Varicose veins of the great saphenous vein are the longest superficial subcutaneous veins in the body. They start from the dorsal vein of the foot on the inner side of the dorsum of the foot, ascend on the inner side of the lower limbs, and reach the groin. Varicose veins of the lower limbs mostly occur on the inner side of the calf. In severe cases, they can extend upward to the inner side of the thigh, and even the whole lower limbs can see varicose veins in a tortuous mass. Varicose veins of the lower limbs of these patients mainly occur in the great saphenous vein and its branches, so it is called great saphenous varicose veins.

External ventricular drainage (EVD) is a common neurosurgery procedure in which the front end of the drainage tube is placed in the ventricle after ventricular puncture through the skull or during open circuit surgery to drain the effusion in the ventricle out of the body. It is mainly used to treat ventricular hemorrhage, hydrocephalus and other intracranial diseases, especially acute obstructive hydrocephalus, intracerebral hemorrhage into the ventricle, ventricular hemorrhage and other neurosurgical emergencies. It plays an important role in relieving brain hernia, draining blood and reducing intracranial pressure for patients. However, since the ventricular drainage tube is connected to the outside world, intracranial infection may occur. Once intracranial infection occurs, it will seriously prolong the patient's hospitalization time, increase the patient's hospitalization expenses, and even increase the patient's mortality and disability rate.

Disposable skin stapler is mainly used for skin suturing during surgery. Its function is to precisely align the skin tissue on both sides of the incision so that it can heal quickly and accurately. Compared with traditional manual suturing, disposable skin stapler has higher efficiency and better effect.

Anesthesia is an auxiliary means for doctors to use some anesthetic drugs or special methods to make a part of the patient's body, or the whole body, temporarily lose all sensation, so as to help doctors to carry out surgical operations smoothly. Anesthesia is simply a method of quickly and effectively controlling the patient's pain. By temporarily suppressing the painful part and the state of consciousness, the pain suffered by the patient during the operation is relieved, which is convenient for doctors to perform surgery or diagnostic examinations. Through anesthesia, patients can reduce their pain, create a safe, stable and comfortable medical environment, and keep patients in a stable state, so as to effectively cooperate with doctors to carry out related surgical treatments and improve the quality, efficiency and level of the overall operation.

With the continuous improvement of medical technology, the scope of clinical transfusion and component transfusion treatment is expanding, and people pay more attention to blood quality, transfusion efficacy and transfusion safety. Conventional transfusion mode is no longer suitable for clinical requirements. At present, various common blood and blood components contain a large number of leukocytes and inflammatory cytokines, which can often cause non-hemolytic fever and allogeneic immune reactions. The use of disposable leukocyte filters to remove leukocytes can reduce and avoid graft-versus-host disease and viral infection caused by transfusion, prevent or eliminate transfusion-related immunosuppression syndrome, reduce transfusion-related thrombocytopenia, prolong organ transplant rejection, and enhance the treatment effect of malignant tumors. The removal principle is that when leukocytes pass through the filter disc, they are removed by mechanical blocking and adsorption, while re