=====Spitz-Holter Valve=====
The first working [[ventriculoperitoneal shunt]] from the 1950s developed by [[John Holter]] and [[Eugene Bernard Spitz]].
((Boockvar JA, Loudon W, Sutton LN. Development of the Spitz-Holter valve in
Philadelphia. J Neurosurg. 2001 Jul;95(1):145-7. PubMed PMID: 11453388.)).
It is a common [[procedure]] for [[hydrocephalus]] treatment