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Management of a locked Strata valve
Kelly J Bullivant1, Alim P Mitha, Mark G Hamilton
1Division of Neurosurgery, Foothills Medical Centre and Alberta Children's Hospital, University of Calgary, Calgary, Alberta, Canada.
Journal of Neurosurgery. Pediatrics
|April 3, 2009
Summary
The PS Medical Strata valve, used for hydrocephalus, can malfunction if its rotor locks. This rare issue affects only first-generation valves and may require reprogramming after MRI scans.
Area of Science:
- Neurosurgery
- Biomedical Engineering
- Medical Devices
Background:
- Hydrocephalus treatment often involves programmable shunt valves.
- The PS Medical Strata valve allows noninvasive pressure adjustments via magnetic fields.
- Sensitivity to magnetic fields necessitates frequent reprogramming, especially after MRI.
Observation:
- The Strata valve's rotor can become locked, leading to shunt malfunction.
- This specific complication is a known but rare occurrence.
- The rotor lock complication is exclusive to first-generation Strata valves.
Findings:
- First-generation PS Medical Strata valves are susceptible to rotor lock.
- Magnetic field interactions, such as from MRI, can potentially trigger this malfunction.
- Shunt reprogramming is a common post-MRI procedure for Strata valves.
Implications:
- Awareness of this complication is crucial for neurosurgeons and patients with first-generation Strata valves.
- Further research may be needed to understand the mechanism of rotor lock.
- Potential design improvements for future valve generations could mitigate this risk.
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