The foraminoscope enters the intervertebral foramen from the side or side and back of the patient’s body (either in a flat or oblique fashion) and performs the procedure in a safe working triangle. The procedure is performed outside the disc’s fibrous annulus, and the herniated nucleus pulposus, nerve roots, dural sac and hyperplastic bone tissue can be clearly seen under direct endoscopic vision. The herniated tissue is then removed using various types of grasping forceps, the bone is removed microscopically, and the broken fibrous annulus is sealed with radiofrequency electrodes. Small trauma: the skin incision is only 7 mm, the size of a soybean, bleeding is less than 20 ml, and only 1 stitch is needed after the operation. It is the minimally invasive procedure for lumbar disc herniation with the least trauma and the best results among similar procedures. Compared with traditional open surgery, intervertebral foraminoscopy has the following advantages: 1. Small incision: tiny incision in the back, 0.5cm to 0.7cm, basically leaving no scar, known as “keyhole”. 2. 2, less bleeding: almost no bleeding during the operation. Minimally invasive surgery with clear vision, coupled with the use of bipolar radiofrequency and other advanced hemostatic devices, helps to reduce the amount of bleeding. 3.Light pain: Patients feel little pain and the surgery is done under local anesthesia, and patients finish the surgery in a waking state. 4.Fast recovery: no damage to the bone, which shortens the recovery time after surgery. 5.Short hospitalization time: you can go down to the ground the next day after surgery, and resume normal work and physical exercise in 3-6 weeks on average. 6.Not easy to recur: the success rate of surgery is about 93%, while the recurrence rate is less than 4% Suitable people include: 1. various types of lumbar disc herniation; 2. disc nucleus pulposus prolapsed or free; 3. those who failed in open surgery; 4. those with intervertebral foraminal stenosis; 5. those with discogenic back pain. Dr. Lu Fpeng of the Department of Orthopedics of Yongchuan Hospital of Chongqing Medical University took the lead in carrying out this technology in the western part of Chongqing in 2012 and has accumulated rich experience in surgery. Case presentation I: Minimally invasive treatment of L5-S1 disc herniation by trans-lateral foraminoscopy A 57-year-old male with low back pain and pain radiating to the right lower extremity for 8 years, who had been treated with painkillers and massage physiotherapy with poor results, and could not walk today, was pushed into the ward, and MRI showed L5-S1 disc prolapse. Consideration: The patient is currently suffering from a herniated disc at L5-S1, and the patient is old enough to undergo endoscopic removal of the herniated disc under local anesthesia. The surgical steps were as follows: 1. C-arm localization of the L5-S1 puncture site 2. localization followed by puncture and placement of a working trocar 3. endoscopic nucleus pulposus removal of the stained herniated disc 4. removal of the herniated disc 5. band-aid coverage of the 0.7 cm long incision The patient’s symptoms disappeared after surgery, and the MRI was reviewed at 1 year: no recurrence.