The pressure drops across some of the MSE system cannulae are shown below. The values are comparable with those found in many modern, inflow cannulae.
During VV-ECMO, the cannula model takes into account the relative positions of the tips of the drainage and return cannula(e). If these are positioned too closely, re-circulation will start to occur and oxygenation will be impaired.
Return cannula size can be set by the trainee in the range 15 - 24F using the 'Cannula Selector Interface'.
The effect of changing the size of the return cannula on pre-membrane pressure (at a flow rate of 4 lpm) is shown below.
