What is scarless surgery and what are its advantages? Scarless surgery has two meanings: 1. it means no scar on the body; 2. it means no shadow left on the child’s mind. If the child has surgery at a very young age and without deep memories, and there is no scar after surgery, then the child may not know that he or she has had the disease and surgery when he or she grows up, and will not feel different. In this way, the initial intention of the patient’s parents will be achieved – “We hope that after the surgery, the After the disease is cured, it will be the same as if the surgery had never been done, the same as if the child had never had the disease, and the same as a healthy child”. How to do the surgery without scarring? With social progress and medical development, people’s demand for treatment of diseases is bound to increase, not only for cure, but also for less trauma and quicker recovery, not only for physical recovery, but also for minimal psychological impact. It is the increasing demand for health that directly contributes to the increasing level of medical treatment. As a result, pediatric laparoscopic techniques, a representative of minimally invasive treatment, have been rapidly developed. Pediatric laparoscopic technology has been applied to many fields of pediatric surgery. After consideration, based on the existing minimally invasive treatment, from the perspective of trying to meet the needs of patients, we propose “minimally invasive for major diseases and scarless for minor diseases”. Pediatric hiatal hernia and syringomyelia are two of the most common diseases in pediatric surgery and have a high morbidity rate. Traditional surgery is very traumatic, with incisions located in the groin bilaterally, about 3-4 cm long, which not only results in obvious postoperative scarring, but also easily destroys the blood flow of the spermatic cord and risks damaging the vas deferens. At present, the traditional laparoscopic technique mainly uses two holes in the abdominal cavity for operation. Although it has greater advantages compared with traditional surgery, there is still a small incision of 5mm in the abdomen except for the umbilical hole, which will leave a scar after healing. We all know that the incision made with a knife is scarred after healing, while the eye of the needle lanced during intravenous drip is scarless after healing, which means that if the incision is small enough to become the eye of a needle, it may heal without scar, however, the thinnest international operating forceps should be about 3mm, which will also leave a scar. Based on the requirement of excellence, we independently developed a laparoscopic-assisted needle device, which has been certified by the National Patent Office. The invention patent discloses a laparoscopic auxiliary needle device for treating pediatric hiatal hernia, including a 1mm diameter solid metal needle: its head end is trigeminal to facilitate penetration into the abdominal wall, but its tip is treated as bluntly rounded to avoid side injuries such as iliac vessels; its front end is rough and has two grooves on the side to facilitate drawing of sutures. This needle not only provides the necessary auxiliary operations for laparoscopic treatment of pediatric hiatal hernia, such as: pulling the peritoneum, pulling the vas deferens, and pulling the sutures, but also effectively probes for occult hernia. The application of this patent for minimally invasive surgery avoids the shortcomings of the currently used 3-5mm skin incision to place the operating forceps, making the surgery more minimally invasive, and for the 1mm needle hole, the body can achieve scarless healing, making the surgery improved from small scar to scarless, thus making the quantitative change in the length of the incision to a qualitative change of scarless after surgery.