medical implants consisting of artificial materials, namely, bone fixation devices being metal screws and plates for medical use, medical drill bits for cutting bone, connections in the nature of holders used for joining and fixing of hydrocephalus shunt catheters, and silicon tubing used for medical purposes for drainage; implantable cranial bone fixation devices in the nature of metal clips, plates and screws that are implantable in the skull for medical use; medical apparatus and medical implants for cranial bone replacement and bone plating, namely, implantable plates made of artificial matter; cranial implants consisting of artificial materials; and artificial dura maters for human beings, namely, artificial biomaterials for augmentation of tissue for medical purposes