To date, the main parameter characterizing ECMO membrane's performance is the oxygen and carbon dioxide transfer rate, 𝑁 (mol/s), within the oxygenator. 𝑁 is directly proportional to the mass transfer coefficient, 𝐾 (mol/m 2 s Pa), to the gas exchange surface area 𝐴 (m 2 ), and to the driving force of gas exchange i.e., the difference in gas partial pressures: