Method and apparatus for adjusting the amount or the partial pressures of two gases in a fluid

The invention relates to a method by which in a fluid, such as blood, the amount or partial pressure of a first gas, such as oxygen that can be absorbed by the fluid, and the amount or partial pressure of a second gas, such as carbon dioxide, which is can accumulate in the fluid can be guided to predetermined values ​​simultaneously. To adjust the amounts / of the partial pressures of the two gases, the fluid is at the one side (2) at least one permeable or semi-permeable release layer (1) and a process gas at the other side (3) conveyed past, wherein the process gas containing the first gas and in is able to receive the second gas. The process gas is conducted in a gas circuit (4). In the gas loop (4) is the process gas on the one hand supplied to the first gas, on the other hand, is the process gas, the amount of the second gas, which is about the at least one separating layer (1) passes out of the fluid into the process gas and absorbed by the process gas, (by means of an absorber unit 8) withdrawn.