A common cause of cranial defects is when patients undergo debridement and decompression surgery due to trauma with brain hemorrhage. Patients generally need to undergo cranial repair after gradual recovery from surgery. Cranial repair is mainly because the brain is missing a piece of bone after surgery, which is not only very unattractive, but also worries about whether the brain will be damaged every time it is bumped. In addition, the intracranial pressure is unstable, and the vital activities in the skull may be disturbed, which may manifest as headache and dizziness. In addition, patients have fear of pulsation, expansion and collapse of the defect area, as well as fear of sunlight, fear of vibration and even fear of loud noises. It may also cause lack of concentration and memory loss, and some patients show depression, fatigue, reticence and low self-esteem. So it is still necessary to have cranial repair. In recent years, a team of neurosurgeons has performed a wide range of cranial bone repair procedures, including PEEK cranial bone repair for many patients with cranial defects, which has been praised by many post-operative patients and has yielded good results. Which materials are better for skull repair? Traditional titanium mesh has some drawbacks, including deformation and exposure of the mesh. Currently, PEEK (polyether ether ketone) is a new and ideal material for cranial bone repair, as its properties are very close to human bone and the cranial stress is intact after repair. It has low rejection and high stability. Simply put, this material is more “compatible” with body tissues and has no metallic cold or heat transfer reactions, effectively preventing intracranial temperature imbalance and not affecting future medical imaging, such as CT or MRI.