A Rare Case of Shunt Malfunction Due to the Needle Guard Coming Off During Ventriculoperitoneal Shunt Surgery.

We report a rare case of shunt valve failure due to obstruction during ventriculoperitoneal (VP) shunt surgery for hydrocephalus after subarachnoid hemorrhage due to aneurysm rupture. The hydrocephalus shunt surgery was started normally, and there was no bending or twisting of the valve, nor blood contamination. However, after irrigation of the shunt valve, the shunt valve obstructed and malfunctioned before catheter connection and insertion into the subcutaneous space. Shunt valves are rarely damaged during surgery. In this case, the cause of the malfunction could not be identified during surgery, and it was necessary to use a shunt valve made by another company for patient safety. The surgery was completed without incident, but the cause of the obstruction, which was discovered after surgery, was that the needle guard inside the valve had come off from the bottom. The CODMAN CERTAS Plus Programmable Valve (CCPPV) in particular has excellent functionality, but the regular type needle guard is attached to the bottom of the valve pump. Therefore, it cannot withstand the handling during surgery that other valves tolerate. In the future, improvements in medical equipment and more careful operation of shunt valves by surgeons are required for risk management during surgery.