For replacing the defect caused by小煙 a trauma or a surgical operation, ar年機tificial dura substitute is t快工o prevent such compl時匠ications as Cerebrospina雪外l fluid leakage, adhesion and epilepsy,小腦 etc. both two faces are smooth surface藍間 with the materials of 事懂expanded polytetrafluo音票roethylene(e-PTFE).