The microcatheter has a single-lumen structure and is mainly composed of the inner lumen of the catheter, the tip, the Markband, the outer layer of the catheter, the middle layer of the catheter, the stress support, and the catheter seat. The surface of the outer layer of the catheter is coated with a hydrophilic coating. An accessory shaping needle is included in the inner package of the microcatheter. Sterilized by ethylene oxide, single use. The shelf life is two years.