I have never heard of this type of shunt. My son has a reprogrammable Strata valve shunt. It is remarkable. When he first got it, and say it was over draining or under draining, we could simply go into the dr's office and they would just change the settings. It has 5 different settings. Once the fluid was prety much drained, we are down to the onw of the lower settings to maintain the fluid. He had a ruptured arachnoid cyst on the left side of his brain. Have you heard or considered this??