Post marketing surveillance on medical implants in neurosurgery.

Neurosurgeons deal with the most vulnerable human organ, the central and peripheral nervous system (CNS and PNS): the brain and its efferent and afferent neural structures (spinal cord), and peripheral nerves. Also, the CNS blood vessel system as well as the CNS surrounding structures, like the membranes covering the CNS tissue and the bony elements enveloping the CNS (skull and spinal column), belong to the neurosurgeon's field of work. The very precarious character of the neurosurgeon's thinking and handling is mainly determined by a poor reversibility of lost neurological functions due to his intervention. However, this is not always an unwanted consequence of his handling but sometimes done intentionally. Neurosurgical activities focus on both congenital and acquired anomalies, like: