The Gravity Compensating Accessory (GCA) is designed to be mounted in line with the DP valve or any other differential pressure valve system in order to counteract the siphoning effect of hydrostatic pressure when the patient is in the upright position.
- Can be used in all cases where an anti-siphon device is deemed necessary
- Its operating characteristics are not dependent on its location along the shunt distal tubing
- Not sensitive to external pressure
Only available in the United States
The GCA is an integral component of the H-V Lumbar Valve System. A sample set of H-V Lumbar valves was pressure tested at different flow rates (60, 50, 30, 20, 10 & 5 ml/h) before being subjected to two MRI sequences*. The products were tested again after MRI exposure.
Additional H-V Lumbar valves were subjected to an MRI magnetic field of 1.5 Tesla. The results of the tests indicated that exposure to MRI does not affect the pressure settings of the valves. No significant forces or temperature changes were noticed during MRI exposure.
*T1 sequence, 2’05’’, 800 ms repetition time, 12 ms echo, 1.5 Tesla field.
T2 sequence, 2’34’’, 3500 ms repetition time, 120 ms echo, 1.5 Tesla field.
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