LP shunts and pseudotumor cerebri?

I have pseudotumor cerebri and in December 2004 they put in a LP shunt and a head tap thing (that can use a syringe device to remove CSF fluid to measure the pressure) what is the scientific name of the head tap, the surgery called that was used to put it in, and how often should the shunt be checked out, and why?
Update: The LP shunt is one that goes from the spine to the abdomen. The head tap replaces spinal taps but is located in the head. Can anyone provide more info?
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