1. The full name of dilator is skin dilator, which is an advanced treatment method unique to plastic surgery, and it is different from the skin grafting operation of "robbing Peter to pay Paul". It is mainly composed of three parts: shell, catheter and injection seat. Its shapes are round, oval, kidney-shaped, half-moon, rectangular, cylindrical and so on, and its volume ranges from tens of milliliters to hundreds of milliliters.

2. The skin retractor has two hook teeth, and each hook tooth is rotatably connected with the retractor body, and a movable adjusting ring is arranged around the two hook teeth.