Hello and welcome to Neuro Talk, if I may ask this shunt as put in for? Hydrocephalus? if so here is a link to that forum, which may be a help in getting a better answer, to an important question.

http://neurotalk.psychcentral.com/forum14.html

Do not hesitate in posting folks around here are so helpful and kind. If you need any help just message me. I hope this helps some, if not here is the link to the main index page so you can dig deeper

http://neurotalk.psychcentral.com/index.php

again welcome to NT