 The old scalp incision was opened with a Colorado needle tip and the old catheter was identified as we took the Colorado needle tip over the existing ventricular catheter, right over the sleeve on top of it and when that was entered, the CSF poured out around the ventricular catheter. 
The old scalp incision was opened with a Colorado needle tip and the old catheter was identified as we took the Colorado needle tip over the existing ventricular catheter , right over the sleeve on top of it and when that was entered , the CSF poured out around the ventricular catheter .