... surgery Patients in the prone position when applied to patients with the same product at the top jaw and forehead concave contact, ... ,getting ride of the ressure sore and neural injury2. Enhancing the stability of body fix in operation3. The products adopted macromolecule ... ,wearproof,shock-attenuation,pollution-free and easy to clean.4. Reusable,soft material,and the same as human body parenchyma, ...