.The patient should rest in the observation room for half to one hour, pay attention to vaginal bleeding and general condition, and leave only if there is no abnormality. 3.Please give uterine contraction drugs and antibiotics as appropriate. (1) Do not take a tub bath for two weeks or until the vaginal bleeding is cleared, but wash the vulva daily. (2) Prohibit sexual intercourse for 1 month. (3) Advise on contraceptive methods. (4) If there is any abnormalities such as heavy vaginal bleeding, fever, abdominal pain, etc., consult the doctor at any time. Generally, the patient should be followed up once a month after the operation. 1.The electric suction device for abortion must be equipped with safety valve and negative pressure reserve device, and the general electric suction device should not be used directly to prevent accidents. 2, if the negative pressure of attraction is large, the suction tube will be sucked by the uterine wall, the negative pressure should be lifted (open the ventilation hole of the suction tube, or separate the suction tube from the connected negative pressure tube). You can also use a suction device equipped with a pressure-reducing device. 3. Suction should be applied first to the implantation site of the pregnant egg to reduce bleeding. 4. In cases of pregnancy with devices, the condition of the device should be checked before the procedure. In the case of abortion, if the device is difficult to remove, further localization and diagnosis should be done. 5, the uterus tilted obvious, uterine deformity, horn pregnancy, etc. can be operated under the supervision of ultrasound. 6, abortion is not suctioned out of the chorionic embryo sac, should be sent to the pathological examination. Dynamic observation of blood and urine pregnancy test and ultrasound. Be alert to ectopic pregnancy, residual horn pregnancy and missed diagnosis of trophoblastic disease. 7. Pregnant women with high-risk pregnancy should be marked with high-risk mark on the medical record. Explain the difficulty of the procedure and the possible complications to the family and the recipient before the operation. Treat the procedure as a priority surgery and have it undertaken by an experienced physician. Difficult high-risk surgeries need to be performed in hospitals or family planning services above the district (county) level.