Tracer for raising detection rate of sentinel lymph node of breast cancer and preparation method thereof

The invention relates to a tracer for raising detection rate of sentinel lymph node of breast cancer and a preparation method of the preparation. The tracer is prepared as follows: 1ml 1% of methylthioninium chloride injection and 2.5ml 2% lidocaine hydrochloride injection are extracted by the use of a syringe; and normal saline is added to reach 5 ml so as to prepare a compound injection containing 0.2% methylene blue and 1% of lidocaine. A syringe is used to inject the prepared tracer in a point-like form under the skin around mammary areola of a patient's breast, and the total dosage of the tracer is 2ml to 4ml. Then, along the dilated blue-stained lymphatic vessels, all blue-stained lymph nodes are taken out to be inspected. The method has advantages of low cost, easy acquisition, no radiation, no requirement of special instrument detection and the like. By the method, detection rate of sentinel lymph node is raised, and cutaneous necrosis caused by methylene blue is avoided. The method is worth of popularization and application in various hospitals.