paediGAV ® Pressure setting

The paediGAV is available in six different pressure configurations. It is MRI-conditional and calibrated in accordance with strict quality control standards.

Standardopening pressure
horizontal position
(cmH2O)
opening pressure
vertical position
(cmH2O)
children up to 6 months of age 424
children from 6 months of age up to 5 years of age924
children over 5 years of age 929

Reading the pressure setting from an X-ray image

Every single pressure configuration is individually coded and can be identified on the paediGAV in an X-ray image post-operatively. The picture below shows the X-ray image of a paediGAV (9/24 cmH2O).

The paediGAV is available in the following pressure settings:

opening pressure horizontal / vertical (cmH2O)coding paediGAV in X-ray imagecoding old paediGAV (with distal catheter) in radiograph
4/14
4/19
4/24
9/19
9/24
9/29

Opening pressure (OP) of paediGAV

The opening pressure of the paediGAV depends on the individual patient's posture. The ball-cone unit determines the pressure level in the horizontal body position. The opening pressure in the vertical body position is the sum of the opening pressures of both the ball-cone and gravitational units. The valve adjusts for body positions at all possible angles of elevation and the opening pressure can be calculated as follows:

Opening valve pressure= sphere-spring unit + sin (angle) x gravitational unit

Example - calculating the opening pressure in different body positions: 
paediGAV 4/24 cmH2O:

Horizontal position: only the ball-cone unit influences the opening pressure. 4 cmH2O

Vertical position: effect of graviational unit is highest at this point
4 + 20 = 24 cmH2O

Inclined at 45°: the effect of the graviational unit depends on the body position 4 + sin 45° x 20 = 18 cmH2O