This article is part of the supplement: 50th Annual Meeting of the Society for Research into Hydrocephalus and Spina Bifida .

Oral presentation

In-vitro tests of 123 adjustable valves (10 designs)

A Aschoff¹ , D Biedermann¹, J Ludwig¹, A El Tayeh¹, M Akbar² and B Hashemi³

¹  Department of Neurosurgery, University of Heidelberg, Im Neuenheimer Feld 400, Heidelberg, 69120 Germany

²  Department of Orthopedics, University of Heidelberg, Germany

³  Krankenhaus Singen, Germany

author email corresponding author email

from 50th Annual Meeting of the Society for Research into Hydrocephalus and Spina Bifida
Cambridge, UK. 30 August – 2 September 2006

Cerebrospinal Fluid Research 2006, 3(Suppl 1):S4doi:10.1186/1743-8454-3-S1-S4

Published:	21 December 2006

First paragraph (this article has no abstract)

Adjustable differential pressure valves (AV) have been inaugurated by Bush & Matson in the early fifties and Kuffer & Strub in 1969. More recently we overview 5 historical models and 13 concepts resp. prototypes; 12 different designs are on the market, using 6 basic constructions. In 1987 Loayza published the first clinical Sophy-report, we the first Medos-P-experiences in 1990. Especially in Europe the AVs are used in ca. 40% of all shunts, especially in children and NPH. In 1989 bench-tests were inaugurated by Richard and our group, followed by Trost, Schöner, Czsonyka, Eklund and others. The problematic electromagnetic safety of AVs – rarely thematized and underestimated in the early papers – found an increasing interest.