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Shunt audit: a computerized method for testing the performance characteristics of CSF shunts in vitro
H E Whitehouse1, M Czosnyka, J D Pickard
1Academic Neurosurgery Unit, Addenbrooke's Hospital, Cambridge, UK.
Summary
Shunt malfunction is common, with 81% failing within 12 years due to various factors. A new computerized rig evaluates shunt performance over time, revealing progressive changes in function during long-term in vitro testing.
Area of Science:
- Biomedical Engineering
- Neurosurgery
Background:
- Long-term shunt performance in vivo shows high failure rates (81% within 12 years).
- Shunt failure is multifactorial, involving patient, surgical technique, and device factors.
- Existing short-term testing methods reveal variability and deviations from manufacturer specifications.
Purpose of the Study:
- To develop and validate a computerized in vitro shunt rig for long-term performance evaluation.
- To assess shunt performance characteristics under controlled pressure-flow and flow-pressure conditions over extended periods.
Main Methods:
- Development of a computerized shunt rig with pressure transducers, electronic balance, and computer-controlled pumps.
- Utilizing pressure-flow and flow-pressure studies to evaluate shunt performance.
- Employing an IBM PC for device control and performance characteristic evaluation.
Main Results:
- The computerized rig enables long-term in vitro evaluation of shunt performance.
- Initial observations confirm progressive changes in shunt function over weeks of testing.
- The system allows for detailed analysis of shunt behavior under various simulated conditions.
Conclusions:
- The developed computerized shunt rig provides a reliable method for long-term in vitro performance assessment.
- This technology can identify progressive shunt dysfunction, potentially improving device reliability and patient outcomes.
- Further studies are warranted to correlate in vitro findings with in vivo shunt performance.