The presence of one, two or three radio-opaque dots, or alternatively, the absence of a dot, to the left of the inlet connector, gives the pressure range of the valve, both visually or radiographically:
No dot: Nominal maximum pressure of 140 mm H2O;
One dot: Nominal maximum pressure of 200 mm H2O;
Two dots: Nominal maximum pressure of 300 mm H2O;
Three dots: Nominal maximum pressure of 400 mm H2O.
The operating pressure range for each Sophy® or Polaris® valve is detailed on the accompanying Patient Identification Card, in accordance with the model of the implanted valve.
Print this page